m AT' i INST OF STAND & TECH

AlllOb DfiE^bl P

NIST

PUBLICATIONS

IM6S1R 83-2742

Photonuciear Data - Abstract Sheets

1955 - 1982

Volume V (Flourine - Magnesium)

U S. DEPARTMENT OF COMMERCE

,National Bureau cf Standards

National Measurement laboratory

Canter f or Radiation Research

Washington. DC 20234

Ma*cn 1 S34

U.3. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
I
NBSIR 83-2742

PHOTONUCLEAR DATA - ABSTRACT SHEETS

1955 - 1982

VOLUME V (FLOURINE - MAGNESIUM)

E. G. Fuller, Henry Gerstenberg

U S DEPARTMENT OF COMMERCE

National Bureau of Standards

National Measurement Laboratory

Center for Radiation Research

Washington, DC 20234

March 1 984

U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director

TABLE OF CONTENTS

Table of Contents i

Introduction 1

Fluorine (A=17) 3

Fluorine (A=18) 11

Fluorine (A=19) 17

Fluorine (A=20) 101

Neon (Natural) 105

Neon ( A=20) 119

Neon ( A=22) 149

Sodium ( A=21) 167

Sodium (A=22) 173

Sodium ( A=23) 179

Magnesium (Natural) 241

Magnesium (A=24) 275

Magnesium (A=25) 363

Magnesium (A=26) 387

Definition of Abbreviations and Symbols 425

Photonuclear Data-Abstract Sheets

1955-1982

I. Introduction

As used in connection with this collection of data-abstract sheets, the term

photonuclear data is taken to mean any data leading to information on the electromagnetic matri x element between the ground state and exci ted states of a given nuclide.

The most common types of reactions included in this compilation are: (e,e‘), (y,y),

(y ,y ' ), (y,n), (y,p), etc. as well as ground-state particle capture reactions, e.g.

(a,y 0). Two reactions which fit the matrix element criterion are not included in

the compilation because of their rather special nature. These are heavy particle

Coulomb excitation and the thermal neutron capture reaction (n,y 0

) . While the energy

region of particular interest extends from 0 to 150 MeV , papers are indexed which

report measurements in the region from 150 MeV to 4 GeV. Most of the experiments

listed are concerned with the excitation energy range from 8 to 30 MeV, the region

of the photonuclear giant resonance.

The hierarchical grouping of the photonuclear data-abstract sheets wi thin the fi le

is by: 1. Target Element, 2. Target Isotope, and 3. by the Bibliographic

Reference Code assigned to the paper from which the data on the sheet were abstracted.

In this file, colored pages are used to mark the beginning and end of the sheets for

each chemical element. A brief historical sketch of the element is given on the divider

sheet marking the start of each section; the information for this sketch was derived

from references such as the Encycl opaedi a Bri tanni ca. In those cases where the sheets

for a given element make up a major part of a volume, colored pages are also used to

delineate sections pertaining to the individual isotopes of the element. Each of the

sections of the file, as delineated by two colored divider sheets, represents a 27 year

history of the study of electromagneti c interactions in either a specific nuclide or a specifc element.

The data-abstract sheets are filed under the element and/or isotope in which the

ground-state el ectromagneti c transi ti on takes place. For example, the abstract sheet

for a total neutron yield measurement for a naturally occurring copper sample would

appear in the elemental section of the copper file. On the other hand, a measurement

of the 62!Cu 9.73 minute positron activity produced in the same sample by photons

with energies below the three-neutron separation energy for 65g u (28.68 MeV) would

be filed with the sheets for Similarly a measurement of the ground-state

neutron capture cross section in would be filed under while the correspond!* ng

ground-state alpha-particle capture cross section would be filed under

At the end of this volume there is a master list of the abbreviations that have

been used in the index section of the abstract sheets. The listings are those used

in the final published index, Photonuclear Data Index, 1973-1981 , NBSIR 82-2543,

i ssued i n August 1982 by the U . S . Department of Commerce, National Bureau of Standards,

Washi ngton, DC 20234. In some cases two notations are entered for the same quantity.

The second entry is the abbreviation that was used in one or more of the earlier

published editions of the index.

1
IIIIIII
F

A= 17

FLUORINE

Z=9

Fluorine is the most reactive of all known chemical elements; this

property hindered its original preparation and makes its handling even difficult today. This extreme reactivity brought agony and death to some

of the pioneer investigators.

Georgius Agricola (1494-1555), a German scholar and man of science,

wrote in his first mi neral ogi cal work Bermannus (1530), that fluorspar was used as a flux in metal smelting; the stones melted in the heat of the

fire and caused the material in the fire to become more fluid. In 1670,

Heinrich Schwanhard of Nuremberg treated the mineral with strong acids and

discovered he could etch glass with the solution. He was a member of a family of glass cutters and raised the etching process to a high art by

making scenes, in relief on glass, for Emperor Charles II. Scheele did

extensive investigations of fluorspar and published papers in 1780 and

1786 claiming that fluorspar contained a peculiar acid; he called it

"fluoric" (from the Latin "fluo", flow). This new acid immediately

aroused widespread interest. Sir Humphry Davy ( 1778) -1829 ) and A. -M.

Ampere (1775-1836) recognized in 1813 that the acid must be a compound of

hydrogen and an unknown element for which the name "fluorine" was suggested by Ampere. Davy made numerous attempts to isolate the element

and it was not until 1886 that Henri Moissan (1852-1907), made a successful preoaration. This method used a platinum cell with platinum

electrodes but the weight loss of the platinum exceeded the weight of the

fluorine produced! The problem of making fluorine on a large scale was

not solved until after 1939 when uranium hexafluoride became needed as part of the atomic energy program.

F

A= 17

3

F

A= 1

7
pppppp 4 p
R.E. Segel, P.P. Singh, R.G. Allas, S. S. Hanna

Phys. Rev. Letters _10, 3^5 ( 1963 )

Elem. Sym.

17

Method Van de Graff; Nal

Ref. No.

63 Se 1 JHH

Reaction E or AE crd E J n

- Notes

0

16

(p,y) E =

P3.4-3.

5

E = Po

3.473

EYo"

3.86

rY

=

0. 11±0.02

eV

5/2'

This r gives a radiative lifetime

of (0.6±0. 1) 10

-ll+ sec.

(MmV) 4b * 4. IMTJ t.UM.n 0.47 M.M .." -13 i.m MM «4*eajt ., —ajB a.m—ar- j |

1 r 1 r-1 0*(B. y

T

3.473 MEV

0

• • • ' i ; "T" r

i_ 0 (a.ylF .* 0 (a.a.y)N a —

^

£,• 3.473 M*v

-j 9- O'

I * -a

* # 1" A • . V

*. .J

-j

•

. J

*

1

1 1 I 1 1

( u

3o r : 0 U

1 . 9 , |KiV|

X 41-

<n

a r

of 2-. • • 9*

f

1 a 1 “mvT

3.4 3.470e.

3.473 3*M

30 IOO ISO CHiNNCL MUM BCR

FIG. 1. N«J puiaa-hatgb* spectrum for radiation emitted at 0" In proton bombardment l£p*3.473 MeVO

ai a tantalum oxide targat. Tbe uarp i* 3.94 MaV

for the resonant capture rutlartai

‘ I i

FIG. 2. Otflerantlal yield (0.901 for 0

1, (p,y)F 1T for two tantalum oxide targets of different thickness. Each point gfraa tba total count In the channels corresponding to tbe 3.M-HsV peak: no background has been

subtracted. Well below resonance the actual yield of 3.86-MaV radiation la leas than 9.1 times the on- reso- nance .alas. The resonant energy la taken equal to 3. 4TB* MBIT. TSa irieai indicate point* at watch anga90* 9

I3S* 180*

FIG. ' angular distributions measured with che target used in the tower part of Fig. 1. The distributions

are normalized to unity at JO*. The indicated errors

are statistical. The curves drawn are baaed on the coefficients of Table 1.

—O PM NBS-418

IS- 1 -S 3 I USCOMM-OC 18SSS-PS3

U J. DEPARTMENT OF COMMERC*

NATIONAL BUREAU OF STANDARDS

PHOTOHUCL EAH DATA MEET 5
i

m
ref. H. C. Chow, G. M. Griffiths, T. H. Hall

Can. J. Phys. 53_, 1672 (1975)

ELEM. SYM.

17

method REF. NO.

75 Ch 1 hmg

REACTION RESUL T EXCITATION SOURCE OETECTOR

ENERGY type R AN CE TYPE RANGE

ANGLE

P,G ABX 1- 3 D 0-2 SCD-D DST

(.8 - 2.4) (.4 - 2.0)

O.KDh

(d)

Fig. 6. The angular distributions of the lsOfp,7) |T F gamma rays at three energies. The experimental points have been normalized to give the best fit to the smoothed

theoretical cross section.

.3 - 2.4 MEV

Fig. 7. i6 0(p,y) i7 F differential capture cross section

at 90° for transitions to the 1/2* first excited state (y 2 ) and 5/2* ground state (y,). The experimental cross sections have been normalized to the proton elastic scattering cross section. The solid curves are the theoretical cross sections.

Fig. 8.

l<s Ofp,Y)* 7 F total cross section. The solid curve is the theoretical cross section. Data points above

1 MeV are from the present work; those between 250 and 600 keV are from Tanner (1959); and those below

200 keV are from Hester et al. (1958). (over)

H0T0NUCLEAR DATA SHEET 6

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANOAROS
Table 4. 90° differential and total cross sections for proton capture to the ground state

(Yi) and first excited state of 17 F

Mean CM

energy (MeV)

Yi Yj da/dn (90°) (pb/sr) a

Gib) da/dfl (90°) (pb/sr) a

(4b)

0.795 0.086 ± 0.004 0.73 ± 0.04

1.024 0.212 ± 0.011 1.78 ± 0.09

1.029 0.195 ± 0.007 1.64 ± 0.06

1.288 0.046 ± 0.005 0.69 ± 0.08 0.337 + 0.010 2.83 ± 0.08

1.572 0.066 ± 0.006 1.01 ± 0.09 0.521 + 0.025 4.36 ± 0.21 1.836 0.096 ± 0.006 1.52 + 0.10 0.628 ± 0.020 5.27 ± 0.17 2.404 0.164 ± 0.008 2.66 ± 0.13 0.940 ± 0.030 7.88 ± 0.25

7
ref. c.t» c.M . j rM. M.N. Harakeh, P. Paul, and Ph. Gorodetzky

Phys. Rev. Cll , 1008 (1975)

17

METHOD REF. NO.

75 Ha 5 hmg

reaction RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

P,G ABX 15- 31 D 15- 32 NAI-D DST

FIG. 3. Excitation curve for the summed transitions

To *Tf The solid line is dra in through the data to guide

the eye. Arrows indicate energies where angular distributions were taken.

S(deq) S(deg)

Ex^RMeV

16.0 22.0

1 1 ' T

Ep(MeV)

FIG. 4. .Angular distributions of the y0 +y, yield at 17.14, 18.15, 20.98, and 22.19 MeV, i.e., the energies indicated by arrows in Fig. 3. Solid curves are fits with Legendre polynomials up to and including P•, terms. The normalized

Legendre coefficients a 2

, and a 3 obtained from the fits are plotted on the right-hand side of the figure.

POQM N3S-418

(R EV. 7-1 4- 44

)

OSCOMM-OC £00 1 0- P« 4 PH0T0NUCLEAR DATA SHEET 8

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
TABLE IV. Summary of theoretical and experimental results.

General rules lp and 2p-lh calc. 1 Exp.

cr 0 = JudE = 60 NZ/A cr 0 (7 = i) = 129 <7,)(y.A:)> (MeV mb) 254 o-0 (T = |)=221

cr0 (total) = 350 £10.2

cr.| = Ju/EdE = 0.36A4/3 cr_[(T = 2 ) = 6.0 (mb) 15.7 <7. 1 (7 = 5) = 8.9

ff-^total) = 14.9

<7-t (r*i)/<r_, 0.60 b 0.59 c 0.60

EQDR = (T 0 /l7 -l £r, 1/2 = 21.4(20.4) Et- !/2 = 22. 0(15.4 — 30.4 MeV)

(MeV)

- ^r-3/: — ^r=i/2 = £/ ( 2 r, -1)M

&T- 1/2 = 24.8 £r=1 (i?0) = 22.4(16.3 -29 MeV) d

(MeV) = 5.3 (L'= GO MeV) e = 1.8 (£/» 20 MeV) ' 3. 4(4. 4) —C/ = 39 MeV

1 Numbers in this column are from case I calculation except for numbers in parenthesis, which are from case II. h See Ref. 17.

c See Ref. 13.

d Calculated from experimental data of Refs. 7 and «. c See Ref. 2.

' See Ref. 3.

^R.O. Akyuz and S. Fallieros, Phys. Rev. Lett. 27_, 1016 (1971).

8 Renzo Leonardi, Phys. Rev. Lett. 28_, 836 (1972).

7 W.J. O'Connell, Ph.D. Thesis, Stanford Univ. 1970

(unpublished)

.

8 N.W. Tanner et al . , Nucl . Phys. 52_, 45 (1964).

L7

S. Fallieros and B. Goulard, Nucl. Phys. A147 , 593 (1970).

18

E. Hayward, B.F. Gibson, J.S. O'Connell, Phys. Rev. 05, 846 (1972).
*ef. F.M. Khan, J. Lowe, J.M. Nelson, A.R. Barnett

Nucl . Phys. A322 , 33 (1979)

CL CM. SYM.

17

METHOO REF. NO.

79 Kh 7 hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE NANCE TYPE RANGE P,G RLY 12,15 C 12-15 NAI-D 90

(12.550,14.17' )

.bstract: Measurements have been made of some parameters of thesecond and sixth T = j slates in

17 F. BRANCHING RATIO, SPIT

For the second state, the resonance energy was found to be Ev = 12.707 + 0.001 MeV ' " ~

(£ » 12.550 + 0.001 MeV). which agrees with and improves on the accuracy of earlier work. For

the sixth r = J state, at E, = 14.435 MeV. they-decay was determined to be predominantly y0 with

a branch to the first excited state of r(y,)/r(y0) § 0.14. Together with other work, this determines J’ to be j". The capture strength is found to be (22+ l)fJTJf = 1 1.4+2.6 eV.

NUCLEAR REACTIONS “CXp. y). E = 12-15 MeV; measured 17 F deduced

Erm- !*' capture strength.

Fig. 2. Gamma yield for T = 4 resonances in “0(p. y0

)‘

7 F and IJ C(p, y0

)‘ J N as a function of proton

energy at the target centre.

N3S-4I8

P £ V . I 4.64) -SC 3mm. O C 2«CtQ.P64

U.S. 0EPARTM6NT0F COMM^PC;

NATIONAL BUREAU 0 + 5TAMG4n;s PHOTONUCLEAR DATA SHEET 10
*
n
mmmmaamm
REF. C.M . o fM. R. G. Couch, H. Spinka, T. A. Tombrello,

Nucl. Phys. A175 , 300 (1971)

METHOO

T.A* Weaver

18

REF. NO.

71 Co 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE A,G ABX 4-5 D 0-2 ACT -I 4 PI

Table 1 Summary of ,4 N(s,x) l, F results

E, (MeV)

£, (MeV)

J

w

; r (2y+i)ra r.,reV(Ub)

Present experiment Parker *

0.310 4.656 **; i < 2X10-*

0.417 4.739 0»; I forbidden by selection rules 0.559 4.849 I; 0 2.79 =0.5xl0-*

0.698 4.957 2*; 1 < 0.5 x 10 -4

1.140 5.301 1 *, 2. 3, 4* ; 0 0.108 — 0.015 0.084 — 0.004

I.39J 5.501 0.027 - 0.003

1.532 5.607 (|-;0) 4.80 -0.40

1.619 5.674 <|-;0) 1.35 —0.15

•Ref.*). - P. D. Parker, Phys. Rev. 173 (1968) 1021.

PORM N3S-4 18

kR EV. 7-1 4-«4> USCOMM-OC 26010-P64 PHOTOHUCLEAR DATA SHEET 13

U.S. DEPARTMENT OF COMMERC

NATIONAL BUREAU OF STANOARC
1!J

mHmmm
J. G. Sens, A. Pape and R. Armbruster

Nucl. Phys. A199 . 241 (1973)

REF. ELEM. SYM. A Z

F 18 9

methoo REF. NO.

73 Se 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

P,G LPT 6- 7 D 0-1 KAI-D oar

6. 14 ME? LEVEL

Table 1 Electromagnetic decay properties for observed 18 F levels

Transition E, — E( J,” - J," ^2 Ax A ^71 l«l* (MeV) (meV) (W.u.) )

6.10 — 1.12 4- -5* 0.03 ±0.07 0.09 ±0.09 0.1 8 ±0.1

1

14± 11 >) /(El)

l (M2)

(0.23 ±0.18) :< I0* 3 g 3 o t r>»

\fi> O 4- -2" 0.31 ±0.12 0.04±0.15 -0.07 ±0.11 6± 5 •) (E2) 2.5 ±1.9

6.14 — 0 0* — l* 0.01 ±0.03 0.05 ±0.04 0 ^ 400 ±120 (Ml) § 0.08 ±0.02

6.14 — 1.70 0* — 1 * 0.12x0.12 0.12x0.19 0 g 74 ± 8 (Ml) S 0.04±0.004 6.14-3.72 0* — 1* 0.05 ±0.08 0.10±0.ll 0 S 270 ± 80 (Ml) ^ 0.9 x0.3

6.16 — 0.94 — 0=) 3* — 3* — 1* 0.27 ±0.07 —0.04±0. 10 I60± 50 (Ml) (5.3 Tf;*) X 10- 2

6.24 —2.10 4

) 3* —2- —0.20±0.02 -0.01 ±0.05 -0.06 ±0.02 I900±860 )

!(M1)

\(E2)

1.3 ±0.6

2.1 ±1.7

6.24 — 2.10 3” - 2- 0.06 ±0.05 0.06x0.06 I900±860 *) 6.24 — 3.79 3- -(3-) 0.04 ±0.11 0.09 ±0.1

8

300 ±140 •)

6.28 -0.94 -0=) 2* — 3* — i* -0.1 3 ±0.08 -0.01 ±0.10 0.06 ±0.04 350 ±120

/(Ml)

\(E2)

(0. 1! ±0.04)

0. 1 2 ±0. 1

2

6.39 — 0.94 2,3- -3* 0.26±0.06 -0.05 ±0.09

6.65 —0.94 2-3* 0.00 ±0.05 -0.01 ±0.08 I10± 55')

6.65 - 2.10 2-2* -0.08 ±0.03 -0.06 ±0.04 640±3l0 f ) 6.65 — .3.13 2 - r 0. II ±0.07 0.06±0.09 I40± 70')

6.78 - 0.94 4* - 3* 0.08 ±0.1

2

O.I8±O.I5 -0.13*0.11 1 1 ± 4

1 (MI

)

1(E2)

(2.6 ±0.9) x 10“ 1

-t 0.03

6.78 — 1.12 4* —5* 0.50 ±0.10 0.02 ±0.1

2

-1.1 ±0.3 29 x 10 !(M1)

\(E2)

(3.3 ± 1 .6) X 10" 3

1.2 ±0.5

6.78 —4.65 4* — 4* 0.29±0.05 -0.05 ±0.08 -0.3 ±0.2 35± 12 (Ml)

UE2)

0.16x0.06 < 80

6.87 — 0.94 3, 4, 5-3* -0.1 ±0.2 « 0.7 =0.3 6.87 -4.65 3,4.5 -4* 0.1 9 ±0.05 0.06±0.06

Angular distribution data A, are frora the ,7 0(p,y) l, F reaction, and in the case of one transition from the 6.24 MeV level, from the l4 N(a,y)“F

reaction. The energy shifts as functions of angle for the transitions from ail of the resonant levels showed full Doppler shifts. ) |Af|* =» r„jr* with R„ - 1.2 fm.

») The value used, = 21 ±16 meV, was calculated from the present strength, Brown’s a-strength '*), and Fa from Silverstein ll

). Berka 7

) gives r = 66x21 meV. •') Angular correlation. 4

) From the ,4N(*.y) ,, F reaction. •) Using T, as 1 keV±30% given by Silverstein **).

'] With r3rjr = 0.58 ±0.20 «v deduced from Phillips l0

).

7

1- Berka ec al. , Bull. Am. Phys. Soc. 510 (1971).

18

B. A. Silverstein et al. , Phys. Rev. 124 . 868 (1961).

‘ 9

R. B. Brown, Phys. Rev. 125 , 347 (196 2).

20

W. R. Phillips, Phys. Rev. 110 . 1408 (1958).

(over)

e o pm H3S-418

R EV. 7-1 A. 64) USCOMM-N 9S-OC PHOTOHUCLEAR DATA SHEET 14

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OP STANDARDS
E.

(W«V) 1345 1275

1245

1101 1010 93 2 028

74 8 718

(590) 574 590

565

521

0*p

E. (MaVikaV)

5.871 2

5.808 *3 6.779 ± 2 6.647 * 2 6.557 6483 £ 3 6.385 t 3 5.309 £ 2 6.280 £ 2

6.257 6239 i 2 6151 £ 2 6.135 £ 2 6.095 * 2

6785 6674

6607 6599

6501

6301

4.965 i 2 4.649

4.739 4.850 £ 2 4.402

4.361 4.229

4.119 3836

3.787 3.724 3357 3133 i 2 -32- 3050

25231

2.10131 05

1.70031 1.0 -

1.12101 03

1.081

~T'2 £3 —

|

1 1 r- 98£3 —

.1.

-12

i

'

1

I

1

1* J _ T :i1 1 —70t4 —

1

1 T*

54.. t £5- -28

J_ 0-2

-1C

1

__ T

i 5 —

-5

-3

, 1 ;+‘1—2 T-74—2

1

I 1

! ! , -f-H

-1C

-1C

-1C30 -J

>

v

3,4,5

(2.3) —

4~

2W;(1)

• 5“

2.3"

• 42.3)-

2*-,1

T*

-

3",1

3*-,T 0* .1 4*

r,t

r.T

(4*)

4“

2*,T

t0*.T

4*;1 > 2

2,3 2(31-

2 "

(3")

1**

( 3)*

1*2*1

7 +

2*

1*5*0*0*1

3*

19 F ,

Fig. 2. Energy levels and /-decay of ia F. The uncertainty in Evis 2 keV. Where an uncertainty is given for £, this was determined from our observed y-ray cascades. The figure includes all reported narrow levels. The J

n of the £, = 5.30, 6.14 and 6.56 MeV levels are from refs. J6 - a

). The level at 6.27 MeV was not seen in (p,y). Its J" is from ref. 1 a

). Since the £, = 6.56 MeV level was very weakly

excited in the (p, y) reaction, it was not possible to establish a decay scheme. The information on the E

,

= 5.61 and 5.67 MeV doublet are from ref. 37

). AJI other data below £, = 6 MeV are taken from ref. J5

).

g

G. Rolfs et al. , Bull. Am. Phys.Soc. L5, 782 (1970).

^F. Aj zenberg-Selove, Nucl.Fhys. A190 (1972) 1. ^C. Rolfs et al. , Bull. Am. Fhys. Soc. 16 , 510 (1971).

37

E. K. Warburton et al. , Isospln in nuclear physics,

ed. D.H. Wilkinson (North-Holland, Amsterdam, 1969)

p. 223.

15
E. Bellptto. E. Fiorini, P. Negri, L. Zanotti

II Nuovo Cimento 47A, 106 (1978)

REF. EL EM. SYM. A Z

METHOD

F 18 9

REF. NO.

78 Be 16 hg

REACTION EXCITATION ENERGY

SOURCE OETECTOR

RESULT

TYPE RANGE TYPE RANGE angle

A,G LFT 6 D 2 SCD-D 90

(6.138) (2.215)

Summary. — An experiment on the l *X(a, y)'*F reaction leading to tlic parity- and i.sospin- forbidden 0+ level at G.138 3fcV is reported. A I4X

gas target was exposed to a pulsed singly charged a-particlc Imam from

the CX accelerator of the Lnboratori Xazionali di Lcgnaro, and y-rnys emitted in coincidence with the beam were measured with a 90 cm3 Gc(Li)

detector. A similar run with the same target ns well ns nil activation experiment were earned out on the nearby parity-allowed resonance

at G.241 .MeV, in order to test the electronic gain and the efficiency in the

parity-violating experiment. The energy spectrum from the Gc(T,i) shows

no peak due to the decay of the C.135Me\* state and allows to sot an upper limit of 2-10'3 cV for the parity- violating width of this resonance.

UP. LIM. WIDTH= .002EV

form MSS-419

'REV. 7-1 4*64> use OMM*NSS*OC PHOTONUCLEAR DATA SHEET 16

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAUOP STANOAROS

F

A= 19

F

A=19

I

17

I" A=19
18
R.J. Horsley, R.N.H. Haslam, and H.E. Johns

Phys. Rev. 87_, 756 (1952) ref.

method

EL EM. SYM.

F 19

REF. NO.

9

52 Ho 1 hmg

reaction RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANOB TYPE MANGE

ABX 10- 25 C 10- 25 ACT-T 4PT

G.2N ABX 19- 26 C 19- 26 ACT-1 4PT

SEE 54TA1 FOR RE-ANALYSIS

Table L Information obtained from the Fl, (7, n)P*

and F

u

(7, 2h)F17 cross-sectional curves.

Reaction F‘»(t. n)FTM F>»(t. 2n)F» Peak position 20 Mev 26 Mev

Peak cross section 3.48 mb 0.66 mb

Width at hail-maximum

Integrated cross section

12.9 Mev —

(to 26 Mev) 0.039 Mev-barns 0.0024 Mev-bams

Fic. 2. Cross section rj energy curves for the reactions

F'*(7, m)F* and F1 ’(t. 2n)F,T

. The doited line indicates the sura

of the two reactions. The (y, np) and (7 , 2p) calculated thresholds

are marked.

POSM N3S-41I »EV. 7.1 4- 64t .sc:mu.oc j»oio-p«4 PHOTONUCLEAR DATA SHEET 1 9

U.S. DEPARTMENTOF COMM£PC£

NATIONAL BUREAU OF 3T ANQAHOS
REF- G. Ferguson, J. Halpern, R. Nathans, and P.F. Yergin

Phys. Rev. 95_, 776 (1954)

EL EM. SYM.

F 19

REF. NO.

54 Fe 1 rs

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,Sn ABX 10-25 C 11-25 BF3-I 4PI

The direct detection of neutrons from (ypi) reactions induced by betatron bremsstrahlung has been

applied to cross-section determinations using gaseous targets at approximately 100 atmospheres pressure. Results from oxygen are consistent with other determinations. The remaining elements represent new

results and show the familiar giant dipole resonance for the photoneutron process. Parameters of the reso- nances are determined and related to the systematic behavior previously reported for other elements.

Fig. /. Photoneutron excitation function for fluorine.

FORM N3S-4 18 '"REV. 7-14-64) USC OMM-N as-o C PHOTONUCLEAR DATA SHEET 20

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
J.G. V. Taylor, L.B. Robinson, and R.N. H. Haslam

Can. J. Phys. 32, 238 (1954)

REF. EL CM. SYM. A Z

F 19 9

methoo REF. NO.

54 Ta 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE detector

ANGLE

TYPE MANSE G,N ABX 10- 17 C 10- 17 act-1 4PI

Measuramenc is an extension of earlier work:

R, J. Horsley, R.N. Haslam, and H. E. Johns,

Phys. Rev. 87, 196 (1952)

Fig. I. Cross section for the reaction F”(>, n)F ls

. The heavy line shows the cross-section curve determined in the present work, the dotted line the previously reported cross section (5).

F 0 PM N3S-41S

P £ V . '• 1 A. 641 USCOMM.OC 2S0I0-P44

U.S. department O c COmMEPC i NATtONAC 6 UPEA 0 OF STAMQ4SDS PHOTONUCLEAR DATA SHEET 21
REF' W.Aust.

B.

J.Lasich,

Phys.

E.

3,

G.456Muirhead

(1955)

and G. G p

METHOD

Shute ELEM. SYM.

19

REF. NO.

55 La 1 JOC

REACTION

G,P

RESULT EXCITATION ENERGY

SPC 10 - 17

18 MeV-mb

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

c 17 EMU-D DST

Fig. 2 (a).—Energy distribution of photoprotons from >»F. rue expected positions of proton groups botweon known onorgy levels in 18F and 19 0 aro indicated by arrows above the histogram as follows :

t

18 F* to l “0 (ground stato),

; >»F* to > 8 0* (1-08 MoV stato). (Tho onorgy levels in “F wore obsorvod in l9 0(p,n)“>F (Ajzonborg and Lauritsen

1055).) Tho limit of resolution is 0-3 MoV.

Fig. 2 (6).—Corresponding background tracks.

Tig. 3. —Angular distribution of photoprotons from 18 F. 0=angle between incident photon and tho proton, a (0) =difforontial cross section (arbitrary units). Vortical

linos roprosont standard deviations of tho points.

(o) Enorgy rango 4-4—8-5 MoV. No. of tracks = 75, percentage background = 10, least squares fit to data is shown by eurvo (1—5)+(15 tF 7) sin8 6.

(6) Enorgy rango 2-9—4-4 MoV. No. of tracks=180, percentage backgrounds* 13£,

loast squares fit to data is shown by curve (lO^SJ-HlO^ 11) sin 1 9.

P

P

P

P

I 22

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
Scr - 0. Reagan

Phys. Rev. JjOO, 113-120 (1955)

C.L. s.M .or-'

19

method

Linac; counted delayed neutrons from N 17

REF. NO. 55 Re 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.2P ABI THR - 400 C 80-400 ACT14P1

400

f cidE = 0.0037 MeV-bams.

80 r

, Fig. 3. Yields from the and F

u (y,2 p)S17 reactions, " functions of radiating electron energy. The solid lines are

i'"» kromau of characteristic energy 25 and 40 Mev, corresponding

t- integrated cross sections of 0.067 and 0.0037 Mev-barn,

reflectively.

form NBS-418

[P EV. 7-t 4-641 •JSCOMM-OC 26 0 I 0- P6 4 PH0T0NUCLEAR DATA SHEET 23

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Ref. W.L. Bendel, J. McElhinney, R.A. Tobin

Phys. Rev. Ill, 1297 (1958)

Elem. Sym.

F 19

Method Betatron; neutron yield; radioactivity; ion chamber

Ref. No. 58 Be 1 EH

Reaction E or AE

S"

dE Jtr Notes

F 19

(Y,n) Bremss.

10-11 10-11

Beak found at 10. V7 ±0.02 based on

(y, n) thresholds in F^9, Nl^ and C

1

.

FORM HBS-413

(8-1-33) USCOMM-OC 1835«-P83 PHOTONUCLEAR DATA SHEET 24

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
J. O'Connell, P. Dyal, J. Goldemberg

Phys. Rev. 116, 173 (1959)

METHOD

F

REF. NO.

19 9

Betatron 59 Oc 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,2N RLI THR-100 C THR-100 ACT14-PI

REL T(j G.N

Table II. Relative integrated cross sections.

Element (y.n)

Position

of the peak for (y.n) (7.2.0

Position

of the peak (or (7.2.0 C“ 1 23 Mev 0.003 • 42 Mev

N*>‘ 1 24 Mev 0.007* 0“ 1 22 Mev 0.002 40 Mev

F” 1 20 Mev 0.14 32 Mev

N'a3 1 20 Mev 0.05 32 Mev

p« 1 20 Mev 0.06 (>,2 p) 0.08 (7,2pm

45 Mev (7,2.0) 50 Mev (y,2pn)

• The (y.*) integrated cross section waj taken from reference 4.

MAXIMUM BETATRON ENERGY (MEV)

Fig. 1. The energy dependence

oi several photonuclear reactions. The relative yield scales of dif- ferent graphs are independent.

form MBS-411

(R EV. 7-1 R-SAI USCOMM-OC 2SC10.PS* PHOTONUCLEAR DATA SHEET 25 — u.s. oerartmentof commerce

NATIONAL BUREAU OF STANDARDS
Kef. E.C. Booth

Nuclear Phys. _19 ; 426 (i960 )

Elem. Sym.

19

Method Van de Graaff; electron bremss.; Ring scatterer; Nal Ref. No. oO Bo 3 JHH

Reaction E or A E C7d E J " Notes

( 7, 7 ) j Bremss.

. 0.5-2.

2

1.34 3/2 Mean lifetime t/g:

= (O.5±O.3)l0" 15 sec [resonance scattering]

where g = ( l+2 l)/( 1+21 )

.

The 1.34 MeV resonance corresponds

to a dipole transition between the

1.46 MeV state and the 0.109 MeV

state (from yield curve data).

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF 3TANOAROS

»-C RM N S$-4 I 8

'6-i-c :) 'JSCOmv-OC M550-P63 PH0T0NUCLEAR DATA SHEET 26
B. Forkman, I. Wahlstrom

Arkiv Fysik 18, 339 (i960)

Page 1 of 2

:lcjn. if*. a

19

METHOD

Synchrotron; proton spectrum; angular distribution; nuclear

emulsion; cross section.

REF. MO.

60 Fo 2 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE

G,P RLX 10 - 18 C 16. 19 EMU-D DST

(15-5, 19)

, p k

In Figure 8, W(9) = 1 + 7 cos“9 - 6 cos Q

is

'• tpectrvan — V.S soectrum n l

Fig. 3 . The proton u»-*r.t>ution from ins 13.3 3t#V .rrmdisutm titer ins onground a * Energy - Me*

a

Fig. 3. TTm proton •pectrum oorix-Hpontiing to pi. •.ton ahaon-cion in the energy range 13.3.-10M<

Tatis I The reported m>nn.ir.ee.> MoVi n F19 untamed by photo-excitation. The column aeatiinjs the reference* a;;d methods employed.

*3 M#* irradiation Tevlor r* ai. Coldemoerg Uenu«-i "l ai. Jertozzi ft ai. LaJicn u ai. Present

;3- ana .-vat A 4. .«! “] work

-

V. n nl n i ,*/. n i r/. pi CA P) J 1 activation neutron- vieid activation time oi nuneer nuclear

J -

curve curve curve flignc emuiaion i omulsion

l ,

• • - 10.47 10.4

19.8 —

L io.a 1 1.0 —

w 11.2 J 11.3 11.3 1

11.1 11.4 11.9 11 .9 i2.i> 12.0 II. 1) 12.2 — .2.2

.3.0 12..1/ — 1 3.3 13.2 IJ.d

-* W -~i _ 14. ir 13.3 13.3 13.$ 13.4 10.3

1 t s 5

’ S 3 -0 M 2

; 18.1;

,-i* 4 . The nroton lutnnuium from the .‘J MeV .rramauun the tacaizrouxnl is auoLracttd.

• OMM HBS- 4 I 8 «CV. T-I4-MI U«COMM»OC 26010-PS4 PHS30HUCLEA* DATA SHEET 27

U.S. OEPARTMENTOF COMMERCE

NATIONAL BUREAU OF ST ANOAROS
PAGE 2 of 2

METHOD

C.L. CM. 3 r M.

F

REF. NO. 60 Fo 2

19

NVB

REACTION RESULT EXCITATION ENERGY

SOURCE detector

ANGLE

TYPE RANGE

Cross -wet.on

-T

2a u':-,4

! IV 9

"x 10.47

' \

O'

1"

I -16

( 3.5d 4*i

; 198 2*~~

^ OjJ

I -'.0

i

72-

L'ij. 7. The level scheme for the photo-disintegration of Fl

'J

. The histogram to the left gives ti. cross-seci ion for (y, ±j) in arbitrary units. The dotted curve shows the {/, n) cross-section from - in miiiib.irna. The numbers for some of the transitions to O1 ' denote the reiutive branching ran. - in per cent.

Fig. 8. The angular distribution of the protons with energies

less than 4.fl MeV from the 15.5 MeV irradiation with thick

teflon target.

worn* N»S-41»

(REV. 7- 1 S- *41 U3COMM-OC 2«010-P«4 PHOTONUCLEAR DATA SHEET 28

U-S. OEFARTMCNT OF COMMERCE NATtOHAL BUREAU OF STAMOAROI
roRM NBS-418

(8-1-«3> U3C OMM-OC 18956-P63 PHOTONUCLEAR DATA SHEET 29

U.S. OIMRTMHT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
J.D. King, R.N.H. Haslam, W.J. McDonald

Can. J. Phys. 1069 (i960) 19

METHOD

Betatron; neutron cross section; activity; Cu°3(y, n)

REE. NO. 60 Ki 4 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYRE RANGE TYPE RANGE G,N ABX 10-23 c 10-23 ACT1

4PI

(10.4-23.0) (10.4-23.0)

Peaks at: = 10.6 MeV (very small)

12.4 MeV

14.0 MeV

16.1 MeV

17.2 MeV

19.3 MeV

<9(3(9

Peaks at 14.0 and 19.3 MeV suggest split giant resonance, give quadropole moment

-24 2

Q = 0.30 x 10 cm .

I- 1 <;. 1. Vicltl Of j-' 1 .\-r.i%

' per unit monitor response a* a function of the maximum cncrirv in rh- spectrum. I ne fuU curve is an analytic lunction of the form y - «i|l +«n b(b? Ju

* 1 lr" -• 1 hc iross obtained from the Zthrt yt‘,1 c^e!

>l ’

form M8S-41S

(REV. 7* I 4*441 USCOMM-OC 26010-P44 PHOTOMUCLEAR DATA SHEET 30

U.5. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS
Ref. K. Reibelj A.K. Mann

Phys. Rev. U8, 701 (i960)

Elem<, Sytn.

19

Mechod Y's from F

1 ^(Y,ory') reaction; protons from Van de Grsaff; NaT

Ref. No. 60 Re 1 JHH

Reaction E or AH <Jd E J* Notes

F 19

(y,y) - 7 < a > (E

? = 2.05 MeV) = < 0.03 mb

Assuming dipole transitions.

*Orm HBS-418 ,ICOMM*OC 1§«96-P*9

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU O » STANOARl-^

pkotonuclear ga-ta SHEET 31
! D. Sadeh

Compt. Rend. 250 , 16^2 (i960)

C. U C.M . -1 I f

19

Betatron; neutron yield; activity; ion chamber

REF. NO.

60 Sa 2 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G.N RLY 10 - 12 C 10-12 ACT-I l4.PI

Breaks in activation curves:

10..ko MeV

10. ^5 MeV

10. 71 MeV

10. 86 MeV

11. 06 MeV

11. 18 MeV

11. 38 MeV

11. 57 MeV

11. 8I4- MeV

12. 09 MeV

form NBS-418

(REV. 7-1 4-64) USC OMM-O C 26010-P64 PHOTONUCLEAR DATA SHEET 32

U.S. DEPARTMENT OF COMMERCE NATIONAL BUR E A U OF STANDARDS
T.G. Walker, W.T. Morton

Proc. Phys. Soc. 4 (i960)

EL EM. i'r M. -V

METHOD

F

REF. NO.

19 9

Synchrotron; neutron cross section; radioactivity

60 Wa 2 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G, N ABX 10-240 C 120-240 ACT -I 4PI

(120,180,21 0)

a = (3.5±0.3) IQ’

27 quivalent quantrum

Data below 120 MeV from other workers; 50 MeV data is that of Barber et al, Phys. Rev. 98.

73 (1955).

Maximum bremaatrahlung Yield of l,F from lfC(y, n)“C

energy (Mev) «F a

17 Al yield 240 1-83(17) 0-18(9) 0-062(13) 1-62 180 1-78(16) 0-1806) 0-058(16) 1-50 120 1-6(14) 0-15(14) 0-045(14) 1-34 100 1-5 — — 1-27 70 1*4 0-11 — MS

50 1-22 0-07 1-0

FOPM NBS-418

<R EV. 7« I 4-«4> SC OMM-OC 2601G-PS4 PHOTONUCLEAR DATA SHEET 33

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOARDS
. E.C. Booth , K.A. Wright

Huclcar Phys. , 472 ( 19^2 )

Elem. Syra.

19

’ l,od 4 MgV

electron Van de Graaff; bremss.; nuclear resonance

zcattering, ring scatterer; Nal

Ref. No. 62 Bo 6 JHH

Renction E or AE ad E ] * Note*

,19

(7,7)

Bremss,

0-4

Table 3 Mean Lifetimes of excited states deduced from the resonance scattering of bremsstraUunf

Nucleus % Energy (MeV) Spins * r,/r II" (8) TX 10“±«%

(see)

F“ 100 1.46 . 0.13 (l) 0.25? Xa* 100 2.08 i*-t 2 0.1 0.79 >0 04

2.39 _ > ? 0.53 u> > 1.6? 2.64 _ 3 ? 0 6 at >0.3?

2.70 )

? (0.1) U) > 0.008?

t 2.98 __ 3 > 0 46 (11 0.03? Al" 100 2.73 r-i- i •£0 3 0 91 >0 22

2.98 -4 T 0.216 l 2.2 x 10"4 Si* 4.71 1.28 j.-j. 2 1 0.88 1.5 2.43 -i* 2 (11 0.98 0.2 P“ 100 1.28 j._ } . 2 1 0.S8 2.2 2.23 -1 3 1 0.79 4.5 3.13 -i 2 U> 0.98 0.2 3.29 -* 3 ? 0.79 >is(r./D'

3 41 -? ? in > i3<(r„ri*

3.51 2 ? 0.98 o.o2 ( rjn'

S» 95 3.78 o*-> ? ? in > 0. 6fi/vn*

SM 4.2 2.127 0^-2 5 1 0.63 > 10

Cl* 75.5 1.22 ? l in 6g

1.76 _ >

? id (11 2.7(2.631 — ? ? ? (n 0 31 ;(rj/V

3.01 — ? ? ? (li 0 3Tjir.n*

Cl* 7373 3.1 ? ? ? ii» >o.T4f(rjn*

3.17 ? ? ? in > i.o<(rjtv

Cl” 24.5 0.838 »--? 1 in > 13;’ 1.72 — ?

1 > in >0 <g[F*D' K* 93 2.53 }*-? ? l (ii > 1.6? 2.82 — ? ? 1 .n > 1-5? 3.02 _ ) ? 1 (ii 0.37?

3.60 _ 3 ? 1 (ii >0.7?

3.98(3.941 — ? ? ? at o.uurjrr

4.U6-4.12 - > ? ? in > o.irif,/T

Ca* 06 3.90 0* —2* 5 1 0 63 >0.46 Cu* 60 1.33 2 in O 9 44>r> 11

The factor g equals (2/-*- l)(2/.-r l)“ l

.

NQS-418 U.S. DEPARTMENT OP COMMERCE

'•''ll national bureau of IT ANOAROS

~ omm-oc T8596-p«3

PHOTONUCLEAR DATA SHEET 34
c. l. iM. jiM. E. Braun

Z. Physik 166, 62 (1962)

METHOD

F 19 9

REF. NO. Van de Graaff; proton spectrum, angular distribution; nuclear

emulsion 62 Br 3 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,P SPC 18 D 18 EMU-D 2-10 DST

( 17 . 6 ) (17.6)

In Figure 5, W(9) = a + b sin 9

Pi*. 4. Enersieverteiiun* der Photoprotonen aut Fluor. Gcstrichelto Kurve: Verteilun* nach der statisuschenTheorio, Stulenkurven: gemessenes Spektrum fiir # — 90* btw. Mitts*- wrrt derSpektren fur d — 30*. 150*. Damnter: Niveauschemn

del Restkeraes 0U (von recats nacn links)

tto

f .

s ruv

0"-Vit. #* 2* g*

_u 1 I i_

FI». 5- Anisotropfo-Faktor Wain Abhan*igkeit son der Protonmenergie mlt statistiscbem

Pstlor, daronter Niveaut des Restkeras Ou

fo ru NBS-418

(REV. 7-1 4-SAI USCOMM-OC S90IO-P94 PHOTONUCLEAR DATA SHEET 35

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OP STANDARDS
Ref. W.E. Del Bianco, »phens

Phys. Rev. 126. 7»)

~^ethod Electrostatic ge; H''

> (p,'y)He^ reaction; activation of

Elem. Sym.

19

positron emitter; 2 ioincidence.

Ref. No. ^ St i JHH

Reaction E or AE

s

<7d E J

it Notes

(Y,n) 20 . 2- 21 .] a(y,n) = 3.30±0.1il mb at 20.48 MeV.

Teflon sample.

Fluctuations in Figure J may be due,

in part, to carbon correction [ 10- 50#

of total o(y, n)].

Figure

section in millibarns as a function of

photor

J_: The F

1 ^(y, n)F

1 ^ reaction cross

energy in MeV.

form NBS-418

<S-1*4S> U1COMMOC 168S6*R*» PHOTONUCLEAR DATA SHEET 36

U.S. DEPARTMENT OP COMMERCE

NATIONAL 3UREAU OP STANDARD
W.R. Dodge, W. C. Barber

Phys. Rev. 127. 1746 ( 1962 )

Elem. Sym. A Z

F 19 9

Method Magnetic analysis of proton spectrum produced by electron bombardment

Ref. No. 62Dol BG

Reaction

(e,p)

E ot AE

18 , 24.5

30

3-25

3-7

4.5

7-3

10.1

J * Notes

For ground state transition E = 11.42

11.90

12.74

15.70

18.70

y

^Calculated assuming 100$ ground

state transitions.

Correspondence between (e, pe‘)

reaction and ( 7, p) react ion; assumed

electron has associated with it a virtual photon spectrum. Electron

production yields analyzed by use

of El virtual photon spectrum to

obtain (Y,p).

Angular distribution measured- assume

to be of form A'+B 'cosS+C 1 sin y+. .

.

U.S. DEPARTMCMT Of COMMERCE

NATIONAL BUREAU OF STANDARD* FORM HBS-418

(8-1-63) USCOMM-OC 18BS8-P83 PHOTONUCLEAR DATA SHEET 37
Ref'*»e«ai

I»p. it. ka (1«Q)| mnto to ftollato* (to* 9/5/«J)

Elem. Sym.

F

A

19

z

9

Method

t — »' .

Ref. No. 63Sal as

Reaction E or AE

S"

dE J * Notes

(•»•*) *U3 7.7 ^•7 0.5^

lflO* • 2.0±25$xl0-52 cm

2/sr

««rnayMif tt tZMiitl

•|+snai state te t onitai

Fig. 9. Spectrum of 41.5 MeV electrons scattered from CF, at 180°.

i

form NBS-418

(8-1-63) USCOMM-OC I8836-P63 PHOTONUCLEAR DATA SHEET 38

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Ref. K.M. Murray, ff.L. Bendel

Phys. Rev. 1^2, 113^ (1963)

Elem. Sym.

Ref. No. 63 Mu 1

Method 2k MeV betatron; proton spectrum; silicon-diode charged particle

detector; r-chamber

Reaction

(y,p)

E or AE

Bremss.

23.5

<7d E Notes

On basis of spectrum measured with

absorber concludes there are some heavy charged particles present.

Detector at 120°.

FO RM NBS-418

( 0 - 1 -63) U3C OMM-OC 10696-P63

U.S. OEPANTKtMT 0* COMMERCE

NATIONAL 0U3IAU Of STANCARO

PHOTONUCLEAR DATA SHEET 39

Tabls EL Proton energies and Fu lcvda, in MiV.

E, F*** toO** to 0***

F®* to 0** ground stmte Fork- Dodge* sum* Other

(t^») (?,*)

(2.98) 11.42 11.4 11.5*^ 3.58 ±0.06 11.80 15.44 to 163

. 11.90 11.9 11.9*-

4.28±0.06 12.55 *<g-'2Slr

.

12.2* 12.74 UA

(4.97) .. .. J

13A

5.83 ±0.06 14.19

(6.23) (16.60 to 1.98) 6.97 ±0.05 15.41 ISA 15 -3*- 1 13.70

(7.53) 8.10±0.08 16.61 16.5

(8.65) " *

000 — FLU0*fl« A NO ABSORflER B 7mmcm' 700

600

t 500

too

flwO 70

ENERGY IN MfV

Fio. 7. Pulse-height dismbui from fluorine. Curve A represenu dr smoothed value of data taken with »

absorber. Curve B represenu dr smoothed value of data taken

7 mg cm”1 of aluminum between tine and detector, and was corrected m ti* same manner as in Fig. S.

>000—200 -

Fas. 8. The

'sent* the sum of

j Fig. 7, plotted ifftinst

| u the left Theriferajce (A—
ref. E. C. Booth, B. Chasan and K. A. Wright

Nucl . Phys. 57, 403-420 (1964)

EL EM. SYM.

F 19

METMOOVam de Graaff; resonance fluorescence

REF. NO. 64 Bo 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,G LFT 1-3 C 1-3 NAI-D 100

(0.5 - 3.0) (0.5 - 3.0)

ABI

Table 1 — _ Cases of observed resonance fluorescence Nucleus

multipol.

Stale (MeV)

Spin rjr T(,gwru*/r-ri

(sec).

Mean lifetime T BCW

(sec)

Mean lifetime T

other

(sec)

Ref. rii rw BCW — —

-

F

1 * 0.00 El 1 .46 0.15 27±8x IO-14/’,//; 6.2±2x 10-“ 5± 1.5 x 10'“ *) 1.1 x 10-» Ml *) 1.56 1* (0.04) ii ±4x10-“/’,//; 2o:i°x to-“r„/r

1.5 x 10-*

- .. _. .

c O RM N3S-41S

'REV. 7.1 «.«4) U5C OMM. O C 2«0t0-P64

U.S. DEPARTMENT OF COMMERCE NATIONAL SLREAUCR STAMOAROS PHOTONUCLEAR DATA SHEET 40
SEP.

J. M. Loiseaux, M. Langevin and J. M. Maison

Proc. Parts Conf. 1043 (1964)

EL EM. SYM. A

19

METHOD

Betatron

REF. NO. 64 Lo 3 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G * G ABX 10-30 C 10-30 NAI-D 140

The effective differential scattering cross section remains quite constant from

20-30 MeV.

form H0S-418

(REV. 7-1 A- 64) USCOMM-OC 28010-P64 PH0T0NUCLEAR DATA SHEET 41

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUR EAU OF 3T AN DA RD3
S. Seki, M. Yamanouchi and M. Miwa

J. Phys. Soc. Japan _L2, 1999 (1964)

EL EM. Sr M.

19

METHOD REF. NO.

64 Se 1 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G ,XP SPC THR - 24 c 14-24 EMU-D 2-15 DST

Target thickness 3.4 mg/cm3 and 5.7 mg/cm2

.

Proton Energy (McV)

Fig. 2. Energy spectra of photoprotons from fluorine.

1 .ible III. Coefficients tti's of the Expression (2). Energy region

(MeV) CLi <Za aA

3.2^iS,< 4.2 0.45 -0.39 -0.32 -0.28

i MeV 4.2 i.E,< 5.2 0.73 0.53 - 0.34 -1.31

5.2 'E,< 10.0 0.75 - 0.65 -0.74 0.13 w ,, 8.0 •',£',<10.0 0.25 0.14 -0.27 -0.67

'4 Vlev

10.0 'E„ 0.39 0.14

j — 0.27 —0.70 assuming an angular distribution of the form

1-rfli cos0 +a* cos*0+ai cos’tf+a* cos’tf . ( 2

)

Eo = i8.VeV Eo-24 MeV

form NBS-418

(R EV. 7-14-04) USC OMM-OC 20010-P64 42

Fig. 4. Angular distributions of photoprotons from fluorine.
G. Tessler, W.E. Stephens

Phys. Rev. B 129- 36 ( 1964)

ELEM. STM.

19

METHOD

Tandem, T^(p,y)

REF. NO.

64 Te 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G.MU-T ABX 20-21 D 20-21 NAI-I 96

Ftc. 10. Nuclear absorption

cross section in F

1 * as a function oi photon energy. The results of this experiment are plotted as dots. Other results are shown for comparison.

19.8 19J9 200 20.1 20.2 20.3 Photon Energy (MeV)

20.4 205 20.6 20.7

Table IV. Structure observed in the nuclear

absorption cross section curves.

<Tpe»k Half-width <rdE Element (MeV) (mb) (MeV) (MeV-mb)

Be* 20.47 6.8 0.13 0.45

20.73 10.1 0.15 0.9 0“ 20.62 21.5 0.19 3.9

2 1 02 < 20.86 \ 2J.5 —0.40 10.4 >22

F" 20.09 21.9 0.16 3.5

form NBS-418

IR e V . 7-1 a- 841 USCOMM.OC 26 0 1 0- PS 4 PHOTONUCLEAR DATA SHEET 43

U.S. OEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
F. I. Haviicek and M. Modesto

Energ. Nucl. _12, 77 (1965)

£L£M. STM.

F

REF. NO.

19

65 Ha 2 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,A SPC THR-31 C 31 EMU-D 5-20 DST

' > • • I < I I i I I I I I I I I I 10 15 20 25MeV

4,01 MeV

Fig. 8.

form N8S-418

(REV. 7-14-04) USC OMM-OC 26010-P64

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS PHOTONUCLEAR DATA SHEET 44
REF. F.P. Denisov, A. Duisebaev, K.V. Kosareva,

J. Nucl. Phys. (USSR) J., 32 (1965)

Sov. J. Nucl. Phys. 2, 58 (1966)

METHOD

EL EM. SYM. and P.A. Cerenkov

19 9

Synchrotron; recoil nucleus method 66 De 5 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,N NOX THR - 260 C 260 ACT1

DST

Measured range of recoiling 1S F nuclei.

0, 20 - C

3

i o,iS -

~ o.ioV

QJJS0

30 OS SO 7S 30 10S 120 13S ISO

0\.i.,deg.

Angular and energy distribution of the F" recoil nuclei; the

points on the curves correspond to the following pressures (in centimeters mercury): O— pressure -0; A -3.3; X — 10; *—15.

form NBS-418

!R EV. 7-1 *.#41 USCOMM-OC 26 010* P#

PH0T0NUCLEAR DATA SHEET 45

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
B. S. Dolbilkin, V. A. Zapevalov, V. I. Korin, L. and F. A. Nikolaev

Izv. Akad. Nauk fiz. 30 . 349 ( 1966)

Bull. Acad. Sci. USSR-Phys. 30, 354 (1966)

METHOD

E. Lazareva

EL EM. SYM.

19

REF. NO.

66 Do 2 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE type range

G-MU-T ABX 8-30 C 260 MGP 6-30 4PI

Resolution 120 keV 10 MeV

220 keV 20 MeV

4H

fi) mb

Fig. 2. Nuclear absorption cross section of fluorine.

FORM NBS-418

(R EV. 7-1 4-041 U3COMM-OC 20 01 0-P0 4 PHOTONUCLEAR DATA SHEET 46

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STAN DA R 03
REF. G. Baciu, D. Cacana, C. Deberth, and I. Raileanu

Rev. Roum. Phys. 1_2, 385 (1967)

METHOD

ELEM. SYM.

REF. NO.

19

67 Ba 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.N ABX THR-25 C THR-25 ACT1

4 PI

NSA 35223 BREAKS

35223 ON THE NUCLEAR SHAPE AND THE PHOTONEUTRON

CROSS SECTION OF THE UF NUCLEUS. Baciu, Q.; Caiana, D.; Deberth, C.; Ralleanu, I. float, of Atomic Physics, Bucharest).

Rer. Roum. Phys., 12: 385-91(1967). The absolute cross sectloo for the (y.n) reactloo on.n F was

measured by using the bremsstrahlung of the 1FA betatron with a maximum energy of 25 MeV. The Induced radioactivity In the samples of C^F.^t (teflon) was recorded by means of a y-y scintillation spectrometer. The data supplied by the spectrometer wars recorded by a SA-40 type (Intertechnique) multichannel

analyser. The yield points were taken at 0.25 MeV Intervals. The betatron energy scale stability was controlled at least two Umss per dsy and a deviation smaller than *10 kaV was observed.

The calculated cmse- section shows several discrete resonances;

those disposed In the giant resonance region were well described

by three Oausalana. The maxima occur at 15.10, 15.85. and 19.90 MeV. From the fine str ucture of the cant resonance the msoleue deformation parameters and the Intrinsic quadrupole moment were

calculated. They are: y » 12*. * 0.1«, and Q, = 0.125 mbarns.

(auth)

-orm N3S-418

[REV. 7- 1 4- 441 USCOMU.OC 28CI0-PS4 PHOTONUCLEAR DATA SHEET 47

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
J. M. Loiseaux, J.

J. de Physique 28 ,

METHOD

M. Maison, and M.

11 (1967)

Langevin

EL EM. SYM. A

F

REF. NO.

19 9

67 Lo 1 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,G/ ABX 14-32 C 34 NAI-D DST

Fig. 6. Sections efficaces differentielles de diffusion a 1 10" pour >*F (I). "Na (III) et Mr (V). Section efficace prevue par la relation de dispersion pour !, Na (courbe II) et Mg (courbe IV).

FORM NSS-418

(R EV . 7-1 4-C4) USCOMM-OC 26010-P04

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 48
K. Abe, E. Tanaka, N. Kawaraura, M. Kanazawa and N. Mutsuro

J, Phys. Soc. Japan 25 . 1507 (1968)

ELEM. SYM.

19

method REF. NO.

68 Ab 1

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G ,XP SPC THR- 22 C 22 SCD-D 3-13 90

PRCTON ENERGY IN

I

i

5 6

Fig. 2. Photoproton spectrum from a polytetrafluo- roethylene target.

FORM NBS-418

• Rev. 7-1 A- 94) U3COMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 49

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF ST ANDAROS
B.G. Cook and C.C. Jones

Nucl. Instr. & Methods _59, 229 (1968)

ELEM. SYM. A

19

METHOD REF. NO.

68 Co 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,N ABI 10- 50 C 10- 50 MOD1

4PI

G,2N ABI 25- 50 C 20- 50 M0D-I 4PI

5 0

J* CT(y,sn)dE = 221 ~ 20 M®7-TM13 -

A

40' liquid scintillation detector was constructed for use in photonuclear work. Integrated cross sections for reactions in which one

or two neutrons are emitted were measured up to 50 MeV for fluorine. The efficiency of the detector was about 60%.

FORM N3S-418

(R EV. 7-1 4-941 USCOMM-OC 29010-P94 PHOTONUCLEAR DATA SHEET 50

U.S. DEPARTMENTOF COMMERCE

NATIONAL. BUREAU OF STANDARDS
R. A. Meyer, W. B. Walters, J. P. Nucl. Phys. A122, 606 (1968)

METHOD

Hummel

F 19 9

REF. NO. 68 Me 4 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,2PN ABX THR-300 C 20-300 ACTI

4PI

Table 1 Summary of integrated cross sections fo£m*‘ od£(MeV • mb) for the reactions studied

Reaetion/£^u(MeV) 65 105 145 215 295

*0(v. 2n)"0 0.42-0.02 0.57 ±0.04 0.56±0.05 0.63.-0.09 1.29 ±0. 16 "F(y. 2pn)“N 3.7 =0.2 5.0 ±0.3 6.1 ±0.5 S.4 -1.0 13.6 ±1.5

,TA1(-/. 2pn):*Na oo Lj II o u* 13.3 ±0.7 17.1 -1.2 24.1 ; 2.3 5 ! .2 --3.3 a

) “V(y, a)*T Sc 12.3 -1.7 20.2 3.5 32.5 .2.6 6S.4 3.6 112 ±14

*'V(y, a3n)“Sc 0.7 -0.2 6.0 .;0.9 12.2 ±1.3 34.1 .4.1 91 ±11

*) =* 275 McV.

The dashed lines show the cross sections ex- pected for quasi-deuteron processes (curve A)

porm nbs-411 and the sum of the cross sections expected for

usco'mm*oc^2 quasi-deuteron and pion emission processes

(curve B) . 5 I

Fig. 2. Yields and cross sections for the 18 F(/, 2pn) 16 N reaction The solid line shows the assumed extrapolated yield curve behavio

near the reaction threshold. The dashed lines have the same sig nificance as in fig. I.
REF' N. Bezic, D. Brajnik, D. Jamnik and G. Kernei

Nucl. Phys. A 128 . 426 (1969)

ELEM. SYM.

19

METHOD REF. NO.

69 Be 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,MU-T ABX 10-30 C 35 MGC-D 10-30 4PI

i ol

Fig. 4. The nuclear part of the photo-absorption cross section for “F. The inaccuracy of the zero

line position is estimated to be the same as in case of l4 N. The solid line represents the photonuclear

absorption cross section of Dolbilkin el al. ?

) multiplied by a factor of $. The (y, n) cross section “)

is shown in the upper left corner.

Tablb 1 Weighted energy-integrated total photonuclear cross sections

(mb MeV)

^mt <*-i (mb) (mb • MeV-1 60 (NZ/A) ) (mb • MeV)

0.30/1* mb 3.5 Ai

(/ib • MeV-1 ) uc 133 ± 13 0.74 ±0.07 5.4±0.6 0.65=0.07 0.23-0.03 1.04-0.15 UN 195 =37 0.93=0.08 8. 4 = 1.

7

i 0.83 ±0.20 0.36^-0.08 1.28 ±0.29

«o 171 ±17 0.71 ±0.07 7.2±0.8 0.60=0.07 0.31 -0.04 0.87 ±0.11

271 ±50 0.94 ±0.1

7

14.1 ±2.7 0.82 ±0.19 0.74-0.17 1.60-^0.35

a, Si 360±30 0.86 ±0.07 17.5 ±1.7 0.68-0.07 0.83 ±0.10 0.93-^0.11 ‘°Ca 580±60 0.96±0.10 29 ±3 0.71 ±0.08 1.5 ±0.2 0.92 ±0.12 The interval of integration is 10-30 MeV. 'B.S. Dolbilkin, V.A. Zapevalov, V.I.

Korin, L.E. Lazareva and F.A. Nikolaev

Izv.Akad.Nauk SSSR( ser .fiz. ) jO ( 1966 ) 349.

°J.D. King, R.N. Haslam and W.J. McDonald, Can. J. Phys ,J8 (i960) 1069. CLEAR DATA SHEET 52

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
T. Walcher and P. Strehl

Z. Physik 2^2, 342 (1970)

tL tM . SYM. A

19

method REF. NO.

70 Wa 1 egf

REACTION RESULT excitation

ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE E,E/ LFT 1-2 D 30-60 MAG-D 28-60 DST

Tabelle 2. Ergebniu

£* (MeV) /7(eV) r?ir„ II s Rlt (fm)

1.56 (£2) (1,76 + 0.15) • lO*4 7,65 ±0,61 (47,2 ± 4,0) fm4 3,94 + 0,34

1.35 (£3) (8.1 + 1,7) • 10 -10

12,0 +2,4 (795 + 160) fm4

(4,2) vorgegeben

1.56. 1.35 MEV

Fig. 2. Die reduzierten UbergangswahrscheinJichkeiten 3(C 2, q) und B(C 3, q) als Funktion von q

2

F

: r 1. Spcktrum der unelastisch gestreuten Elektronen an LiF bei £0 = 58,0 MeV

6>=I173

; Abszisse: Anregungsenergie im ”F. Die Strahlungsschwanze der

e.aitischen Linien sind abgezogen. Die gestrichelte, die punktierte und die strich- pur.ktierte Kurve zeigen die Anteile aus der die angepaOte, durchgezogene Kurve

zusammengesetzt ist

Tabelle I. L.\l>eriinctitelle Oaten Der Korrckturfuktor der DW3A-Analysc ist wic folgt Jcfinicrt: /,.(</, £0 , £x

)=(t/<T/c/fl)DWDA/(£/<7/JD) BA

£o(McV) <9 £-• £*— 1,56 MeV £3, £x = 1,35 MeV

<T(fin-1

)

1 -'chlcr ilajilQ /« :/ 2 (fnr 2

) ala,- Felder Ja/Jn fc (I0~ 3

) (%) (10-4 fm2 /stcr) (10“ 3

) (%) (10 -7 fm2/stcr)

57,99 117° 0.243 2,37 5,2 7,94 1,106 0,244 2,26 17,4 7,59 1,176

57,99 117° 0,243 2,35 5,1 7,87 1,106 0,244 2,45 15,5 8,21 1,176

58,29 117° 0,246 2,36 5,3 7.73 1,106 0,247 2,43 19,2 8,06 1,176

59,06 129° 0,283 3,26 5,0 5,02 1,097 0,284 3,17 17,7 4,88 1,162

36,01 117° 0,092 0,30 14,7 4- 18 53

1,155 — — — — —

PORM N0S-418

(REV. 7.I4-A4I USCOMM-OC 20010
Punched Checked w/PO

IBM Card

data l An %)>.

IBM Card

REFERENCE ViAo % h>
REF. R. J.

Phys.

UPTHOO

Bag lan , C. D. Bowman and B. L. Rev. £2, 672 (1971)

Berman ELEM. SYM.

19

| 71 Ba 2 hmg

REACTION RESULT excitation

ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.N ABX 12-15 c 15 TOF-D 135

(12.3- 14.5)

(

s

FIG. 18. The 135* differential threshold photoneutron cross section for **F (see caption to Fig. 4).

FIG. 4. The 135* differential threshold photoneutron cross section for J0T Pb at low energies versus the energy of the emitted neutron (lower scale) and the excitation energy (upper scale). The arrows Indicate peaks which decay to excited

states of the residual nucleus (ES), or peaks owing to contaminating Isotopes in the photoneutrop sample. The Inset shows the * 5 'Pb(y, n) cross section averaged with a square 40-koV wide smoothing function.

Also see:

R. J. Baglan et al,

Phvs. Rev. C2, 2475

(1971)

[over]

pc om N BS-4 18 iR EV. 7-1 A-«4» USCOMM-OC 26010-P64 PHOTQNUCLEAR DATA SHEET 54

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
TABLE VII. Resonance parameters for 24>2S>26 Mg, 19 F, and 31 P. For all resonances, the area under the peak in the 135° differential cross section is multiplied by 4"- to yield approximate values for gy r yo r„/T ^gyTy0 . For those reso- nances where J

n is known, the differential area is multiplied by the appropriate factor F from Table I to obtain T y0 . El

is the laboratory neutron energy for the (y,n) reaction and £„ is the corresponding laboratory neutron energy for a neutron-induced reaction. Column 5 labels the peak as a ground-state (GS) or excited-state (ES) transition as deter- mined in this work alone.

GS

Nucleus (keV) (MeV)

£r ry o r»/r

(eV) orES J"

r y o (eV) E„ (keV) (This work)

24 Mg 22 16.559 0.61 U"> 0.40 28

55 16.596 2.4 GS (I -

) 1.6 66 no 16.656 4.0 GS (I") 2.7 128

312 16.871 10.7 an 7.1 a 354 382 16.95 432

717 17.30 19.5 an 13.0 3 804 1210 17.83 1348

1620 18.26 1799 1955 18.61 2168

:5Vtg 41.1 7.374 0.09 GS

46.8

45.1 8.746 0.31 ES

74.9 7.410 0.36 GS §-b 1.1 84.1 b 208 8.920 0.29 ES

236 7.580 0.09 GS 261 404 7.756 0.03 445

439 7.793 0.05 5 + C

2 484

472 7.828 0.06 520 515 7.873 0.46 GS 2+ c

2 567

601 7.964 0.18 661

781 8.152 1.51 GS 357 912 8.292 0.72 1003

1236 9.999 2.4 c ES i* or 1* c 1707 9.12 1869 1764 9.18 1931

26 Mg 54.3 11.155 2.6 GS i'(r, 2

+

) 1.75 62.3

63.2 11.164 0.05 0.034 72.2 181 11.289 1.0 GS 1"(1 + ,2W 0.68 202

222 11.333 1.9 GS l'(l*,2+

) 1.3 248

391 11.511 5.1 GS 1“(1* ,

2

+

) 3.5 433

621 11.753 32.5 GS 1~(1 + ,2V 22.2 684

738 15.0 d ES 5.1 1122 12.279 14.7 GS l~(l + ,2

+

) 10.0 1232

,S F 100 10.542 1.8 GS 118

31p 109 12.429 0.86 121

280 12.609 0.60 307

398 12.732 0.59 434

678 13.026 0.90 737

939 13.297 4.4 1013

3 These values for r y0 , when increased by approximately a factor of 2 in order to include the relatively high cross

sections in the valleys, agree very well with corresponding values from Ref. 8 (see Ref. 4).

b This resonance was seen at £„ =83 and 84 keV in Refs. 24 and 25, respectively.

c Analogs of states in 25 Na (see text). The value for gy r y0 Tn /T given in Ref. 26 was not corrected with the multiplicative factor in Table II.

lJ Assuming a first-excited-state transition.

^R.L. Van Hemert, C.D. 3owman, R.J. 3aglan, and B.L. Berman (to be published);

R.L. Van Hemert, University of California Lawrence Radiation Laboratory Report

Mo. UCRL-50442, 1968 (unpublished).

3 S.C. Fultz, M.A. Kelly, J.T. Caldwell, R.R. Harvey, and B.L. Berman, Bull. Am.

Phys. Soc. _1£, 103 (1969), and private communication.

^H.W. Newson, R.C. Block, P.F. Nichols, A. Taylor, A.K. Furr, and E. Merzbachar,

Ann. Phys. (N.Y.) 8, 211 (1959)*

2

^D.J. Hughes and R.B. Schwartz. Neutron Cross Sections (U.S. Government Printing

Office, Washington, D.C., 1966;, 2nd ed., 2nd Suppl., Vol. lie.

55
REF. V. Di Napoli, D. Margadonna, F. Salvetti,

J.Benuzzi Martins

Nucl . Inst. Meth. 93^ 77 (1971)

METHOD

H.G. De Carvalho, ELEM. SYM. A

F 19 9

REF. NO.

71 Di 5 hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,N ABY 10-999 C 300-999 ACT1

4PI

The use of the

19 F(y,n) 18

F,

27

A1 (y,x)

24

Na , 197Au(y,n) 196

Au, and 12

C(Y,x)

7 Be

reactions as absolute monitors for high-energy, high-intensity bremsstrahl ung

beams is discussed. The cross sections per equivalent quantum and the absolute

cross sections, in the energy range 300-1000 MeV, are reported for these reactions

"F(f,n) F, A1 (T,x) Na , and ^ 2 C(Y,x)

7 Be reactions are proposed

and suitable systems for monitoring purposes.

as very simple

10

t 2r

0 1 1 L ' :00 200 300 500 '’00 1000

9rernssrraniung energy (MeV)

Fig. I. l9 F—

18 F reaction cross sections per e.q. The circles represent values obtained by the Wilson quantameter; the straight

line is a least-squares fit of these values. The crosses represent a0

values obtained by the i7 AI—

MNa monitor.

Table 2

Energy (MeV)

l9 F—>- l3 F

<yq(mb)

27 A|_24 Na 19?Au_1MAu‘ 12C->-7 Be*

260 270^14

300 5.90 —0.20 0.37i;0.0l 258 + 13 0.37+0.01

320 0.39 —0.01 350 5.90=0 20 0.39 =0.01 0.38±0.01

380 5.95-0.20 0.41-0.01

400 0.42=0.01

420 0.45+0.01

450 5.95-0.20 0.48^0.01 249=12 0.44+0.02

500 6.65-0.20 0.49 —0.01 550 6.65-0.20 0.50-0.02 0.47=0.02

600 6.80-0.20 0.52=0.02

650 0.52 —0.02 266-13 0.47-0.02

700 7.20 — 0.30 0.56-0.02

750 0.55-0.02

850 7.60-0.30 0.60-0.02 246— 12 0.49-0.03

900 0.59-0.02

1000 7.10-0.30 0.66 — 0.02 249-12 0.51-0.03

* The values given in the last two columns are. in most cases, an

average of two or more measurements (see tigs. 3 and 4).

“Com N 35- •* 1

8

PHOTONUCLEAR DATA SHEET 56

USC OMM-N 0 S-OC

u.s. departmentof commerce

NATIONAL BUREAU OF STANDARDS
B. Friberg, G. Andersson, and B. Forkman.

Nucl. Phys. A171 , 551 (1971)

METHOO

19

REF. NO. 71 Fr 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,N ABY 10-800 C 100-800 ACT -I 4PI

Fig. 1. Absolute yields for the (>’, n) reactions in '*N, '*0 and ”K. The solid lines are the least- squares fits of the yields from low-energy processes and p

u otomeson yield.

form NBS-418

(R EV. 7-1 4-S41 USCOMM-OC 2S0I0-PS4

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAUOF STANDARDS PHOT0NUCLEAR DATA SHEET 57
REF. M. R. Wormald and I. F. Wright

Particles & Nuclei 2. 168 (1971)

ELEM. SYM.

19

REF. NO.

71 Wo 1 egf

REACTION result EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

P,G ABI 10 D 2 SGD-D DST

k*V 10=10. 129 MEV

10129 3/2 i | , | " r

64 29 2 2 4

3907 3/2'w

1554 3/2

1457 3/2'

197 5/2 O 1/2"

rr17 59

JL

4011 keV

+ <*.

19,

J keV

• 1/2* 5300

-5/2* 5270

• 1 / 2

'

form N3S-418

(R EV. 7-1 4-64, USCOMM-OC 26010-P64

Figure 2. Relative intensities of the 7 -rays observed from the 2260 keV resonance in

15 0 + p.

Table 1. Partial and Reduced Widths for the 2260 keV Resonance in 18 0 + p.

Final State (E

x

, keV)

J" F

p

F-y or F

p ra

-

r r

(eV)

r

7 .ra

or

F

p (eV)

|M| 2

(W.u.)

9aor 0p

(MeV)

see Note 1. see Note 1

19 F (g.s.) l/2+

2.4 76 0.15 (El)

l9 F (1 10) 1/2“ <0.07 <2 <0.1 (Ml)

19 F (197) 5/2+ u 35 0.08 (El)

,9 F (1345) 5/2“ <0.03 <1 <0.07 (Ml)

19 F (1457) 3/2“ 0.06 1.9 0.14 (Ml)

19 F (1554) 3/2+

0.06 1.9 6.3 x 10'3 (El)

,9 F (3907) 3/2

(+) 0.14 4.4 0.04 (El)

,S N (g.s) 1/2“ - 7 ± 2 keV 0.021

,S N (5270) 5/2" 0.65 20 (0.5)

15 N (5300) \/2+

2.3 71 (2.6)

18 0 (g.s) 0+ - 220 7 x

10~*

NOTE: 1. Using I^/P = 0.032 (see text). The errors in these widths are mainly due to the uncertainty in I^/T, which is estimated to be r 50%.

1/3 1/3 58 2. The penetrabilities were calculated using an 'effsctjre radius” = 1.6(A, + Aa

) fm

(see text). The corresponding Wigner limit tor Qt-particle emission is 2.9 MeV.
ref. T- Mo, R. A. Blue and H. R. Weller

Nucl. Phys. A197 . 290 (1972)

EL EM. SYM.

19

METHOD REF. NO.

72 Jfe 6 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE HE,G RLX 19- 22 D 4-7 NAI-D dst

HE= HB3

Excitation Energy in

l7F(VeV)

0L

(de grees)

Fig. 6. Angular distributions forr-capture y-rays from a ‘‘Nx gaseous target. The bombarding

energy attached on each angular distribution has

been corrected for the energy loss through the entrance foil and target gas, and corresponds to the energy at the center of the gas cell. Statistical errors are indicated.

Fig. 5. Excitation functions for r-capture y-rays from a

14N gaseous target. The data consist of the sum of y0 and /[ radiations to the ground and first excited states in 17 F. The indicated error bars are

statistical errors. The solid curves were drawn through most of the data points for aiding the eye. The bombarding energies have been corrected for energy losses in the entrance foil and target gas, and correspond to incident energies at the center of the gas cell. The curve on the upper-left part

is the excitation function measured at 6L = 0° over the resonance at 4.3 MeV.

form N3S-418

(R EV. 7-1 4-041 u sc omm-n as-o c

U.S. DEPARTMENTOF COMMERCE NATIONAL BUREAU OF STANDARDS PH0T0NUCLEAR DATA SHEET 59
REF. D.W. 0. Rogers, R. P. Beukens, and W.T.

Can. J. Phys. 50, 2428 (1972)

METHOD

Diamond

EL EM. SYM. A

19

72 Ro 3 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

A,G LFT 5-7 D 1-3 SCD-D DST

(5. 3-6. 2) (1. 6-2.7)

J-PI .4 LEVELS

Tabu-: 5. Transition strengths from states studied

£, A Ei J, Branchingratio

|W|J (W. U.) Ml El E2 M2

5336 1/2* ** 0 1/2* 37 + 4 0.18 ±0.03

110 1/2" 42 ±4 (10 ± 1.5) x 10-

197 5/2' , < 1 <2

1346 5/2* <1.5 <230

1459 3/2" 20 ±2 (12 ± 2) x IO-’t

1554 3/2' <2 <0.03

5613 3/2* 0 1/2' <5 <1.5 x 10— no 1/2* <2 <0.001

197 5/2' 39 ±4 (9 ± 2) x 10-4

t 1346 5/2- 61+4 0.068 ±0.018t

1459 3/2* <25 <0.025

1554 3/2' <25 <1.5 x 10-

5938 1/2* 0 1/2' 7 ±4 (8.4 ± 4) x I0' 1 110 1/2* 20 + 6 (1.1 ±0.5) x 10-

197 532' 2 ± 1 0.7 ±0.4

I4<9 3/2" 63 ±6 (7.8 ± 2.6) x I0*»t

1554 3/2

<2 <0.006

3907 3/2

* *±3 0.24 ±0. lOt 6070 7/2' 147 5/2' 54 + 5 0.077 ± 0.018 i . i :g:

1346 5/2- 19 + 2 (25 ±6) x 10"* <2

1554 3/2' 1 -0 3 1 3!i?

2780 9/2' 23 ±3 0.21 ±0.05 <3

3999 7/2" <2 <3 x 10-

4032 9/2' <1 < 1 .5 x 10-

4378 7/2' 4 ± 1 0.27 ±0.08* —

6088 3/2* 0 1/2' 25 ±4 (5 ± 1) x I0' J <1.2

1 10 1/2- 61+5 0.31 ±0.06 o . isigf;

197 5/2* 14 + 3 (32 ±7) x 10- <2.7

1346 5/2- <0.5 <0.005

1459 3/2" < 1.5 <0.015

1554 3/2' <1 <5 x 10 —

6160 7/2* 197 5/2' 31 ±3 (17 ±4) x 10- 0.47:ilo

1346 5/2' 65 + 4 0. 16 ± 0.04 0.34- JJ 1459 3/2* 1.3 t0.

6

— 0. 12 ±0.06

2780 9/2' <1 <6 x 10 —

3999 7/2- I .6 ±0 6 (5 ± 3) x 10**t 4032 9/2- 2.3 ±0.3 (7 ± 3) x I0- J t 4378 7/2' <1 < 1 .5 x 10 —

4681 5/2* <2 <0.02

* Assumed pure M I although there 11 indication of a possible large E2 component. Assumed pure M I or El.

= ORU N3S-4 18

IR EV. 7-1 A- *41 USCOMM-OC 26010-P84 PHOTONUCLEAR DATA SHEET 60

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. ELEM. SYM. A A

5

I METHOD

N. Shikazono and Y. Kawarasaki

Nucl. Phys. A188 . 461 (1972) P 19 9

REF. NO.

72 Sh 2 egf

EXCITATION ENERGY

SOURCE detector

REACTION RESULT ANGLE

TYPE RANGE TYPE RANGE G , PG SPG 0-14 C 14 SCD-D 87

G , AG SPC 0-14 G 14 SCD-D 87

G.G/ SPC 0-14 G 14 SCD-D 87

Table 1 Gamma*rays resulting from the photon bombardment of a (CFt ), (teflon) target

1 McV)

Observed

peak

Relative

intensity Assignment

reaction transition

1.66 F 38 ill 1 "Fty, P7>‘ "O 3.64 — 1.98 *> 1.94 F 20 ilO 1 g F(y, py)'"0 3.92 — 1.98 •> 1.98 F 158 := 10 ,9 F(-/, py)‘»0 1.98 — 0 *> 3.91 D, F 17 i 8

,, F(y1 -/) , *F 3.91 — 0

5.27 D, S. F 71 i 2

>r> F(y, xy )"

N

5.27 -- 0

5.30 D, S. F 93 - 4 ‘"FC/. i-/)' 5 N 5.30 - 0

6.11 D.S, F 1 3.9i 1.3 "Ffy.y’VF 7.66 - - 1.56 7.66 D, S, F II. 5i 0.8 ”F(y.yV’F 7.66 — 0

*) The transition is identified by comparing the transition energy with that from the level scheme for “O aiven in ref. J0

).

Table 5 Excitation energies and ground state transition widths obtained from the 1 ’Ffy.y')' "F reaction

Excit ation energy (kcV) T^Fy (eV) ,

present previous work work

.tuoh - h 7661 4 3905 *) 7660 3 ') T; t 3*)

0.44 j 0.10")

0.49 ) 0.04 *) 0.04 a 0.03

2.6 .04

) The error for (2J - I )/'y0 only includes the statistical error. An estimate of the uncertainty

! hCiihapc 0f the incldcnt bremsstrahlung is not included. The ground state width ol the ,663 keV level is normalized to the value obtained by Aitkcn et al. ,0

> from the *’N(a •m'*F V

0' 6

K5±0r'

*r

' ^ValUC °f r-' flir = '- 5i<U eV [ref‘ '°)l is used » estimate the ground state branching rr0//.

"I Refs. "• >).

') Ref. ,0

).

ass.’Jm

5 Va

!se

!*;.Calcula,ed from ^c observed relative intensity at the scattering angle of 87 on the assumption that the transitions to the lower states are of pure dipole character.

10

1112.

J. H.

H. G.

K. W. 50

A.E.

Aitken et al. Phys. Lett. 30B (1969) 473.

Benson et al. Nucl. Phys. A126 (1969) 305.

Allen et al. f quoted in ref. 11. Litherland et al. Nucl. Phys. 44 (1963) 220.

form N3S-418

(REV. 7-1 4-64) USCOMM-OC 2Q010-P64 PH0T0NUCLEAR DATA SHEET 61

U.S. DEPARTMENTOF COMMERCE NATIONAL BUREAU OF STANDARDS
ref. B.J. Thomas, A. Buchnea, J. D. Irish, and K.G. McNeil

Gan. J. ?hys. 50, 3085 (1972)

method

F

REF. NO.

19 9

72 Th 5 hmg

REACTION RESULT EXCITATION SOURCE detector

ANGLE ENERGY TYPE range TYPE RANGE G , PG ABI 8- 25 C 19- 25 SGO-D DST

G,NG ABI 10- 25 G 19- 25 SCD-D DST

G rAG ABI 4- 25 G 19- 25 SGD-D DST

GAMMA DST

Table 2. Yields of gamma rays from the reaction 19 F(yjty')

Residual

nucleus

State (MeV) V* Known

7 decay

Relative yield Estimate of

f

25 d»(I50)

J dn

d£

(MeV mb/sr)

19 MeV £^ = 21.5 MeV £»- 25 MeV

9 = 90"’ 0 =.150° n SO 9 = 150° 0 = 90*’ 9 = 150° "F 0 940 3* GS 0.70 0.60 0.90 0.90 1.0 1.0 1.25 ±0.3

I .040 0* GS 0.25 0.20 0.35 0.35 0.45 ±0.11 “O 1.977 2* GS 0.28 , 0.65 0.85 1.10 0.90 1.40 1 .75 ± 0.4

3.630 0* 1.977 0.20 0.25 0.25 0.45 0.50 0.70 0.9 ±-0.2

,5 N 5.27 5/2* GS 0.07 0.09 0.45 0.35 0.55 0.60 0.75 ± 0.2

FORM N3S-418

IR ev. 7-» A* 44) USC OMM-N 0S-OC PHOTONUCLEAR DATA SHEET 62

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
IIII
t L EM . 3 Y M . R. E. Van de Vyver , H. Ferdinande, G. Knuyt, R. Carchon, J. Devos

Nucl. Fhys. A198 . 144 (1972) F 19

METHOO REF. NO.

72 Va 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,XN ABX 10-19 C 10-19 BF3-I 4PI

LWS

Fig. 3. Total photoneutron cross section a[(y, n) + (y, np)J for **F: (a) shows our results using the VBPL unfolding procedure, while (b) give* the results from a Cook analysis of the same data (the broken lines serve merely to guide the eye); (c) and (d) represent the other existing photoneutron

cross-section data.

(OVER)

N3S-418 REV. 7-1 A-«4l use OMM-O C 26010-P<54 PHOTONUCLEAR DATA SHEET 63

U.S. DEPARTMENT OF COMM5RCE

NATIONAL 3UREAUOF STANDARD'
Table I Photonuclear resonance energies observed In 1 *P

(y.p) (e, e'p) (y.T) O', n)

ref.

7) ref.*) ref. **) ref. “) ref.*) ref. **) ref. ‘*) ref. *) ref. ») ref.*) ref. *) this work

10.0 (10.1) 10.4 10.96 00.9)

(10.6) 11.0 11.4

11.8

11.42 11.4

(I 1.8)

11.56

(11.40)

(11.59) (11.72)

(11.82)

11.9 12.0 11.9 11.90 (11.90)

12.1 12.10 1X1

12.5 12.4 1X5 12.42 12.38 1X5

12.55 (12.6) (12.65) (1^8) 12.85 12.74 1X88 (12.84) (13.04)

13.28 (13.29) 13.3 13.6 14.19 14.0

13.7 14.0 14.0 14.08

13.82

14.0 (14.45) 14.6 15.4 15.41 15.8

15.5 15.715.5 15.23 15.4

16.0 16.1 16.20 16.24 16.3 16.5 16.61 16.7 16.8

17.3 17.2 17.0 (17.12)

(18.1)

(18.8) 18.7 18.7

17.91 (19.06)

18.0

(19.8) 19.5 19.3

D. King, R. N. H. Haslam & W. j. McDonald, Gan. J. Phys. 3& (1960) 1069.

Baciu, D. Gatana, G. Deberth & I. Raileanu, Rev. Roum. Phys. 12 (1967) 385*

Baclu, St. Gere. Fiz. 23 (1971) 773.

Baciu et al. Inst, for Atomic Physics report M-43-1969.

K. Sherman et al. , National Res. Council of Canada report NRC-12180 (1972).

Forkman & I. Wahl strom. Ark. Fys. 1J5. (1960) 339.

R. Dodge and W. G. Barber, Phys. Rev. 127 (196 2) 1746.

M. Murray and W. L. Bendel, Phys. Rev. 132 (1963) 1134.

Seki et al. , J. Phys. Soc. Jap. 1£ (1964) 1999.

Abe et al. , J. Phys. Soc. Jap. 25 (1968) 1507.

S. Dolbilkin et al. , Izv. Akad. Nauk SSSR (fiz. ) 3(3 (1966) 349.

Bezic et al. , Nucl. Phys. A128 (1969 ) 426.

64
R. Van de Vyver, H. Ferdinande, G. Knuyt, R. PICNS-72, p. 307 Sendai

METHOD

Carchon, J. Devos EL EM. SYM. A

F

REF. NO. 7 2 Va 3 hvm

REACTION RESULT excitation ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,XN ABX 10- 19 C 10- 19 BF3-I 4PI

Fig. 1. Total photoneutron cross section for ^7 . Our results

following (a) the VBFL method and (b) the Cook, analysis.

Previous data (c) by 3«ciu et al. (£) and (d) by King et si.

(

8)

(over)

N3S-418

iR EV. 7-1 4-64* USCOMM-NBS-OC PHOTONUCLEAR DATA SHEET 65

U.S. OEPARTMENT OF COMMERCE

NATIONAL BUREAU OP STANDAROS
Table 1. Photonuclear resonance energies observed in 1?F

(2T,p) (e >«p) (f,T U,n)

Forkman Murray Seki Abe Dodge Dolbilkin Bezi£ King Baciu Baciu Sherman This

(14) (15) (16) (lj) (9) ( 10) (8) (I) (18) (n) work

10.0 ( 10 . 1) 10.4

IO .96 (10.9)

(10.6)

11.0

11.4

11.8

11.42 11.4

(H.8)

11.56

(11.40)

(U..59)

(11.72)

( 11 - 82) 11.9 12.0 11.9 11.90 (11-90)

12.1 12.10 12.1

12.5 12.4 12.5 12.42 12.38 12.5

12.55 (12.6) (12.65)

( 12 . 8) 12.85 12.74 12.88 (12.84)

(13.04)

13 .6 13.28 (13.29) 13.3

14.19 14.0

13.7

14.0 14.0 14.08

13.82

14.0

15.4

(14.45) 14.6

15.41

15.8

15.5

15-7

15.5 15.23 15.4

16.0 16.1 16.20 16.24 16.3

16.5 16.61 16.7 16.8

17.3 17.2 17.0 (17.12)

( 18 .1)

( 18 . 8) 18.7 18.7

17.91

(19.06)

18.0

(19.8) 19-5 19.3

References

(1) R.A. Alvarez et al., Phys. Rev. C4 (1971) I673

(2) J.5. Pruitt and 3.R. Domen, NBS Monograph 46 v 1962)

(T) E. 3raman is et al., Nucl. Inatr. and Meth. 100 (1972) 59

(B) B.C. Cook, Nucl. Inatr. and Meth. 24 ( 1963 ) 256

(5) L.I. Schiff, Phys. Rev. 83 (1951) 252

(E) 3. Cook and C. Jones,Nucl. Instr. and Meth. 59 ( 1968) 229

(7) G. Baciu et al., Institute for Atomic Physics rep.M-43-1969

(B) J.D. King et al., Can. J. Phys. 36 (I960) IO69

(£) B.3, Dolbilkin et al., Izv. Akad. Nauk. SSSR (ser. fiz.) 30 (1966) 349

(10) N. Bezii er al., Nucl. Phys. A128 ( 1969) 426

(11) N. Sherman et al.,Nat. Res. Council of Can .ltRC-12l80( 1972)

(12) S. Fujii, Prog. Theor. Phys. 21 (1959) 511

(13) B. Forkman and I. Wahlstrttm, Ark. Fys. 18 (i960) 339

(15) K.M. Murray and W.L. Bendel, Phys. Rev. 132 ( 1963 ) 1134

(15) S. Seki et al., J. Phys. Soc . Jap. 19 ( 1964 ) 1999

(IE) K. Abe et al., J. Phys. Soc. Jap. 25 ( 1968) 1507

( IT) W.R. Dodge and W.C. Barber, Phys. Rev. 127 (1962) 1746

(16) 0. Baciu et al., Rev. Roum. Phys. 12 (I967 ) 385 ; G. Baciu

St. Cere. Fiz. 23 (1971) 773.

66
ref. R. Bergere, H. Beil, P. Carlos, A. Lepretre, A. Veyssiere

PICNS-73, Vol.I, p.525 Asilomar

ELEM. SYM.

19

REF. NO. 73 Be 10 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.N ABX 11- 29 D 11- 29 BP 3-

1

4PI

G.2JJ ABX 22- 29 D 22- 29 BP3-I API

A)V*

Fig. 10 Partial <J(Y,n) + a(y,pn) and

o(y, 2n ...) of l9 F.

Fig- 13 Integrated photoneutron cross-sections for s-d shell nuclei.

'orm N3S-418

(R EV. 7-1 4.641 USC OMM-N 05-O.C PHOTONUCLEAR DATA SHEET 67

U.S. OEB ARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS
=ief. D. Cat ana, G. Baciu, C. Iliescu, and V. I. R. NIculescu

Z. Physik 261, 125 (1973)

EL EM. SYM.

19

REF. NO. 73 Ga 5 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G.XN ABX 10- 25 C 10- 25 BF3-I 4PI

Fig. 6. Theoretical £1 photoabsorption cross section for 19 F (full line). Experimental

photoabsorption cross section reported by Dolbilkin [10] (points with errors). Cross

section of 19 F(y, xn) reaction (point line)

Fig. 3a and b. Penfold and Lciss solution for 19F(y, xn) cross section, a Schiff SHEET

bremsstrahlung spectrum, b FDTTB spectrum A ‘ 68

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. di Napoli, F. Salvetti, M. L. Terranova, H.G. de Carvalho,

and J. B. Martins

Phys. Rev. C8, 206 (1973)

METHOO

EL EM. SYM.

19

REF. NO.

73 Di 4 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE detector

ANGLE

TYPE RANGE TYPE RANGE G,SPL ABY THR-999 C 999 ACT-I 4PI

999 = 1 GEV

MASS NUMBER A

FIG. 3. Yields of U C and 'Be versus the mass number

of the target nucleus. Filled circle: n C, Ref. 16. Filled

triangle: U

C, Ref. 17. Filled square: lt C, Ref. 8. Open

circles: “c, present work. Reversed open triangles:

7 Be, present work.

gG. Anders son et al. , Nucl. Phys. A197 . 44 (197 2).

^V. di Napoli et al. , Nuovo Cimento 553 . 95 (1968).

^A. Masaike, J. Phys. Soc. Japan £9, 427

(1964).

porm N8S-4I8

• REV. 7- 1 4-64) USCOMM-NBS-OC

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS PHOTONUCLEAR DATA SHEET 69
pppppppp«I«

fl
±, ’n*-D

rtat

iOWeii

’ «

* ert° zzi » J * Heisenberg, S. Kawalski, X. Mamyama,

ref. ’ W” Turchinetz , C.F. Williamson, S. P. Fivozinaky,

J.W. Lightbody ,Jr. , and S. Penner

Fhys. Rev. C7, 1396 (1973)

EL EM. SYM.

F 19

METHOD

Page 1 of 3

REF. NO. 73 Ha 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE B,E/ FMF 0- 2 D 61-121 MAG-D DST

TABLE IL Elastic and inelastic electron scattering form factors for 19 F.

Level

9 (deg) * E

(MeV) b (fm" 1

)

FHq)

standard Value deviation' e Level (deg) * E

(MeV) b (fm

-1

)

FHq)

Value

standard

deviation c * 110.75 66.02 0.550 0.4352 0.00100 f“ 110.75 66.02 0.543 1.19x10"* 0.52x 10"*

(g-S .) 110.75 71.02 0.592 0.3463 0.00110 (1.346 110.75 71.02 0.585 1.84x10"* 0.45x 10"* 110.54 71.03 0.591 0.3721 0.000 94 MeV) 110.64 86.05 0.709 3.97x 10"* 0.83x10"*

110.64 86.05 0.716 0.21904 0.000 53 110.40 101.21 0.833 6.54x 10"* 0.86x10"*

110.40 101 .21 0.841 0.118 34 0.00102 110.64 121.00 0.998 10.58 xlO"* 0.60x10"*

110.64 101.17 0.842 0.117 90 0.000 91 145.82 60.88 0.580 2.14 x 10"* 0.80x10"*

110.64 121.00 1.006 0.045 09 0.000 80 145.82 73.94 0.705 3.91x10"* 1.10x10"*

145.S2 60.88 0.589 0.3993 0.00105 145.40 87.96 0.840 6.35x10"* 0.72x 10-* 145.79 68.55 0.663 0.2875 0.00170 145.79 104.59 1.001 9.80x10'* 0.62x 10"* 145. S2 73.94 0.715 0.2297 0.00117 • 163.21 85.41 0.846 6.30x10"* 1.92x10"*

145.70 74.45 0.720 0.2201 0.00132

145.40 87.96 0.849 0.112 78 0.000 89 145.79 104.59 1.011 0.04140 0.000119 ¥ 110.75 66.02 0.542 1.34xl0-3 0.12x 10"3

145.70 104.65 1.011 0.040 98 0.000102

(1.554 110.75 71.02 0.584 1.52 x 10"3 0.14X 10"3

163.21 85.41 0.855 0.11775 0 .003 84 MeV> 110.64 86.05 0.708 2.57x10"’ O.llxlO"3 110.40 101.21 0.832 2.76x 10" 3 O.llx 10 3 F 110.64 86.05 0.712 3.20x 10"3 0.44x 10"3 110.64 121.00 0.997 2.36xl0"3 0.07x 10"3 (0.197 110.40 101.21 0.838 3.52x 10'1 0J7X10-3 145.82 60.88 0.579 1.75X10"3 0.20x 10"3 MeV) 110.64 121.00 1.003 3.52 x 10"3 0.34x 10"3 145.82 73.94 0.704 2.33X10'3 0.27X10"3 145.82 73.94 0.711 3.52 x 10 •’ 0.93X lO -3 145.50 37.96 0.839 2.S5x 10"3 O.lOx 10"3 145.70 74.45 0.717 3.18x 10"J 1.02 x 10"3 145.79 104.59 1.000 2.42X10"3 0.08x 10"3 145.40 87.96 0.846 3.9Bx 10"’ 0.37x 10"J 163.21 85.41 0.844 3.41X10'3 0.26x 10"3 145.79 104.59 1.006 4.01x 10"3 0.36x 10'3 163.21 35.41 0.851 4.28x 10*3 0.78X 10"3

1 Laboratory angle.

b Laboratory kinetic energy. 'Standard deviation for statistical errors only; estimated ±2% systematic error not included.

TABLE TV. Transition charge parameters for U F.

Level B(EL, 0)f (e3 fm331

) |Af 3| (W.u.) (t3 ,)

173 (fm) <r*

ff)

l/ * (fm) f (0.197) 52112 5.7311:22 7 c* 1.08 3.6012;^

f" (1.346) 6081|3

| 9-4511:12 4.3012J2 4.i3t2;li f (1.554) 35.511;’ 5-8912:22 3.44i5;H 2.9912:25

(over)

p"

o

pm N3S-4 18 (REV. 7-14- 64) USC OMM-N as-oc PHOTONUCLEAR DATA SHEET 70

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
Page 2 of 3

Reference Reoction Tronsition Strength Wz* (0.197 MeV) 5= </j*(g.s.) '•F

9

7

4

3

2

Present

(d.d')

(p.p'J

Coul. Ex.

Coul. Ex.

(P.P'7)

(e.e') (0)

8 (E2,0)f (e2 fm4) 20 40 60 80 100 120

Im 2

I (w.u.) 5 10 IS

Reference Reoction Transition Strength 3£'( 1.347 MeV) ~ '/2 *(g.sJ ^F

9

54

5

Present

(d.d')

CcuL Ex.

Coul. Ex.

(e.e')

(e.e')

(to) B(E3,0)t (e2 fm«) 2GO 400 600 800 1000 1200

1 M2

1 (W.u.) 5 10 15 20

Reference Reaction Transition Strength 3/2*( 1.556 MeV ) — >/2*(g.s.)

I9F

8

7

S

4

5

Present

(d.d')

(p.p'J

Coul. Ex.

Coul. Ex.

(e.e')

(e ,e') ~~ (c)

I 1 I ! 1 I ! 1 1 1 1 ! 1 B ( E2.0) t (e z fm4

) 20 40 €0 60 100 120 Im

2

I (w.u.) 5 10 15 20

FIG. 4. Comparison of transition strengths for lfF levels derived by various workers, (a) 3* (0.197-MeV) level.

(b) f- (1.347-MeV) leveL (c) i* (1.556-MeV) level.

71
REF.

P

' c* pHa

^lowe11

* JJ- B «rtozzi, J. Heisenberg, S. Kowalski, X. Maruyama,

t u

W* Turchi“«tz, C.F. Williamson, S. P. Fivozinsky,

J.W. Lightbody ,Jr. , and S. Penner

Phys. Rev. C7, 1396 (1973)

method

Page 3 of 3

EL EM. SYM.

F 19

REF. NO. 73 Ha 1 hmg

. . . . . ... REACTION RESULT excitation

ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

2J.A. Becker, J.W. Olness, and D.H. Wilkinson.

Phys. Rev. 155, 1089 (1967).

6 T. Walcher and P. Strehl, 2. Physik 232 , 342 (1970).

FIG. 3. Analysis of inelastic electron scattering from

l,F. (a) (0.197-MeV) and i* (1.554-MeV) levels. •,

present data, j* level. V, present data, j* level; ordinate scaled by , data of Ref. 6; ordinate scaled by ($) l,:

. , lifetime measurement, I* level, of Ref. 2.

, modei Independent fit, j

+ level. , model Inde- pendent fit, §* level; ordinate scaled by , rotational model fit based on the measured ground-state

charge distribution and the lifetime measurement of Ref. 2. The ordinate as given applies to the j* state. Ordinates for the j* state are obtained by multiplying

the plotted ordinates by (§) t/2

. (b) §" (1.346-MeV) level. • , present data. A, data of Ref. 6. , model independent fit

form N3S-418

(R EV. 7-1 4-641 USC OMM-N 0S-OC

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOARCS PHOTONUCLEAR DATA SHEET 72
J.R. Moreira, E. Wolynec, G. Moscati

REF - PICNS-73, Vol.I, p. 165 Asilomar

EL EM. SYM.

F

A

19

z

9

METHOD REF. NO.

73 Mo 9 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,N RLY 10- 39 G 10- 39 ACT-I Ur PI E,N RLY 10- 39 D 10- 39 ACT-I A- PI

YIELD/PHOTO/ELECTRO

form N3S-418

(REV. 7-14-04) USC OMM-N BS-0 C PHOTONUCLEAR DATA SHEET 73

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
N. K. Sherman, K. H. Lokan, and R. W. Gellie

ref. PICNS-73, Vol. I, p. 167 Asilomar ELEM. SYM,

19

method REF. NO.

73 Sh 9 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE detector

ANGLE

TYPE RANGE TYPE RANGE G,N ABX 11- 21 G 13- 21 TOE-D 90

GND AND EXCIT STATE

0 Z 4 6 8 10 NEUTRON ENERGY! MeV)

Figure 1 - Photoneutron spectrum of 13 F due to lS MeV bremsstrahlung , labelled

’ T" . The numbered' curves result from

folding the photon spectrum with

0 - the ground-state cross section

(stippled); "1" - the cross section to

1 - Oh MeV excitation in 13 F. The

remainder is "2".

PHOTON ENERGY (M«V)

Figure 2 - The 90° differential cross section for (y,n) processes in 1

9

F . The

region ”0" is a(y,n ). The hatched

region "1" is a(y,n,). The region "5" results from cur/e 2 of Fig. 1 assuming

transitions to the k.7^ MeV (T = l) level

of T- 5 ?. The dashed curve derives from

King et al. 3

, assuming d -* f and d -* p transitions. The dash-dot curve assumes

p

-*• i transitions. If region "5" is due

to the 19 F(y,an) reaction, there is no disagreement

.

“OflM N3S-418 m e v . 7-’ 4-44> USC OMM-N B S-0 C PHOTONUCLEAR DATA SHEET 74

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOARDS
pppppppp«ipivii«pI
D. M. Skopik and Y.M. Shin

Nucl. Phys. A223 , 409 (1974)

El. tM. i r

19

REF. NO. 74 Sk 4 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,T ABX 18- 23 D UKN MAG-D DST

GROUND STATE

Fig. 3. Angular distributions of tritons at the two observed resonances. The solid line is the least squares fit to cq. (1).

Fig. 4. The differential cross section at 84° for E0 = 31 MeV. For Ey ^ 25 MeV non-ground-state

transitions arc possible. (over)

s opm N3S-4 18

;r ev. 7-i 4-«4> USCOMM-OC 28010-P64 PHOTONUCLEAR DATA SHEET 75

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Table 1 Integrated cross sections for I9 F in MeV • mb

Total absorption (y. *n) (y.t)

r!3odE

J i» « 170 *) 1.2

f adE

J 20.1 rcMunet

3.5 6

) v 2°) 0.1

*) Ref. J

). 6

) Ref. 9). ') Ref. l ).

Ey (MeV)

Fig. 2. The l9 F(y, t) l60 ground state differential cross section at 0^,, = 84° and 95 The solid line

in the inset is taken from the 19 F(y, .in) work of Catana et al. [ref. ')]; the dashed line is the total absorption measurement of Tessler and Stephens [ref.

9

)].

1) D. Catana et al. , Z. Phys. 261 (1973) 125

2) N. Bezlc et al. , Nucl. Phys. A128 (1969) 426

9) G. Tessler et al. , Phys. Rev. 135 (1964) B129

76
A. Veyssiere , H. Beil, R. Bergere, P. Carlos, A. Lepretre,

A. De Miniac

Nucl. Phys. A227 , 513 (1974)

method

and

ELEM. SYM.

19

REF. NO.

9

74 Ve 1 egf

REACTION result EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

* G.N ABX 10- 28 D 10- 28 BF3-I 4PI

** G,2N ABX 20- 28 D 20- 28 BF3-I 4PI

* Ml

** 880 +

Fig. 3. Photoncutron cross sections a,n and [cr(;\ 2n)-po’(;-’, pn — n)] of 19 F.

ih to/0 - 06 tt

°.;L

0.6 L

I

I 0-^1—

C.4_

o.i

I I °

0.2i—

0.1

p,

)’»• f*. pv

f *

.3a t s

20 30

I 1

I

Fig. 22. Ratio of experimental integrated photoneutron cross section <j 0

" over the Thomas, Reichc and Kuhn sum rule [0.06 \Z!A]. Numerical values and upper integration limits £„ are taken from

table 3. Also 'J<7 0

" = for all nuclei.

( over)

FORM N3S-418

«R SV. 7-1 4-«4» USC3MM.CC 26 0 1 0- P6

4

PHOTONUCLEAR DATA SHEET 77

U.S. OEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDAROS
Fig. 24. The [t7o"/(0.06 XZIA )] ratio as a function of isospin T. Possible overall errors of — 7°

0 are

to be applied to all nuclei shown.

Tadle 3 Experimental integrated photoneutron cross sections - j^M crTn (£)d£ compared with the

classical sum rule [0.06 XZ/A] of Thomas. Reich and Kuhn

T = 0 1 II

i r= §

1 T= 2| T = 3

Nucleus i 16 0

20 Nc 2s Si 22 S40 Ca 1 i o p

22 Na 27 AI j.p -K | •‘-'Sc : 10 Ar

;

5iy

ov’

j 58 42 94 98 100 103 137 15S 1S2 210 j 383 1 393 ; 60. (McV • mb) 1 ±4 ±3 ±7 ±7 --7 ±1 ±9 ±10 ±12 ±14 | ±25 1 ±28 ±42

co 7(0.06/VZ'/4) 0.24 0.14 0.22 0.21 0.17 | 0.38 0.40 0.39 0.39 0.36 0.57 i 0.66

1

1 0.J

£s, (MeV) 30 26.7 30 30 29.5 ! 29 30 30 29 30 | 28.

1

1 26 ‘

! 23

78

P

i

i

i

i

i

i

i

i

«

i

i
aer. M. Oyamada, T. Terasawa, K. Nakahara, Y. Endo, H. Saito,

E. Tanaka

Phys. Rev. Cll, 1578 (1975)

ELEM. SYM.

19

(Page 1 of 4 ) 75 Oy 1 hmg

REACTION RESUL T EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E r E/ FMF 1- 6 D 134-250 MAG-D DST

FIG. 7. Experimental squared form factors for ta) the 1.35-MeV (b) 5.43-MeV y", and (c) 5.63-MeV states

In **F. The solid curve represents the calculated C3

form factor Eq. (8) fitted to the data points for the 1.35- MeV state in the region of q < 1.3 fm-1

. From this curve

the value of B(E3) was deduced. The values of the squared form factors for (a) are multiplied by 10 in the

figure.

B(EA) 7 STATES

FIG. 8. Squared form factors for the 4.0-MeV peak which results from the excitations of the 4.00-MeV y

and 4.03-MeV states. The square denotes the data

point at £ 0 = 134.5 MeV. 0 = 135’. The C|3 and C5

squared form factors given by Eq 19) are fitted to experimental data points and shown with the solid curve (C3*C5), dotted curve (C3), and dashed curve (C 5). R = 3.2 fm, g = 1.0 fm. The dash-dotted curve represents the calculated C5 form factor for the particle-hole excitation of the doubly closed 160 core

(harmonic oscillator model, b = 1.85 fm). Vertical lines with arrows indicate upper limits of the experimental form factors.

(over)

= ORm N3S-418

R E V . 7-I4.44) USC OMM-N BS-OC PHOTONUCLEAR DATA SHEET 79

U.S. OEPARTMENTOF commerce

NATIONAL 3UREAUOF STANDARDS
FIG. 9. The CO, C 2 (j

+ -|+

), and C 4 (|

+ —

j

+

) squared form factors calculated in the rigid-rotor model using the deformed Fermi distribution with

c = 2.60 fm, z =0.527 fm, 0,= O.43, and 0A = 0.12 ± 0.2. The experimental points are as follows: CO: the ground

state (closed circles); C 2: the 1.55-MeV state (open

circles); C4: the 2.78-MeV state (triangles, after subtraction of the transverse component). The upper limit

of the experimental C4 form factor at q efr = 0.73 fm* 1

is indicated by a vertical line with arrow.

are the theoretical values calculated in the RPC model. The closed circles and upper solid curve represent

total form factors for £ 0 = 25O MeV; the dashed curve

is C4; the open circle and the dash-dotted curve are transverse £4 *M5; the dotted curves are £4 (lower) and A75 (upper). The lower solid curve shows the total form factor calculated without RPC using the same

parameters as those in the RPC case (£ 0 = 250 MeV). A

vertical line with arrow indicates the upper limit of the experimental total form factor at £ c = 250 MeV, 9 = 33’.

80
ref. M. Oyamada, T. Terasawa, K. Nakahara, Y. Endo, H. Saito,

E . Tanaka

Phys. Rev. Cll, 1578 (1975)

EL EM. SVM.

19

METHOD

(Page 3 of 4) 75 Oy 1 hmg

ION Y SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

FIG. 11. Experimental and theoretical squared form

factors for (a) the 0.197-MeV j

state and (b) the 1.55- MeV y

+ state in ‘*F. The solid curves represent the C 2 form factors squared, calculated in the RPC model. The dotted curves show the calculation of the C 2 form

factors squared, without RPC. using the same parameters of the single-particle field as those in the case

of the RPC model. The dashed curves are the total form factors including small transverse components

calculated for £ 0 =250 MeV. The experimental and

theoretical squared form factors for (a) are multiplied oy 10 in the figure. The upper limit of the experimental form factor for (b) at q err = 1.65 fm‘l is indicated by a

vertical line with arrow.

TABLE IL Experimental values of total form factors for negative-parity states in Errors are statistical only.

0 |£(<7, 9) | J x 104 (MeV) (deg) £T = 1.35 Ex = 4.0 £* = 5.43 £* = 5.63

134.5 135.0 13.8 ±3.5 1.6 ±0.8 16.3 ±2.9 7.3 ±2.8

150.0 35.0 <1.0

150.0 40.0 <1.8 150.0 45.0 <3.0 <0.39

150.0 50.0 3.0 ±1.9

150.0 55.0 3.7 ±1.2

150.0 60.0 5.9 ±2.3

150.0 70.0 7.1 ±1.5

250.0 33.0 5.0 ±1.3 <0.77 8.2 ±1.4 2.7 ±1.4

250.0 40.0 7.3 ± 1.1 <0.39 15.1 ±1.0 5.1 ±0.9

250.0 50.0 9.5 ±1.1 0.73± 0.22 16.7 ±1.6 6.8 ±1.3

250.0 60.0 8.3 ±1.5 1.54± 0.20 18.3 ±2.1 7.7 ± 1.6 250.0 70.0 5.3 ± 1.7 1.57 ± 0.18 14.9 ± 1.6 6.7 ±2.0

250.0 30.0 3.50± 0.6G 1.88± 0.22 10.7 ±1.1 3.7 ± 1.1 250.0 90.0 1.65 ± 0.39 1.44 ±0.25 6.56 ± 0.75 2.19± 0.97

(over)

po»u N3S-418

«R £ V . 7. I 4. 641 USC QMM-N BS-O C PHOTONUCLEAR DATA SHEET 81

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Page 4 of 4

TABLE L Experimental values of total form factors for posit ive-partty states in 19F. Errors are statistical only.

(MeV)

S (deg) |F(?,0) | 2 elastic £, = 0.197|f(<7,0) | 2 x £, = 1.55

104 inelastic £, = 2.78 £, = 4.56

134.5 135.0 (4.95 ± 0.46) x 10-3 14.9 ±3.1 11.3 ±3.2 8.0 ±1.6 3.8' ±1.3

150.0 35.0 (5.71 ± 0.03) x 10"* * 9.1 ±2.5

150.0 40.0 (4.56± 0.05) x 10"*

| 16.9 ± 2.7 . 2.20± 1.04 150.0 45.0 (3.88± 0.05) x 10" 1 * 17.5 ±2.8 3.21 ±0.77

150.0 50.0 (3.08 ± 0.03) x 10”'

1 20.0 ±2.2 3.37 ± 0.85 150> 55.0 (2.46± 0.02) x 10" 1 * 25.0 ±2.5 4.97 ± 0.93 150.0 60.0 (1.97 * 0.02) x 10"*

1 25.3 ±3.1 4.87 ±0.72

150.0 70.0 (1.01 ± 0.03) x 10_,

| 28.5 ±2.2

250.0 33.0 (2.26 ± 0.02) x lO-1 * 24.9 ±1.9 <0.78 5.44 ±0.58

250.0 40.0 (1.17 ± 0.01) x 10"* * 26.9 ±1.4 0.94± 0.44 4.96± 0.29 250.0 50.0 (3.01 ± 0.05) x 10-2 29 ±3 17.4 ±1.3 1.59± 0.32 4.02± 0.29 250.0 60.0 (4.85± 0.20) x 10"5 17.3 ±2.2 8.2 ±1.2 2.80± 0.31 2.31 ±0.22

250.0 70.0 (4.86± 0.75) x 10“4 4.15± 0.68 2.5 ±0.9 2.83± 0.24 1.28 ±0.17

250.0 80.0 (1.47 ± 0.48) x 10-4 1.15± 0.48 <0.55 2.84 ±0.28 1.32 ±0.18

250.0 90.0 (2.16 ±0.45) x 10*4 0.97± 0.45 0.41 ±0.22 2.14± 0.31 0.51± 0.18

1 Including the 0.197-MeV state component.

TABLE IIL Experimental values of electric transition strengths J

* — (ground state).

Present experiment Other experiments

B(E\, ») e

2 fm 2X

1 M | 2

1 M I 2 Mode (MeV) J* (e,e') (e,e') Coill. ex. (P,P‘) <d,dr )

£2 1.55 i* 24.4 ± 3.0 8.1 ± 1.0 7.84± 0.67 1 9 ± 3

b 8.4± 0.7 c 10 ±3 d

c 0.65 e O.o»-0.61 6.8 ± 0.7 f £2 4.56

2 3.1 ± 0.7 1.0 ±0.2 £3 1.35 A" (2.4 ± 0.6) x 102 11 ±3 12.4 ± 2.5 a 12 ±4 b 1.4 ± 0.6d

9.45tg;l?* 7.6± 1.3 f £3 4.00 7“ 7

<8 <0.4 £3 5.43 IT

2 (3.3 ± 0.9) x 102 15 ±4

£4 2.78

2 (9.4± 2.0) x 102 5.8± 1.3 £5 4.03

2 (2. 0± 0.9) x 104 16 ±7

1 Reference 10,

b Reference 3.

e This value was calculated using the j3 2 value and Eq. (7) in Ref. 7.

d Reference 9.

e Reference 11.

f Reference 4.

\.E. Litherland, M.A. Clark, C. Broude, Phys. Lett. 3_, 204 (1963).

4 T.K. Alexander, 0. Hausser, K.W. Allen, A.E. Litherland, Can. J. Phys. 47 , 2335 (1969).

7 C.M. Crawley, G.T. Garvey, Phys. Rev. 167 , 1070 (1968).

^D. Dehnhard, N.M. Hintz, Phys. Rev. Cl_, 460 (1970).

10

T. Walcher , P. Strehl, Z. Phys. 232 , 342 (1970).

U

P.L. Hallowell et al . , Phys. Rev. C7, 1396 (1973).

82
ref. Tsubota, No Kawamura, S. Oikawa, J. Uegaki

J. Phys. Soc. Japan 38, 299 (1975)

EL EM. SYM.

F

A

19

z

9

METHOD ‘ REF. NO. 75 Ts 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RAN GE TYPE RANGE ABX 13- 25 D 13- 26 MAG-D 90

Photo c:ross sections obtained using

isocj- I^Oohsi.

Barber's El virtual photon spectrum. CONVERTS TO PHOTO SIG

e’: *0 ==C~N ET-TRCY SPECTRA

Fig. 4. The (;•, p0 ) differential cross section at 90° for the 18 F nucleus.

Table II. Integrated differential cross sections

at 90° (MeV-mb/sr).

Fig. 2. Proton energy spectra of the ^Fte.e'ppO

reaction at 90°.

f do(r

,

po) * ' d<?(r, pi) J „

*

1 dfl d£

di? d£

1 lflp 25.39

1 .80-^0.2713.29

25.96 0.50±0.45

15.23

present work

1 *°Ne

1

25.7 ** — 1 .99 15.8 20.5 -2.23

16.4

ref. 1

ref. 2

Pig. 5. The (;•, pj differential cross section at 90° for the :3 F nucleus.

* Superscripts and subscripts are the limits of integration. ** The integrated differential cross section is calculated from total cross section assuming isotropy.

R. E. Segal et al . , Nucl. Phys . A93 , 31 (1967) . 2 N. W. Tanner et al., Nucl. Phys. 52_, 29 (1964)

.

=-orm N3S-418 REV. 7-14- 641 USC CMM-N BS-OC PHOTONUCLEAR DATA SHEET 33

U.S. OEP APTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
E. Wolynec, G. Moscati, J. R

M. N. Martins

Phys. Rev. Cll , 1083 (1975)

METHOD

Mbreira, 0. D. Goncalves, EL EM. SYM.

19

75 Wo 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE type range

G.N RLY 16- 40 C 16- 40 ACT-I 4PI

FIG. 2. Measured F for l *F(y, n). Dashed curve is a

polynomial fit to the points. Full curves are Fpw and Fm predictions.

RATIO (G,N) / (E,N)

=(HT/ZT

2 r„

2 .VT )

(w)0(Et , w, ZT ){du/u) x , (10) jSi w)(d w/w)

F'*£={Nr/ZT

2 r,2 NT )

f*

1 ' m'7

y («)<*>(£„ u,Zr )(du/u) x :

, (11) J‘

l "*ar

7 (w)^i(E1 , w,Z,)(dw/w)

form N3S-418

i R E V . 7-14- 64) USC OMM-N BS-OC PHOTONUCLEAR DATA SHEET 84

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
D. W. Anderson, R. F. Petry, H. J. Fischbeck

Nucl. Phys. A262

,

91 (1976)

ELEM. SYM.

19

REF. NO.

76 An 2 egf

REACTION RESULT excitation ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,2N ABX 20- 60 C 19- 60 ACT-I 4PI

Fig. 2. Cross section for the 19 F(y, 2n)* 7 F reaction. Vertical bars indicate standard deviations in the

cross section. Horizontal bars indicate the minimum width fer analysis of a single isolated resonance.

Fig. 3. Integrated cross-section curve for the 19 F(j\2n) 17 F reaction as a function of energy.

= 0 pm N3S-418 REV. 7-14- 64) use OMM-N BS-OC PHOTONUCLEAR DATA SHEET 85U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
J.B. Martins, O.A.P. Tavares, M.L. Terranova, and V. Di Napoli

Lett. Nuovo Cimento 1_5, 364 (1976)

METHOO

F

REF. NO. 19 9

76 Ma 10 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G ,N1

3

ABY THR-999 C 300-999 ACT1

4PI

999=1 GEV

Fig. 1. — Values of mean absolute cross-9ection jwr nucleon oj? as a function of the nominal nucleon loss (semi-logarithmic plot). Open circles: ”JU target, ref. open triangles: "Si target, ref. (*): open

rhomb: “Na target, ref. (*); open reversed, triangles: **5 target, ref. (>); open squares: *‘P target, ref. (*); filled square: “O target, ref. (’). The straight line U a least-squares fit of all the experimental points. The shaded area represents the standard deviation. Filled circles with error bars: present-work results

for “O and “F targets.

2 V. Di Napoli and M.L. Terranova: Journal Inorg.

Nucl . Chem., 36_, 3633 (1974)

3 V. Oi Napoli, G. Rosa, F. Salvetti, M.L. Terranova,

H.G. De Carvalho, J.B. Martins and O.A.P. Tavares:

Journal. Inorg. Nucl. Chem., 37, 1101 (1975)

12

V. Di Napoli, A.M. Laderenza, F. Salvetti,

S.M. Terenzi, H.G. De Carvalho and J.B. Martins:

Joural Inorg. Nucl. Chem. 35_, 1419 (1973)

16

V. Di Napoli, A.M. Lacerenza, F. Salvetti, H.G.

De Carvalho and J.B. Martins: Lett. Nuovo Cimento,

1_, 835 (1971 )

FORM N3S-418

1R EV. 7-1 4. 641 USCOMM-N BS*D C

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 86
N.K. Sherman, K.H. Lokan, and R.W. Gellie

Can. J. Phys. 54, 1178 (1976)

METHOD

ELEM. SYM.

19

REF. NO.

76 Sh 5 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,N ABX 10- 19 C 13- 21 TOF-D 90

Fig. -4. Ground-state photoncutron cross section d<r0/dn synthesized from the neutron data of Fig.

2, using the photon spectra of Fig. 3.

Fig. 5. Frrst-excited-state photoneutron cross section dai/dfl obtained from the curves of Fig. 2

after subtracting away the ground-state components. (over)

FORM N3S-418 REV. 7.1 4-541 use OMM-N as-o c PHOTONUCLEAR DATA SHEET 87

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Sineie ntnf^

mparis0n °f the sum

. of ((dtro/dfl) + (da,/dfl)) integrated over angle (solid line) with the "" (^0t line) 0f King " °L <>*»> a"d ^th the total-neutron crc«s yVCr " °L (1972)‘ The an8ular distribution is assumed to be 6 +

atot

= 10 - 66 (da/^>

9o

0

F.«vivu tiicigy k in me grouna-state cro section with observed neutron peaks at energies Tn0 and Tnl , ascribed to ground- and first-excited-state transitions. The measured resonance width is T, and the 90' branching ratio to the first-excited-state group is au'oo

k (MeV) r"Q ( MeV) Tal (MeV) r (keV) CTl/CTo 11.6 1. 10 12.10 ± 0.04 1.579 h- 0.020 0.64

12.38 + 0.04 1.842 + 0.025 0.92

(12.65) 2.10

12.79 2.24 13.29 2.71

(13.5) 13.82 + 0.05 3.22 ± 0.04 2.47

(14.2) 14.4 3.79

(15.0) 15.5 4.64

(15.7) 16.24 ± 0.05

16.6

17.6

18.2

5.49 + 0.07 4.26

(150) 200 ± 50“ 167 ± 50"

(200)

(200) (250)

250 ± 100

(300) (550)

(450)

300 ± 150

2.46

3.70

( 10 . 1 ) (3.0) (1.3) 0.85

(0 . 88) (0.75)

(2-3)

(0 . 2) 1.04

(0.5)

(0 . 6) Sherman er al. (1972).

Table 2. Approximate total integrated cross sections |aT for the principal transitions at photon energies k. The integrated 90 : differential ground-state cross section Jdcj 0,dn, the product of statistical factor g, and radiative width ri0 , and the radiative width r,0(EI) assuming electric dipole transitions, and spin parity J

are also tabulated

k (MeV)

f da0 J dn

(MeV mb sr _l

) jcT (MeV mb) f,rTo (eV) r,0(El) (eV) r

12.10 0.0334 1.21 23.1 11.6 1/2- 12.38 0.0514 2.53 50.6 25.3 1/2- 13.82 0.0505 0.98 24.4 24.4 3/2* 16.24 0.0616 1.32 45.4 45.4 3/2-

88

V
W.R. Dixon and R.S. Storey

Nucl. Phys. A284, 97 (1977)

El zv 1 i *•<

F

A

19

z

9

RE - . NO. 77 Di 4 egf

nz * : no** ExC ' - * 1 0 f. E n ;=' y

s c j r c £ CETLCrCancle

A,G LFT 6-7 D 2-4 SCD-D DST

(6.28-7.17) (2.87-3.99)

6.28-7.17 MeV

Tabu 1 Resonances in the l5 N+a system in the energy range Ea 2. 8-1.0 MeV

(keV) Er

(keV)

From 1 J N(ot, y)

,9 F*) From 15 N(ac, ct) l *N*)

ary (eV) b

) J” J*

/’(lab) (keV)

2873 ± 3 6281 ±2 1.0 ±0.2 i- i* 3 2933 ± 3 6330 ±2 0.76±0.15 i* (l*) }* 3 3060 ±10 6429 ±8 358

3146.3 ± 1.5 6497.4±1.5 1.7 ±0.3 i* 3149.3± 1.5 6499. 8 ±1.5 2.3 ±0.4 ¥*

3183 ± 2 6526 ±2 2.4 ±0.4 r i* 5 3218 ± 2 6553 ±2 0.63 ±0.1

3

i- j* 2

3267 ± 2 6592 ±2 1.6 ±0.3 i*

3511 ±3 6785 ±2 10.9 ±1.5 r j- 3 3576 ± 3 6836 ±2 1.0 ±0.2 i= * +

(} +) 1.5 3645 ± 5 6891 ±4 6.1 ±1.3 i~ i- 35

3688 ± 3 6925 ±2 9.7 ±1.4 i

4 i~ (}') 3 3770 ±10 6989 ±8 J- 64 3930 ±10 7116 ±8 i* ss 40

3993 ± 2 71 65.7 ±1.0 1.5 ±0.2 ¥*

*) This work and refs. ll - *).

") my ^HZJ+urj'r/r. Measured relative to the strength of the £x = 1.68 MeV reonance s

). *) Refs. ’• *). The ac-panicle energies taken from the elastic-scattering work (3.07, 3.78 and 3.94 MeV) have been adjusted downwards by 10 keV to correspond to the other (o,y) resonances, and

arbitrarily assigned errors of ± 10 keV.

Table 2 Branching ratios (percentages) for states (£, in MeV) in 19 F in the energy range £, = 6.3-7.2 MeV

8*- i*

0.11 i~0.20 r1.35 *-

1.46 r

1.55

l +

2.78 3.91 r r4.00 i4.03 r4.38 r

Other

6.28 14±2 4.2 ±1.0 36 ±2 26±2 20 ±2

6.33 56 ±3 17 ±2 8.5±1.5 13±2

6.50 38±2 1 4 ±2 9 ±2 14 ±2 25 ±2

6.50 55 4.65 (45 %)

6.53 29 ±2 59±3 4.55 (12±2 %)

6.55 19 ±2 55 ±4 26 ±3

6.59 13 ±2 63 ±3 24±2

6.79 15±2 39±2 13 ±2 5.3±0.8 25±2 2.6±1.0

6.84 9±5 9±5 27 ±6 10 ±7 45 ±8

6.89 9±2 < 8 < 5 61 ±5 30±5

6.93 73 ±3 22 ±2 2.4±0.5 1.3 ±0.5 1.3 ±0.5

7.17 6 ±2 94 ±2

(OVER)
Tabu 3 Angular-distribution coefficients, mixing ratios and some transition strengths for the main y-decay

branches for I9F states with £, =* 6.3-7.0 MeV

£i -* £( AilA 0

*) AJA0 *) Mixing

ratio, <5 *)

|A/| 3 (W.u.) *)

6.28 — 0 r -i+ 0.612 0.469 -0.05 ±0.07 1.9 ±0.4 (E2) — 1.35 0.468 0.000 -0.01 ±0.09 (2.0 ±0.4) x 10~ 3 (El) — 1.46 -0.350 0.000 —0.02±0.04 (1.6±0.3) x 10-» (El) - 1.55 —

}

+ -0.617 0.008 0.11 ±0.06 0.030-0.006 (Ml)

6.33 — 0.20 -i+ 0.195 0.045 —0.27±0.04 0.021 ±0.004 (Ml)

0.35 ±0.10 (E2) — 1.35 -** -0.306 0.000 —0.02±0.03 (5.4±1.1) x 10-* (El) - 1.55 0.510 -0.367 0.00±0.14 2.8 ±0.6 (E2) — 4.38 0.443 -0.001 0.04±0.20 0.22 ±0.05 (Ml)

6.50 - 0 r-r -0.396 —0.06±0.04 0.056±0.010 (Ml)

or 2.00±0.17 9±2 (E2) — 0.11 -0.507 0.00±0.03 (9 ±2) x 10-* (El) — 0.20 -r 0.320 0.3 -1.8 0.003-0.014 (Ml)

0.3—2.4 (E2) — 1.35 -r -0.236 -0.11 ±0.09 (1.8 ±0.4) X 10~ 3 (El) — 1.46 0.400 0.00±0.07 (3.4±0.7) X 10- 3 (El) 6.53-0 r-t* -0.915 0.32±0.04 0.053 ±0.009 (Ml)

or 0.90±0.06 5±1 (E2) — 0.11 -0.510 0.00±0.Q2 (5.4±0.9) X lO" 3 (El) — 4.55 -r -0.368 -0.23±0.13 20-220 (E2) i*-*+ -0.371 0.000 0.01 ±0.07 0.43 ±0.10 (Ml)

6.55 —0.20 }

-* -0.414 0.001 0.03 ±0.05 — 1.35 -0.371 0.000 0.01 ±0.03 — 2.78 -r -0.088 0.000 0.05 ±0.07

6.59 — 0.20 i*-t+ 0.633 -0.046 —0.13±0.13 1.6±0.4(E2) — 2.78 -r 0.584 -0.022 —0.20±0.20 ai7±0.04 (Ml)

-4.38 -*i+ -0.369 0.000 0.02±0.07 0.35 ±0.08 (Ml)

6.79 — 0 -0.348 -0.08 ±0.03 (5.4±1.0) X 10- 3 (El) — 0.11 -0.670 0.11 ±0.02 0.33 ±0.05 (Ml)

0.8 ±0.3 (E2) — 0.20 -r -0.044 0.05 ±0.06 (5.1 ±1.1) X 10~ 3 (El) — 1.46 -r 0.594 —0.13±0.08 0.43 ±0.07 (Ml)

6.84 — 0.20 i -r 0.760 -0.078 -0.5 ±0.5 — 1.46 -0.359 0.000 -0.02 ±0.11

6.89 — 1.35 0.296 0.22-2.2 0.09-0.50 (Ml)

6-120 (E2) — 1.46 0.165 0.1 5 ±0.12 0.26 ±0.07 (Ml)

6.93—0.20 i~ -*• J* -0.328 0.000 -0.01 ±0.03 (1 2±2) x lO" 3 (El) — 1.35 **- -0.371 0.000 0.01 ±0.02 0.1 5 ±0.03 (Ml) — 2.78 -r -0.172 0.000 0.00±0.16 (1.7±0.4) x lO' 3 (El)

*) The experimental angular distributions are fitted to Ao-t-A 2 Q2P2 +A^QiJ

>*, where P2 and P*. are the usual Legendre polynomials, and Q2 and Q* are attenuation coefficients giving the effect of

the finite solid angle of the detector (typically 0.90-0.95 and 0.78-0.83, respectively). The fitting procedure requires minimization of x

1 with respect to the mixing ratio <5, of which and AJA0 are known functions.

”) The phase convention is that of Rose and Brink I3

). The 68 % errors are assigned by the (**+!)

rule or by the "external-error’’ method 2A

), whichever is larger.

c

) Weisskopf units as defined by Wilkinson J3).

90
V. Di Napoli, J. B. Martins, G. Rosa, F M. L. Terranova and H. G. De Carvalho

J. Inorg. Nucl . Chem. 40_, 1619 (1978)

RCF. Salvetti, 0. A. P. Tavares

METHOD

ELEM. SYM.

F 19

REF. NO. 78 Di 10 hg

REACTION RESULT EXCITATION ENERGY

SOURCE detector

ANGLE

TYPE RANGE TYPE RANGE

G,cn ABY 33( 33.08) -999 C 300-999 ACT1

4PI

G,Be7 ABY 30 (30. 63) -999 C 300-999 ACT-I 4PI

Abstract—Mean cross sections for the photoproduction of ’Be and "C from '’F,

17 AJ. 3

Si and l: S targets. Be from 999= 1 GE V iajl 3. and "C from

!4 N and '*0 targets have been measured using bremsstrahlung beams in the energy range

0.3— 1.0 GeV. The results have been compared with previous measurements and an excellent agreement has been

found. In most cases, the values obtained turned out to be much larger than those expected from a simple

spallation mechanism. A fragmentation and/or a fission-like process has been suggested in explaining the mechanism of such reactions.

T-T T-r-T

2COfry*' "cl-. "a—vir. -

Fig I Mean cross section-, per photon, it,. of "C pho'oproduc

lion vs the target mass numoer A,. Experimental data are taken from: • Ref [9|; C. Ref- (13). , Ref. (2). O. present work The straight line is a least squares fit of the experimental points.

Fig I. The same as in Fig. I for ’Be photoproduction Experi- ment! data are taken from k . Refs. [6, "I; V . Ref. (SI. O Ref.

(9|;c\. Ref. (10); . Ref. (111. . Ref ( 12(: d . Ref. [I?|. 3- Rif

[ 14]; O. Ref. (21. O, present work.

Table I. Cross sccrions per equivalent quantum of "C photoproduction

c"o (GeV!

,4Y

,S 0

Cross Sec tion. a

3 27

a,

(ufl)28

si 32

S

35 .37

c , ox 5X:X 200 : 20 T 10: X 28:10 35:10 45:10 X: 10 3.32 520:30 210:20 1X:X X: 10 42:10 50:10 X: 10

a. 25 530eX 2X:20 1 25:X 38:10 45:10 60:10 40:10

0.40 SXeX 2X:X IX:X 42:10 52:10 66:10 50:10 0.18 550:30 255: 20 1S0:X 60:10 X: 10 X:!G 60:10

3.55 570: X 250: X 160:X 60:10 78:10 85:10 50:10

0.65 60O:X 290:20 180:X X: 10 85:10 98:10 75:10 0.75 620:X 200: X 180:X 79:10 95:10 110:10 3S: 10 0.90 650: X 3X:X 190:X 90:10 110:10 1 X:10 95:10

1.00 680:X 2X:X 21C:X oo o 115:10 125:10 100:10

Table 2. Cross sections per equivalent quantum of "Be photoproduction

£ o (GeV) i°.n

3

Cross Section, Oq

.6, 19,

(ub)27

a, 28

Si 32S

0.30 1 50: X X0:X 1 13:X 152:X 40: X X:X 50: X

0.32 160: X X0:X 1 X:X 150:X 45:X X:X 54: X

0.35 IS0:X 210: X !X:X !59:X 42: X X:X 60: X

0.4O 175:X 22S:X 145:X 1X:X 98:X X:X X:X

0.43 190: X 245:X 163:X 1 86: X 100:X 50:X I40:X

0.55 200: X 260: X 137:X X0:X 93:X 48*X 90: X

0.65 2X:X 280: X 197: X 214:X 1 40: X 68:X 1 X: X

0.75 225: X X0:X 215:X 227: X 1X:X X:X 133:2) 0.90 240: X 318:20 2X:X 245: X 1 86: X 8S:X 165:X

1.07 ’50: X 3X:X 24 2: X 260:X X0:X 97:X !9C:X

FORM N3S-418

(REV. 7-1 4-641 use OMM-N 85-OC PHOTONUCLEAR DATA SHEET 91

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOARCS
Table 3. Comparison bewets experimentally determined and calcuiaxed cross sections of ’Be and "C photoproduction and indication of the dominant reaction channels

T«r9»C

SucIt'JS

Product

luclev*

Horn . 14 1 lucleon

Loll,.* A

4S/»

t (.10.1) W»(Ul>) ®a*o <**> gtxP *a»©

Apparent

Threshold

<E*P.)

Possible

.Mechanise of

Procue Cion

lO.ltj 7«. (3!- (33). 36 SI 28 2 < 50 Spallation

7a. S *2 110 2D s <50 Spallation

>s

7a« 7 so 108 12 9 < 50 Fission Spallation

'S "c 3 21 130 60 2 < 50 Spallation

70* 9 56 107 3 13 50<E„.2C0 w

Fission Fri^rentation

,s o "c 5 31 117 33 3 <50 Spallation

,S F

7b. 12 63 106 s 21 Fission Provocation

'V "c a 42 IQS 16 7 SO^^.JOO

Fission Fraanencation

Spa! lotion ”n 78e 2D 74 U2 2 71 > 2C0 Fra yen cat ion M

c 16 59 70 5 14 50<Cy,«2W Piss* on Fray-rC »Cior

28

s,

78. 21 75 56 2 28 > 200 Fra yen tat’ on

»Si "c 17 61 68 4 17 so.t^.no Fits id* Frayant^cion

78e 25 78 114 2 57 » 2C0 Prayer, to tier

“s "r. 21 66 68 3 23 SO.C^.JDO Fission

Fra yen cation

3S.37

C , "c 2*. (26) 63.(70) 59 3 20 so.E^.aso Fission

c ra£ emotion

40 C<78. 33 33 70 1 70 > 200 Frcgr-n to ti 00

"c 29 73 70 2 35 > 200 FretyentJCicn

( *) Mean «alue« or the 1> f fervit scaturements (see Figs. 1 and 2).

Calculated values according to &ef. Q5] .

92
T.J.M. Symons, L.K. Fifield, M.J. Kurst, F. Watt, C.H. Zimmerman

and K.W. Allen

J. Phys. G 4, 411 (1978)

ELEM. SYM.

19

REF. NO. 78 Sy 2 rs

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

A, G LFT 8- 10 D 5-8 SCD-D 55

Abstract. The l5 N(s,y) l9 F reaction has been studied for j-particle bombarding energies from 5-2 to 8-4 VleV using a differentially-pumped gas target. Forty-two resonances have

been identified in the gamma ray yield, of which 32 have been observed to decay by gamma emission to known states in l9 F. The remaining ten resonances were found to

arise from the 15 N(s, a'y)

lJ N and lJ N(3,py) ls O reactions. Decay schemes, widths and

values of or/ have been measured for many of these states. The data obtained are compared with previous published work on the l9 F nucleus.

Resonance £* Relative intensities V.)

JC 10365 "I " 11

1 TM 4—71 |

:1 —35:

-

! *9 . 2 760

?9 99?7

'

tl — 54 >2

2 3 q*77 V

’

tl — 24

1 'J T

1 — 34 i 1 — 11

1"

L J., i 1

1

24 9580 3*. 71 qfiV 5—36 ^

j

- -

?? c642 — :3 — 61 :2 — 17J 2—11

u

. "

«

1 " X 1

17 9320 29 3 — 21 -3 ! :3 — 42 -3

14 9204 18

1 1 i

1 ”

5’ * 7 " — x, l |

1

f „ :2 — 10

r ‘j” oL, 20*2

'

J.s 1 T 1 1

1

i

1

l ;2 — 91 ”

. 1

:2 — 5 •1 — 6 tl — 3 O ~T 7

i2 — 24 •2-39

’

i m — L u f 30-3 1 -flr-3 i

3 8306 9 .7 30.3 | 10.3 a

i i n i i i i j /. 5

J*

11

* 0 197FFFFFFrfr 1346 1459 1554 2760 3907 3999 4032 4373 45

i 58 4648 4681 54 f ’? f

21 54

’

64 60

7*7

70 6330 64

r

98r

Figure 6. Relative intensities at 55’ of the decays of resonances observed in the 15 N(a,y) 19 F reaction. over

"opm N3S-4 18 iREV. 7-14- 641 USC OMM-N BS-OC PHOTONUCLEAR DATA SHEET 93

J.S. DEPARTMENTOF commerce

NATIONAL BUREAU OF STANDARDS
Table I. Properties of capture resonances.

Resonance £* (keV) E, (keV) T (keV) or/ (55) (eV) J

'

2 8288 ± 4 5415 ± 5 <1 0-58 ± 01

3 8306 ± 4 5439 ± 5 <1 21 ± 0-5 5 +

J 4 8370 ± 4 5520 ± 5 7-5 ± 1-5 0-54 ± 0-2 7 5-*- 1» 1 5 8579 ± 4 5784 ± 5 - 1 5-1 ± 1-3 57 6 8587 ± 3 5794 + 4 21 ± 0-1' 1-6 ± 0-35 l 7 8629 ± 4 5487 + 5 <1 2-5 ± 0-4 7>

7

8 8864 ± 4 6145 ± 5 <1 0-2 ± 005 <!

9 8953 ± 3 6261 ± 4 -1 085 ± 02

10 9030 ± 5 6356 ± 5 4-2 ± 1 053 ± 026 U 11 9098 ± 4 6442 ± 5 0-57 + 0-03* 0-48 ± 015 7 + I

12 9101 ± 4 6445 ± 5 -1 0-40 ± 01 7 9

7. 7

13 9165 ± 5 6526 ± 6 9-9 ± 1-5 1-4 ± 1 U 14 9204 ± 7 6576 ± 6 10 2 ± 1-5 15 i

15 9267 ± 4 6656 ± 5 2 ± 1 015 ± 004

16 9280 ± 5 6672 ± 6 <1-5 038 ± 009 i> f 17 9320 ± 4 6722 ± 5 3-4 + 1 3-4 ± 1-7 r

18 9329 ± 4 6735 ± 5 -6 — <i

19 9509 ± 4 6963 ± 5 <1 07 ± 02 S

9- 7 +

7 » 7 20 9533 ± 6 6993 ± 7 6-3 ± 1-5 05 U.J

21 9584 ± 4 7057 ± 5 9-6 ± 1-5 5-2 ± 3

77 22 9642 ± 6 7131 ± 7 '8 -l li

23 9654 + 6 7146 ± 6 ~6 - 2 11

24 9680 ± 6 7179 ± 7 -4 -1 1 25 9710 ± 4 7217 ± 5 <1 4 ± 07

26 9814 ± 4 7349 ± 5 <1-5 3-5 + 08 r

27 9834 ± 3 7376 ± 4 <1 051 ± 01

28 9872 ± 3 7422 ± 4 — 1-5 3-6 ± 06

29 9926 ± 3 7491 ± 4 - 1 19 3 ± 30 9>

7 30 10088 ± 5 7696 + 6 <1-5 2-37 + 05 },}

31 10130 ± 6 7749 ± 6 3-2 ± 1 1-3 ± 04

34 10365 ± 4 8047 ± 5 3 ± 1-5 09 ± 04

35 10411 + 3 8105 ± 4 <1-5 15 0 ± 3 0

J These values are from the measurements of Yagi (1962).

Yagi, K. 1962, J. Phys. Soc. Japan 17, 604.

94
REF- C.F. Williamson, F.N. Rad, S. Kowalski

J.T. O'Brien, and H.C. Lee

Phys. Rev. Lett. 40, 1702 (1978)

METHOD

J. Heisenberg, H. Crannell,

ELEM. SYM.

19

78 Wi 2 rs

REACTION RESULT EXCITATION ENERGY

SOURCE DETECT O R ANGLE

TYPE R AN GE TYPE RANGE E,E/ FMF 0- 5 D 1*3 MAG-D DST

Cross sections for the electroexcitation of the ground-state rotational band in lS F have Q

=0 . 5-2

.

5FM-1

been measured over the momentum transfer range 0.5 -s q $ 2.5 fm* 1 and are compared

to calculations based on the variation-after-projection, Hartree-Fock approximation.

The data support the predicted predominance of L • S coupling for this band. The 5464- keV level is unambiguously identified as the •p’ member of the ground-state band.

FIG. 1. Squared form factors for elastic scattering

in 19 F. Solid circles, present data; crosses, data of Ref. 1; inverted triangles, data of Ref. 2; solid line, VPHF calculation.

^M. Oyamada , T. Terasawa, K. Nakahara,

H. Saito, E. Tanaka, Phys. Rev. C

Y. Endo,

1578 (1975).

over

- o rm H 3S-4 18 R E V . 7- 1 A- 641 use OMM-N BS-OC PHOTONUCLEAR DATA SHEET 95

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
FIG. 2. Squared form factors for inelastic scatteringin 19 F. Circles and triangles, present data; crosses,

data of Ref. 1; inverted triangles, data of Ref. 2; solid

line, VPHF calculation including both longitudinal and transverse magnetic components; in B and D the magnetic components are predicted to be negligibly small; dashed line, VPHF calculation including longitudinal

components only.

V.L. Hallowell , W. Bertozzi , J. Heisenberg, S. Kowalski,

X. Maruyama, C.P. Sargent, W. Turchinetz, C.F. Williamson,

S.P. Fivozinsky, J.W. Lightbody, Jr., and S. Penner,

Phys. Rev. C 7, 1346 (1973).

2M. Oyamada, T. Terasawa, K. Nakahara, Y. Endo,

H. Saito, E. Tanaka, Phys. Rev. C 1J_, 1578 (1975).

96
" CF - J.E.M. Thomson and M.N. Thompson

Nucl . Phys. A330 , 66 (1979)

METHOO

EL EM. SYM. A

19

ner. no. 79 Th 1 hg

reaction RE5ULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,PG ABX 14-30 C 14-30 SCD-D 150

G,NG

G,AG

Abstract: Cross sections and integrated cross sections for photodisintegration of '*F to excited residual DE-EXCIT 6-RAYS

states following emission of protons, neutrons and x-particles have been measured. The size of the photo-x cross sections appear to be too large to be explained by a semidirect reaction mechanism.

E NUCLEAR REACTIONS I9 F(y, n), l, F(}\ p), ’’Ffy, x), bremsstrahlung fM1 = 14-30 MeV; measured a, ]’<xd£, de-excitation y-rays. '*F, "O, l3 N deduced levels, J, it. Natural

target.

Table I

Cross sections integrated to 30 MeV for photoreaction in '"F leading to the levels indicated

Level (MeV)

J'. T JT(s).-“

this work (MeV mbisr) nsL“

ref. *) (MeV mb sr)

Rel. strength following

irradiation with

14 MeV

bremsstrahlung ')

'*0

1.982 2*. 1 1.6 ±0.2”) 1.75 1 58 ± 1

0

3.553 4*. 1 <0.1

3.632 0*. 1 0.4 ±0.2*) 0.90 38 ± 1

1

3.919 2*. 1 0.2 ±0.1 *) 4.448 • 1", 1 0.6 ±0.2 c

) 20 ± 10

IS F

0.936 3’,0 1.0 ±0.2 ’•J 1.25 1.042 0*. 1 0.9 ±0.2*) 0.45

1.081 O’.O 0.2 ±0.1 “) 1.128 5*. 0 7

1. 70

1

r.o <0.05

2.101 2". 0 <0.1 c

) 2.524 2". 0 SOW 4

) 3.059 2\ 1 0.3 ±0.15 c

) 3.135 r.o 0.3 ±0.1 c

) 4.739 3*. 0 0.07 ±0.02 c

) n N

5.270 0.1 ±0.03*) 71 +2

5.270 3

*>

f <r+n 0.33 ±0.1 3*) 0.75 184-1-6 5.299 J

*) Evaluated by direct integration of cross section.

*) Evaluated from yield at 30 MeV.

*) Evaluated by comparing the strength of the peaks to that from 1.98 MeV level in l8 0 in summed

spectrum.

form N3S-418

in EV. 7-1 4-Ml

(OVER)

U.S. OEPARTMENTOF COMMERCE

NATIONAL BUREAUOF STANOAPOS

USC OMM-NSS-OC PHOTONUCLEAR DATA SHEET 97
l, F(y. n). (y, p). (7. j)

EXCITATION ENERGY (MeVI

fig 3. cross sections for photoreactions in '*F leading to the emission of the de-excitation y-rays

indicated. No corrections for feeding from higher states has been made to those data.

P

P

P

i

P

P

P

P

I

I

I

I

I

I

98
J.R. Calarco, P.M. Kurjan, G.A. Fisher, S.S. Hanna

Phys. Lett. 92B_, 67 (1980)

EL EM. $YM. A Z

METHOD

F

REP. NO.

19 9

80 Ca 4 hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

$ P,G ABX 15-23 D 3-10

NAI-D QST

$ POLARIZED PROTONS

The striking intermediate structure observed in the giant El resonance of 20 Ne has been studied with the polarized and

unpolarized 19 F(p, 7o) 20 Neireaction. A heuristic model of four intermediate doorway resonances is found to fit the data.

E y (MeV)

IS 18 20 22

Ep (MeV)

Fig. 1. Shown from the top to bottom are the observed differeniial cross sections of 19 F(p. 7o)

20 Ne at 90° along with the

angular distribution coefficients discussed in the text.

E y (MeV)

16 18 20 22

J

1

J

fl 1 |

i

1 r- A

l9 ^P>Xo^

/ \ \ A A

°’T0T

0

fig. 2. Shown from top to bottom are the extracted total

(p, 7q) cross sections, the 1 P and 3 P amplitudes, normalized

so that l 1 Pi

2 + I 3

PI

2 = <j(p, 7o), and the relative phase. To

keep the plotted values of these phases between err they are changed by 2rr at the discontinuity. Indefinite values are indi- cated by the vertical double arrows. The top curve is simply drawn through the points. The other curves are fits obtained

with the four-resonance model discussed in the text.

row N3S-418

IR EV. 7-1 4.S4I USCOMM-NSS-OC PHOTONUCLEAR DATA SHEET 99

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
" er‘ M. Yagi , R. Amano

Int. J. Applied Radiat. Isotopes 31_, 559 (1980)

EL EM. SYM. A

19

METHOD REP. NO. 80 Ya 2 hg

REACTION RESULT EXCITATION ENeRGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,F18 YLD THR-60 C 30-60 ACT1

4PI

The ^roduai00 rates of ,8 F by the 2 °Ne<y, pn) 18 F plus 20Ne<y. 2n) 18 Ne - "F. 2J Na(y, on) 1

8

F, and

(,.n) F reactions Acre determined as a function of the maximum bremsstrahlung energies between

30 and 60 MeV. In addition, a simple and fast method to prepare anhydrous H

18 F was studied by using KHF2 target. 6

Taule I. Photonuclear reactions for l8 F production

Target nuclide (abundance. Reaction type Threshold energy (MeVi Product nuclide

20 Ne 190.51) (y. 2/0 28 50 ,8 Nc — 1

8

F

2l Ne(0.27) ly. 3/t) 35.27 18 Ne — 18 F

22 Ne (9.22) (y. 4/i i 45.63 ,a Ne — ,H F ;0 Ne (90 51

)

(y, pm 23.26 1

8

F

21 Ne (0.27) (V. pin) 29.93 ,8 F

22 Ne (9.22) (•;. p3/o 40.38 1

8

F

23 Na (100) (v. xn) 20.89 1

8

F

i8 F (100) (y.n) 10.43 1

8

F

Fig. I Production rates of ' "F on Ne. Na and F targets as

a function of the maximum bremsstrahlung energy.

FORM N3S-418

<R EV. 7-1 4- 641 USC OMM-N B3*0 C

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDAROS PHOTONUCLEAR DATA SHEET 100
R

A=20

R

I I

s III II I

I

I

j 1

1

II 1 1|| I h

I

R

1

R

R

I

R

a

a

a

I

a

a

a
102
REF- I. Bergqvist, J. A. Biggerstaff, J. H. Gibbons, W. M. Good

Phys. Rev. 158 . L049 (1967)

EL EM. SYM.

20

METHOD REF. NO.

67 Be 7 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

N,G LFT 6-7 D 0-1 NAI-D 0-7 90

Table I. Gamma ray* from l*F(f»,ir),,F; 27 IceV, Jr —2~. SOURCE 27.50 KEV

Iy (per 100 £, (MeV) captures) Assignment -* J/w IS, (meV) loooijfr

5.98 6±2 C - 0.65 2~- (2,3)* 65 0.6 5.31 32±2 C — 1.31 2“- 2- 350 4.6 4.66 50 at 2 C — 1.97 (C — 1.85) 2- — ?, (2~ — ?) 550 11 (4.09)* (4) (4.08 — 0) [(0,1)- -r: 3.5 4dr2 (3.5 — 0)

3.1 8±1 (C — 3.55, 3.49, 3.59) (90) 2.60 5±2 C — 4.08 [2- - (0,1)-] 55 6 1.98 8±3 1.97 — 0 ? — 2-

1.85 15±4 1.85 — 0 ? — 2 -

1.32 57±2 J1.31 —0

\

1.97 —0.65

/ 2- — 2- \? —* (2,3)-

1.15 16±2 1.97 — 0.83 ? —• (1-2,3)-

(0.95)* (4) (1.06 — 0, 0.99 — 0) 0.84 4±2 0.83 — 0 (1,2,3)- — 2-

0.65 ~30 0.65 — 0 (2,3)- — 2-

• Parentheses imply marginal credibility.

Table II. Gamma rays from l, F(»,-y)*F; £«=50 keV, /'=!“.

Ey (MeV)

(per 100

captures) Assignment // — Jfr rTi (meV) 10001 #!*

6.60(?) 5z±=3 C — 0 1 - — 2+ 80 0.6

( 6.0 9 i C — 0.65 1“ — (2,3)- ~140 ~1.3

( 0.83

5.6 04 04 4— It04 C — ( 0.99 (~200) 1.06

(, 5.35 12 J C— 1.31 1 -— 2+ ~190 ~2.5

4 60 4.2 -± 2

/ C — 2.05 1-- (1,2,3)- 670 14

\ (C — 1.97 weak)

3 7 } f (3.59) 35 j

1 3±3 ( 3.53 —0

l (3.49) 3.09 20±2 (C — 3.59, 3.53) (320) (3.591 ( 1.06)

2.5 — 2.6 7 ±3 i 3.53 \

f 0.99 J-

{ 3.49 I [ 0.83 J 2.1 8=3 2.05 — 0 (1,2,3)-— 2-

1.9 6±3

( 2.05 — 0.65 (1,2,3)+ — 2-

1.38 37=4=3 J (1.31 —0) b [2- — 2-][? — (2,3)—

]

b

l (1.97 — 0.65)

[ 1.15 3±2 1.97 — 0.83 * 1.06 7±3 1.06 — 0 ( 0, 1 )-— 2+

' 0.9— 1.0 6±3

0.65 >30 0.65 — 0 (2,3)+ — 2+

Unresolved structure. b Parentheses imply marginal credibility.

U.S. OEP ARTMENT OF COMMERCE FORM NB5-4IB NATIONAL BUREAU OF STANDARDS

(REV. 7-1 4-841 USCOMM-OC 2S0I0-PS4 PHOTONUCLEAR DATA SHEET 103
'

104
NEON

Z=10

Neon (Greek neos, new) was discovered by Sir William Ramsay ( 1852-1916),

and his assistant Morris William Travers. Argon and helium had been

discovered with atomic weight of 40 and 4 respecti vely; Ramsay thought

there might be an intermediate gas with an atomic weight of 20. Ramsay

and Travers tried, unsuccessfully, to find this gas by heating rare minerals. The rare gases could not be detected by chemical means since

they are inert and they could not be detected by spectroscopy because of

their high dilution in air. It was first necessary for them to remove the

carbon dioxide, oxygen, and nitrogen by chemical means. Next they

liquified and then solidified the argon by surrounding it with liquid air

under reduced pressure. They then allowed the argon to volatize and

collected the portion that distilled off first. The vacuum tube

containing this volatile fraction of gas was subject to the Plucker tube

for spectroscopic analysis. The blaze of crimson light (now so familiar

to us as the light from a neon tube) convinced them that they had

discovered a new gas.

N*

105
I

I

106 I
REF- G. Ferguson, J. Halpern, R. Nathans, and P.F. Yergin

Rhys. Rev. 95, 776 (1954)

ELEM. SYM.

Ne 10

METHOD

54 Fe 1 rs

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,SN ABX 10-25 C 11-25 BF3-I 4PI

The direct detection of neutrons from (y,n) reactions induced by betatron bremsstrahlung has been

applied to cross-section determinations using gaseous targets at approximated 100 atmospheres pressure Results from oxygen are consistent with other determinations. The remaining elements represent new

results and stow the familiar giant dipole resonance for the photoneutron process. Parameters of the reso- nances are aetermined and related to the systematic behavior previously reported for other elements.

Fig. 8. Photoneutron excitation function for neon.

'Horsley, Haslam, and Johns, Phvs. Rev. 87, 756 (T952). 'R. Nathans and J Halpern, Phys. Rev. 92, 940 (1953).

"09M N3S-4 18 SEV, 7-14- 64 1 JSC OMM-N BS-D c PHOTONUCLEAR DATA SHEET 107U.S. JEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
D . Reagan

Phys. Rev. .100, 113-120 (1955) Ne 10

METHOD

Llnac; counted delayed neutrons from N

17

REF. NO. 55 Re 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G ,N 17 AB1 THR - 400 C 90-400 ACT -I 4PI

Fig. 4. Experimental N' n activation points for neon and sodium

arc plotted in the upper graphs. The lower graphs are the photon

cross sections, which were calculated as indicated in the text. The activation cross sections indicated by the solid lines are reconstructions from the photon cross sections shown. The photon

cross sections for energies below 80 Mev were chosen arbitrarily.

form NSS-413

(R EV. 7-1 4-«4) USCOMM-OC 2S010-PS4

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS PHOTONUCLEAR DATA SHEET 108
Ref. A.P. Komar, I.P. Iavor

Zhur. Eksp. i Teoret. Fiz. _^2, 6l4 (1957)

Soviet Phys. JETP 508 (1957)

Elea.- Sym.

Ne

Ref. No. 57 Ko 1

10

Method Cloud chamber at 1.4 atm; 80 MeV synchrotron

EGF

Reaction E or AE <7d E J

rr Notes

| Ne (Y,p)

Ne(Y,pn)

Ne(y, 2p)

Ne(Y,2a)

' Ne(y,ofp)

Ne(y,5a0

Bremss

80

For E

p (l-15 MeV), -^ = ad-b sin2

9,

b/a ~ 2.5

a, v= 0.l6±0.08 MeV-b based on

(t,p)

Gaerttner and Yeater [Phys. Rev. 85.

146 (1951)].

j (*,/»)

[ The number of observed cases for the asperate-

| types of rsactio— is as follows:

I

- n

j Type of

j' disintegration: (yp) (ypn) (y2p) (y2ol (yep) (y5aj£

! Number of cases: 352 137 64 21 145 2

J !

'

- - porm NBS-418

( 8 * 1-6 3 ) USCOMM-OC 18558-P83 PH0T0NUCLEAR DATA SHEET 109

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS
Ref- W. R. Dodge, W. C. Barber

Pfcfs. Rev. 122, 17^6 (1962)

Page 1 of 2

Elem. Sym.

Ne

Ref. No. 62Dol

10

Method Magnetic analysis of proton spectron produced by eletron bombardment BG

Reaction E or A E <7d E J

tr Notes m

18-30 3.20

3.70

4.58

5.80

6.65

7.75

8.65

9.^0

11.1+0

( see Table V)

0.50

0.58

0.5^

0.1+9

11 .

1+ 11.1

7.6

6. l (see Table VI) *

27

65 -10^

16

Calculated assumf

ing 100$ ground

state transition^

Correspondence between (e,pe')

reaction and (7, p) react ion;

assumed electron has associated

with it a virtual photo spectrum.

Electron production yields analyzed

by use of El virtual photon spectrum

to obtain S’ (7,p)

.

Angular distribution of proton

measured.

Target 90.9$ Ne^

Angular distribution of proton

produced by photon assumed to be

A' + B' cos 0 -f C* sin 0 + ...

Tabus VT. Summary of the properties of the major Ne peaks.

Proto* Photon

of peek of peak (j£v7

Photon J'»{y.t)dEy Peak width under

height at half- resonance

at 76* height curve „ /•» ,

. (mb/ar) (MeV) (MeV-mb) •(t.tM&y A38 17.70 1 .45 0.50 11.4 3.SO 13.87 1.11 0.58 11.1 &M 19.87 0.90 0.54 7.6 hi* am a 77 0.49 6.1 Total 34.2 T ' b tE \ . Summan of the natation characteristics of the \e protons.

19.0

16.7

12.7

10.3 5A9

Ground state Proton transition

enerjo- energy (MeV) (MeV)

Experimental

threshold (MeV

»

Electron energy at which

a deviation from an El isochromat

occurs (MeV)

4.56 17 6vS 17 7 -*-0,3 5 20 18.35 19 4*0 6

5.57 18.74 19.5*0.7

5.81 18 99 19.6-4-0 6

6.74 19.97 20.0*0 4

7.22 20.47 20.4*04

7.77 21.00 21.4*0.5

8.30 21.61 21.9-4-0.5 8.72 22.05 22.3*0.5

9.20 22.56 23.0*0.6

9.49 22.86 23.0*0.5 986 23.25 23.6*0 6

Branching

ratio (%)

Energy of excited state (MeV)

21.8=0.5

21.8*0.7; 27. 8_,

29.8*1

26 0*1

26.5=1

28.2 = 1.5 27.6*1.5*

17=8

5*5; 39* 10

26*10

29*10 29*10

29*10

4. 1=0.5 3.5*07; 9.5_ l *1

8 . 8*1

4.4*1 4.5*1

5.2*1.5

4.7*1.5*

• Shffu evidence. (See page 2 for figures)

form NBS-418

(8-1-83) USCOMM-OC I8S38-P83

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OR STANDARD*

PHOTONUCLEAR DATA SHEET 1 ] Q
a

t

«

1

E

a

a

»]

a

a

a

a

a

n

FORM NBS-418 U.S. DEPARTMENT OF COMMERCE

(S-l-fl3> NATIONAL BUREAU OF STANDARDS

USCOMM-OC 18SS8-PS3

Reaction Notes

"»OTO* CN£*«T («*CVI

E 5.00 ME

Oiwin a

35. N’eon (e.p*') proton valley angular distributions

at £,-30 MeV.

PHOTONUCLEAR DATA SHEET 1 1
Ref. V.MUWW, 9JU

& T%T (1)0)1

(190)

Elem. Sym.

Ne 10

Method Ref. No.

Reaction E or A E <7d E J

rr Notes

(y,p)

(7f«)

iy.m)

(7*A)

(7#**)

(7#^)

«•

1 -j#(*)rl« (**to W)

|r <*)*“*« (Ml« XV)

d jiiUa

<« •

(T#a> (Tj^O ««14 art to

« (7.«)» tmilmly (y,p) mt (7,4)

mam all trtn tm to (7,f).

Tabic I Reaction Threshold.

Vie V

| BootCtsa Threshold, MoV

Haactlei

N j O Ne Reaction

; n 1 O I Hi

(T. «>

(T. PI

it. P)

(T. ll

(T. P*l

IT. m)

(T. P? I It. -pi

10 34 15 60 16 79 (T. 2a) i in. % _ 11 32

7 34 12 It 12 79 • T. pm) ! 19.86 34.56 27 61

10 26 20 72 2'J '99 (7. 2 on) . 28. -i4 30. \S 28 St

11 HI 7 15 67 (T. 23/11

j — — 30 53

j 12 i9 22 J* 2J 22 : (T. 43) ; — 14.43

i 20 05 25 H6 20 26 (7. 330/1) | 19.77 —

| 18 2U 23 to 16 78 (7. 2p2n3a) — 42.71

25

i * 22 32 20 76 1

1 Table IV

He* Nu 0«*j Ne j He*

| N«* 0“

IT. P ) 33 33 1291165 1.09 2 ^ 5.3

( 7. n) 44 31 1051115 1.09 1 .5 3.4

(T. Pn) 12 128 59| 66 0.18 5.

1

1.3

IT. 21 — 3 4l 6 0.3 0.3

(T. ml 5 151 38 0.1 0.3

Stem; H>rong — .53 711151 1.2 1.4 i-prong — 70 271 il - 1.6 0.5

5-pron^ — 14 23 | 15 0.2 0.3

6-prong ~ 5 10

! — 0.03

a

exp 95-7 347 -U8I 600 2 . 40 ±0. 15 12.5 12.8 I 60 210 2401300 2.3 12.1 13.1

<7exp

,/ ^theor 1.6 1.55 1 . 812.0 1.04 1.03 0.931

<7^. ah»M#v~l

Ne |

14 10. .us ;o. 18 10. 01 10.

l.OlO. 07

1.51 0

1.9! 3

I ±0. 005!0. 023 0. 0 * 2 ,

22 10.25

II lo.io 03 >0.03 02 jO.07 0.0O5|O.U2

0.03 lo,12 0.01 10.01 0.00310.003

0.00110.001

I

13 |0. 6 il

43 10.60 23 lO. 33

8 ; 1.3

* ^exp""***5**1TM*01** v«lu0 o( the integrated absorption cross tactions <7

0 , ••

<7., and O

The theoretical values ^thaor have been calculated by means of the expressions;^

°o "60CNZ/A)MaV-®b; <7n » Ql 36 A

-*' 1 mb; an » 2.2S A*^* .in HtV~‘ form NBS-418

(8-1-63) USC OMM-OC 18556-P63 PHOTONUCLEAR DATA SHEET 1 1 2

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF' B.N. Sung

J. Phya. Soc. Japan 17. 1811 ( 1962 )

EL EM. STM. A

Ne 10

METHOD Betatron; proton spectrum; cross section; nuclear emuls ions REP. NO. $2 Su 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,XP SPC 16-23 c 23 EMU-D 2-13 90

(23.5)

:50

oc

50

( 7. » I, lata Liorgy r<«!a«T» £r—- 22o MeV 448 zcr*a si&cr

i 589

327 V 5 H

it I ^

ir

'•

' :|to» V r » ,-ji Sl 'Vaa

(59

£

b

<r3?5

<g3

5

'.’eV! 8 9 .0 11 >8 13

Fig. 1. Energy distributions of photoprotons from Ne:o

. This histogram is for the total number

of detected protons. The solid line is a smoothed curve by Vaioshek'3 method. The broken

line is a calculated curve using the statistical theory with Weisskopf’s level density

ur=C exp [2V&.245E] MeV*‘.

Fig. 2. Com parison of experiments for Ne“(r. p)F1 ** Nei0 (e, «'p) and Fis(p, ro). Curve (a)—present work, the observed energy

spectrum is devided by number of photons,^as- suming all proton 1 transitions are to the ground

state of F11. Curve Co)—Ne“(«, Sp) by Dodge and Barber. Curve (c)—Ne“(7o, p) reduced from F1 »(p, ;> +n) using- the detailed balance by Tanner

Thomas.

form NBS-418

in EV. 7-1 *-841 USCOMM-OC 28 010- PSA PHOTONUCLEAR DATA SHEET 113

U.S. DEPARTMENT OF COMMERCE

NATIONAL aUREAUOF STANDARDS
E. Finckh, R. Kosiek, K.H. Lindenberger, K. Maier

U. Meyer -Berkhout, M. Schechter, J. Zimmerer

Z. Physik JJ4, 337 (1963)

METHOD

) Ne

REF. NO.

10

Betatron; proton spectrum, cross section; Csl spectrometer

63 Fi 4 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

Type pangs TYPE RANGE

G,XP SPC 15-29 c 31 SCI-D 2-15 90

Maxima: E = 3*5 "MeV

P = 3.95 MeV

= 4.65 MeV

= 5.8 MeV

=7.1 MeV

= 7.7 MeV

= 8.5 MeV

=9.3 MeV

= 11.25 MeV

= 12.4 MeV

FORM MBS-4U

(REV. 7-1 4-64) use Ota*-DC 2601 0- PS

4

Hi* ' Enersieveneilun* W HNjinproionen ju» Neon. Xom*KTten Meflwerte dar. lie i<i «*etn*ene Kurve wurd* na Er)auienm*en 11

Dai Hisioirrawni ueiu die n'lneni MutelianasveruQrcn Knervievmusl

PHOTONUCLEAR DATA SHEET 114

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
A. Veyssiere, H. Beil, R. Bergere, P. Carlos, A. Leprecre, and

A. De Miniac

Nucl. Phys. A227, 513 (1974)

Ne 10

METHOD REF. NO.

74 Ve 1 egf

REACTION result EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE type range

G,N * ABX 16- 26 D 16- 26 BF3-I 4PT

G,2N ** ABX 18- 26 D 18- 26 BF3-I APT

* 869 + ** 870+

Fig. 4. (a) Photonuclcar cross sections [a(y, n)+a(y, pn)] and rr(y, 2n) for natural Nc. (b) Partial photoneutron cross section a(y, 2n) of 22 Nc.

) h

ro/° .06 NZ

0.7 L

0.6 )—

I 0.6

0.4

0.3

0.2

0.1 1

i1 °

l” 127 -• • *1

t *

* S

.20 ,«0

f Ca

ThI V !

20 30 40 60 A

Fig. 12. Ratio of experimental integrated photoncutron cross section «70

" over the Thomas, Reichc and Xuhn sum rule [0.06 S'ZiA). Numerical values and upper integration limits £* are taken from

table 3. Also Ju," = ±~°/0 for all nuclei. (over)

form N3S-413

(REV. 7-14- «4) USCOMM-OC 2601 0-P64 PHOTONUCLEAR DATA SHEET 115

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
0 . 6 -

0.5 -

0.4.

0.2

0.1

3V7<3 "o

39 „*

28 - 16 28 0

Si.

- :32

s ^Co*

420 Me

40ftr

f 45

Sc

0 1/2

3 /2 5/

2

T

Fig. 24. The [ao "/(0.06 NZU)] ratio as a function of isospin T. Possible overall errors ot -1 „ are

to be applied to all nuclei shown.

Table 3 Experimental integrated photoneutron cross sections = f^ M o

Tii (£)d£' compared with the

classical sum rule [0.06 NZiA] of Thomas, Reich and Kuhn T II o T = 1 jr=3 T=2| t= i

Nucleus t6 0 :o Ne 23 Si 32 S *°Ca 19p “Na 27A1 3I P

39 K | «Sc * o > 31 V

33 42 94 93 100 108 137 153 182 210

j 383 393 602 (MeV mb) =4 ±3 ±1 ±1 -7 ±7 ±9 = 10 ±12 = 14

I =25 =28 =42

<Jo nl(0.06NZfA) 0.24 0.14 0.22 0.21 0.17 0.38 0.40 0.39 0.39 6.36

| 0.57 0.66 0.3 £m (MeV) 30 26.7 30 30 29.5 29 30 30 29 30 j 23.1 25.“ 2:

116
REF.

METHOD

J. G. Woodworth, J. W. Jury, K. H- Lokan, N. K. Sherman

Can. J. Phys. 53 , 795 (1975)

EL EM. SYM. A Z

Ne

REF. NO.

10

75 Wo 3 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

g.n ABX 17- 31 C 19- 32 TOF-D 90

NORMALIZED TO D(G,N)

Fig. 3. Photoneutron spectra from 20 Ne.

Fio. 5. The cross section for the reaction 20 Ne<Y, n0 + /», + tt 2 ) l,N. -ORM N3S-418 use OMM-N as-o c PHOTONUCLEAR DATA SHEET 1

7

U.S. OEPARTMENTOr COMMERCE

NATIONAL. BUREAU OF STANDARDS

A= 20 «

*]BBaaaaaIiaaaan

A=20

f'k A=20

! Ref. H.J. Hay, J.B. Warren

Can. J. Phys. 1153 (1959)

Elem. Sym,

Me 20 10

Method 500 keV Cockcroft-Walton cascade generator; photodisintegration;

Li^(p,Y) reaction.

Ref. No. 59 Ha 1 EH

Reaction E or AE

S"

dE J

rt Notes

20

Ne (Y,Qf)

Ne^(7, 2o?)

20

Ne~ (y,orp)

He °(7,p)

17.63

14.8

17.6

14.8

17.6

14.8

Cross Section

0.05 mb

0.67 mb

1.80 mb

0.086 mb ~ 1.0 mb

21 mb

5 mb

State

ground state 0

6.06 + 6.19

6.91 + 7.12

ground state

6.06 + 6.14

16

ground state and

low levels at

0.100, 0.197 MeV

1.35 + 1.57

form NBS-418

(8-1-93) USCOMM-OC 18338-P93

'J.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF 3TANOARDS

PHOTONUCLEAR DATA SHEET 1 21
C. Broude, H.E. Gove

PICNS, 75^ (I960) Ne 20 10

METHOD

Tandem van de Graaff; inverse; Nal spectrometer

REF. HO. 60 Br 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

P,G RLY 17-23 D 14.-11 NAI-D uKN

(16.9-22.9)

Peaks: 18.1 MeV

19.4 MeV

20.^5 MeV

21.2 MeV

22.2 MeV

All have

T ss 350 keV

YieLOS IN THE ) ANO REACTIONS

Fig. 1:

FORM N8S-4J8

(REV. 7-1 4. 041 U3COMM.OC 2601 0.PS4

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS PHOTONUCLEAR DATA SHEET 122
SEF. ELEM. SYM. A Z J. M. Proc.

METHOD

Reid and B. Lalovic

Phys. Soc. (London) 76, 65 (L960) Ne 20 L0

REF. NO. 60 Re 2 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G.XP RLY 100-240 C 240 CCH

185 events (y,p) (y>Pn )

Recorded only events where proton with 20s E S120 MeV was emitted.

FORM N8S-418

(R EV. 7-1 4» 84) U3COMM.OC 28010-P94 PHOTONUCLEAR DATA SHEET 123

U.S. DEPARTMENT OF COMMERC.

NATIONAL BUREAU OF STANDARD
M. A. Clark, H. E. Gove and A. E. Litherland

Proc. Ruth. Int. Conf. Manchester 807 (1961)

£L C.M. j f M. A

Ne 20 10

METHOD

Doppler- Shift Attenuation Method

REF. NO. 6l Cl 1 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.G LFT 1-3 D 1-3 NAI-D 1-3 0

Table I Lifetimes obtained for the first three excited states in Ne30 using the Doppler shift attenuatton technique, a is the characteristic slowing down time for the target backings listed and

\ M\ is the ratio of the measured gamma-ray transition probability to the Weiskonf

Level (MeV)

£L(MeV)

Slowing materials a (10-i» sec)

T«rp. (10-1* sec)

Assumed multipolarity \M\*

1-63 4-25

1-63 262

Mg, A1 Al, Cu

8-9, 3-9 3-9, 2-9

5-6 + 3-8

3 ° - ft 0

- 7« t

0

0 :%

El E2

38 26

4-97

3-34 Mg. A1

8 9. 5-9

iq + 35 - 10 Ml, £2 £}, M2

4'4xl0~‘, 1-6X10-1

, 1-6x10-*, 3-3x10-*

FORM NBS-418

(REV. 7-1 4.64) U3C OMM-OC 26010-P64

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS PHOTONUCLEAR DATA SHEET 124
Ref. * »« U, Ml <1*9)1 (m * 9/9/tS)

Elem. Sym.

Ne 20 10

Method ( n) •

Ref. No.

Reaction E or AE ad E J

ff Notes

M.S

9

A/13

eV

7.1

16.6

l&tmP/m UO*5*)

0.9

1.0

3 . 0±20#

2 . 0±20#

ig. 10. Spectrum of 41.5 MeV electrons scattered from a neon gas target at 180*.

I i ~ -

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

-O RM NBS-413

(8*1*6 3) USCOMM-OC 18550*P«3 PH0T0NUCLEAR DATA SHEET 1 25
R.G. Allas, S.S. Hanna, L. Meyer- Schutzmeister , R.E. Segel,

F.F. Singh, and Z. Vager

Phys. Rev. Letters _1^, 628 (1964) Ne 20 10

METHOD

07 OQ. A1 lp,YQ

)Si ; tandem

REF. NO. 64 Al 3 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE P,G N0X 17 - 22 d 4-9 NAI-D DST

Table I. Summary of experimental results on the (/>, y> giant resonance (references 9-11). The angular distributions that are quoted generally characterize the data to within 15'* throughout the giant-resonance region.

Nucleus Type of observation Energy interval and range Result

C

11 90* yield curve 50-keV steps 4.0-14 MeV

Broad (

r

33 1 MeV) overlapping

levels; no correlation between y0 and y,

.

Angular 50-keV steps W(0)y =1 + 0. ISPx-O. 6P2 distribution W{0)y^ = 1+0. lSP^ a 4.0-14 MeV

Ne” 90* yield curve 30-keV steps 4.3-9. 1 MeVBroad (T * 400 keV) levels usually well isolated, y9 and y, well correlated. Angular 100-keV steps M'(e)

Y() = l + 0.05P1 -0.7P2

distribution 4.0-10.5 MeV tV(8) y] = 1 + 0. OSi^ + 0.

2

P2 Si” 90* yield curve •15-keV steps 4.0-12.5 MeV

Narrow (T^a0 keV)

Ericson fluctuations, superimposed on inter- mediate structure; no

correlation between y0 and y,

.

Angular 15-keV steps W'(0)Yo = 1 + O.O7P 1 distribution

4.0-

4.32 MeV

6.0-

6.62 MeV

8.0-

8.54 MeV

10.0-10.28 MeV

11.54-11.58 MeV

W(t))yi = 1+ 0. LPj^-0. 45P2 -0. 1P3

^he coefficients of P{ are average values. They actually increase by about 0. 03/MeV over the giant resonance.

FORM NBS-418

(REV. 7- 14-941 J3COMM.DC 29 010-P94 PHOTONUCLEAR DATA SHEET 126

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
N. W. Tanner, G. C. Thomas and E. D. EarLe

Nucl . Phys. j2, 29-44 ( L964)

METHOD

F

L 9

(p,y) n 20

e

Ne

REF. NO. 64 Ta 1

20 L0

JOC

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE P,G ABX 17-24 D 4- 11 NAI-D 90

AC E =5.25 MeV doy

l 90 = 350±1 10 ub/4nsr

From detaiLed balance:

- 70.

'

20.5

3(y,Po)dEy = 28±9 MeV - mb

16.4

Comparison with several other (p,y) results

Fig. 4. The excitation function at 90° of F

l, (p, /( —

y

0)Ne10

. The data shown in table 2 were used, to sketch in the curves for •/„ and /, separately. The Ne"(y, n)Ne‘* data from ref. •) are shown, using an

energy scale so that excitation energies in Ne10 correspond.

FORM NBS-418

(R E V . 7-1 4-64) use CMM- C C 26010-P64 PHOTONUCLEAR DATA SHEET 127

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS
REF. A.W. Parker, R.R. Whitehead, and G.G. Shute

Aust. J. Phys. _12, 147 (1966)

ELEM. SYM.

Ne 20 10

METHOD

Cyclotron

REF. NO.

66 Pa 3 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

P,G NOX 17.8 D 5.2 SCI- D DST

W(0) ~ 1 + a1 P

1 + a3 P

2

Tablx 1 AKOULAB DISTRIBUTIONS CORRECTED FOB SOLID -ANGLE EFFECTS, AND ORO88-SECTION RATIOS e9

<*1 <H

Croaa-aection Ratio (MeV) Y B

5-20 YO +0-18±0-03 -0-75±0-05

l-53±0-04 n + 0-05±0-01 +0-22±0-02

5-40 yo +0-10±0-03 -0-63±0-03

0-62±0-03

Yl +o-n±o-04 +0-33±0-04

FORM N8S-418

(R EV. 7-1 4-64) USCOMM.OC 26010-P64 PHOTONUCLEAR DATA SHEET 1 28

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOARDS
REF. R. E. Segel, Z. Vager, L. Meyer- Schutzmeister, P. P. Singh

and R. G. Allas

Nucl. Phys. A93, 31 (1967)

ELEM. SYM. A

Ne 20 10

METHOD

Proton capture [Page 1 of 2]

REF. NO. 67 Se 1 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

Jh£. ABX 16-25 NA1-D -QSI..

E y (MeV)

'o

19 20 F (p,y)Ne

Vi i

FO RM NBS-418

(REV. 7-1 4-44) USCOMM-OC 2A010-P44 *| 29 Fig. 3. Sample angular distributions for 1# F(p, y0 ) 20Ne and l, F(p, yl ) l0 *Ne.
R. £. Segel, Z. Vager, L. Meyer- Schutzmeiste

and R. G. Allas

Nucl. Phys. A23, 31 (1967)

method

Proton capture

Singh

Ne 20

1 10

[Page 2 of 2]

REF. NO.

67 Se 1 EGF

DETECTOR

ANGLE

TYPE RANGE

Fig. 9i Coefficients obtained in fitting series of Legendre polynomials to the angular distributions

for “Ffp, y0 ) 20 Ne.

form NBS-413

IR EV. 7-1 4-84) U3COMM.OC 28010-P84

Fig. 10. Coefficients obtained in fitting series of Legendre polynomials to the angular distributions 130 for **F(p, y1 ) :o *Ne.
W. Hofmann, R. Kosiek, G. Kraft and R.

Z. Physik 22^, 303 ( 1969 )

METHOD

Mundhenke

Ne 20

REF. NO.

L0

69 Ho 1 egf

reaction RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE type pange

G ,XP ABY THR- 33 C 24-33 SCI-D 3-I4 90

THS

Tabelle 1. Dnleii .A // , titreliten Reuktionen. Die Werte fiir den integrierten H'irkungsincrscliiiiir warden nitier der I inialmte aussddiefllicher Grtmdzustandsiibergdnge

bcredtnet. Fiir :3 \a mid 39 K als Ausnahme s. Text

Target

Anreiehe- rungsgrad Schwelle MeV

Druck

Oder Dieke

Endenergie MeVZahl

gcniess. Protonen

Ausbeute

Mb/ MeV sr

32.5

1 a{E) dE Figur

MeVmb

IS 0 99 16,0 230 Torr 32,5 36074 58 ± 7 38 x 6 1, 2

:0 Ne v0,9 12,8 450 Torr 28,0 3175 7,4 + 1 — —

610 Torr 32,5 6293 14,9+2 61 x 11 5, 6

:: Ne 99,9 15,3 240 Torr 24,0 1960 2,3 ± 0,4 — 4, 5 2S,0 4790 3,6 ±0.6 — 4, 5 32,5 5210 6,7 + 0.9 45 x 8 4. 5

-J Nd 100 8.8 65 m 24,0 14182 6.3 + 1,0 — 7 60 |j 32,5 11 152 12,8 ±2,0 1 1 7 x 30 7

30 Ar 99 8.5 250 Torr 32,5 45173 57-6 270 x 40 8, 10 -°Ar '<9,6 12.5 230 Torr 32.5 29 559 14.2 ± 15 104 x 15 9, 1

i-) K 93,1 6,4 80 m 24,0 24230 17.4+ 2.8 — 12 90 m 32,5 24941 41,9 ±6,7 405 x 100 12

34 Kr 99 10,7 1 70 Torr 32.5 35 515 12,7 ±2.0 80 x 30 14 Kr naturl. 10 1 70 Torr 32.5 1 3 570 1 2,5 ± 2.0 75 x 30 13 Xe naturl. 9 1 50 Torr 32.5 7553 7.6 x 0.9 40 x 7 15

i

Fig. 5. Der (.>•, pl-Wirkungsquerschrmt fur :0 Ne

'ohm NBS-418

IP EV . 7.1 4- 04) JSCOMM.OC 29010.094 PHOTONUCLEAR DATA SHEET 131

U.S. DEPARTMENTOF COMMERCE

NATIONAL. BUREAU OF 5TANOAROS
REF' W.L. Bendel, L.W. Fagg, S.K. Numrich, E.C. Jones, Jr., H.F. Kaiser |elem. sym. Phys. Rev. C£, 1821 (1971)

Ne

i z

20 10

METHOD

71 Be 1 hmg

REACTION RESULT excitation

ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E.E/ ABX 11 D 39,56 MAG-D 180

11.23. 11.58 MEV

EXCITATION ENERGY (MeV)

FIG. 2. Spectrum obtained by 180* scattering of 39-MeV electrons from 2,Ne. The dashed line shows the spectrum obtained with an evacuated chamber, in terms of counts per 1000 uC only.

TABLE I. Values of differential cross sections,^ spin and parity, transition radius, and radiation width for levels excited in 20 Ne, with DWBA corrections.

Level energy (MeV) (io-

" M cm2 /sr) J' R

(fm) (eV)

11.235* 145 ± 5 219 ± 10 1 + 2.53 ±0.15 11 2

+2* 1

11.58 ±0.03 16 ± 4 13 ±4 l* <1.8 b 0.65 ±0.18 h 2* <2.7 b 0.40 ± 0.13 b 27 4 l* 1* 0 0.016 ±0.009

‘See Refs. 14 and 15.

b The value calculated for* 2 is negative, with a positive upper limit. Therefore, the value of T, Is calculated as suming that R is between zero and the maximum value consistent with the data.

15 b.t.

Ritter, J.T. Parson, D.L. Bernard: Phys.

Lawergren, A.T.G. Ferguson, G.C. Morrison

132

Letters

, Nucl.

2SB, 538 (1969).

Phys. A108, 325 ( 1968)

.

FORM N6S-418

(REV. 7-14-04) USCOMM-OC 260
Y. Horikawa, Y. Torizuka, A. Nakada, S. and M. Kinnira

Phys, Letters 36B , 9 (1971)

METHOO

Mitsunobu, Y. Kojima,

Ne

REF. NO.

20 10

71 Ho 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE E.E/ FHF 1,^ D 183,250 MAG-D DST

1.63, 4. 25 MEV

4 tl , C f M J

Plg.l. The experimental form factors for the 2 members of the ground- state rotational bands in 20Ne,

2 *Ms? and 2 "Si are shown as a function of the qe (f (3|,

Flg.2. The same as for fig. 1 except for the 4* members.

The unresolved data of the 4.12 MoV ( 4 *) and 4.23MeV(22) 3tates 18 presented in the case of 2-1 Mg.

(over

FCBM Mas-418 REV. 7-1 4-64) USC OMM-OC 28010-P64 PHOT0NUCLEAR DATA SHEET 133

U.S. OEPARTMENTOF commerce

NATIONAL BUREAU OF 5TA NOARCS
(2) R. de Swiniarski, D. Glashausser, D. L. Hendrie, J. Sherman, A. D. Bacher

,

and E. A. McClatchie, Phys. Rev. Letters 23 (1964) 317.

(3) D. G. Ravenhall , quoted in: R. Hofstater, Rev. Mod. Phys. _28 (1956) 214.

(5) H. Rebel, G. W. Schweimer, J. Specht, G. Schatz, R. Lohken, D. Habs,

G. Hanser and H. Klewe-Nebenius , Phys. Rev. Letters 26_ (1971) 1190.

Table 1 The values obtained from the Nilsson orbits which provide the best fit form factors. The signs of the moments were

determined by the characteristic of the orbits. The 02 anc* 04 values of the present study are compared with those

of the ip.p') { 2 1 and (dr. or') (5| reactions.

<r

2

> l/2

(r 4

> 1/4 Q„ Ho 02 44

(fm) (fm) (efm 2

) (efm 4

) prosont

<e,e')

(P.P') (a. a') present (e.O

(P-P’> (O. dr')

20 j<e 2.91 3.14 +58 ±3 +249 *27 + 0.40 + 0.47

+0.35

± 0.01 +0.19

+ 0.28

0.05

+0.11

* 0.01

2-*Mg 3.03 3.24 69 ±3 + 48 *16 +0.45 + 0.47 - 0.06

- 0.05

* 0.08

28 Si 3 . 1-4 3.35 -64 t 3 +205 *33 - 0.39 - 0.37

- 0.32

* 0.01

+ 0.10

0.25

0.08 o

o ©©

«— X

134
T.K. Alexander, B.Y. Underwood, N. Anyas-Weiss, N. A. Jelley,

J. Szucs, S. P. Dolan, M.R. Wormald, and K.W. Allen

Nucl. Phys. A197 . 1 (1972)

Ne 20 10

METHOD REF. NO.

72 A1 4 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE type range

A,G LFT 7-9 D 3-5 SCD-D DST

4 LEVELS

Tasle 2 Summary ofy-ray decay measurements B

,

(keV)

J, 9 - J,w Branching

(*/.)

ary (mcV) r7 (meV)

|M(E2)| J (W.u.)

7191 0* — 2* 100 4.35 ±0.75 *) 4.35 ±0.75 0.37 ±0.07

7420 2* -* 2* £ 90. 6 i 1.4 146 ±19 *) 29 ±4 1.65 ±0.27 ») 2* -0* g 9.4± 1.4 *) S 15.2 ±2.6*) g 3.0 ±0.6 g 0.05 —0.01 2* — 4* < 7.6 < 11 < 2.2 < 2.6 7826 2* 2* 17 =1 58 ± 8') 11.7 ±1.6 0.48 ±0.07 «) 2* —0* 83 ±1 285 ±34') 57 ±7 0.73 ±0.09

2* —4* < 3 < 10 < 2 < 1.3 9029 4* — 2* 100 3050 ±375 *) 340 ±42 5.8 ±0.7

4* —4* < 2 < 61 < 6.8 < 1 *)

) Measured relative to «/y(6*) = l.36±0.I4 eV, Tefs. ,, • ,^

). *) <3(E2/MI) =* -8.36±i;®, |A/(MI)| 2 => (I.0±0.3) x I0* 4 W.u.

') Measured relative to iuy(2*. T =» 1) = 22.2±2.4 eV, ref. “).

*) Assumed to be pure E2.

•) Considered an upper limit since off-resonance intensity was not measured.

^J. D. Pearson et al. , Nucl. Phys. 54 (1964) 434

T. Diamond et al. , Gan. J. Phys. 4£ (1971) 1589

^D. W. 0. Rogers et al. , Can. J. Phys. 49. (1971) 1397

form N3S-418

'REV. 7- t 4-64) USCOMM-OC 26C10-P64 PHOTONUCLEAR DATA SHEET 135

U.S. DEPARTMENTOF commerc

NATIONAL BUREAU OF STANDARD
S. Mitsunobu and Y. Torizuka

Phys. Rev. Letters _28_, 920 (1972) Ne 20 10

METHOD REF. NO.

72 Mi 4 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E.E/ FMF 6-8 D 120-250 MAG-D DST

6.72-7.84 MEV LEVELS

TABLE I. Matrix elements M, transition radii R u , and reduced transition

probabilities fl(t‘2). M A.rAl 1 *

(MeV) J

* (F2

) (F) U<£2)/u,' P'

2 V 6.72 0* 7.37 ±1.97 2.11 ±0.48

:,v 7.20 0* 6.90 ±1.44 1.69 ±0.52

'si 4.98 0* 6.63 ±2.43 1.81 ±0.61

:(>Ne

6.82 ±0.52* 1.86 ±0.09 * 7.43 2*

0.13 ±0.03

:(V 7.84 2*

0.33 ±0.13

‘Ref. 12.

P. Strehl and T.H. Schucan, Phys. Lett.

27B , 641 (1968).

FIG. 2. Experimental form factors for the 6.72- (0*), 7.20- (0*), 7.43- (2*), and 7.84-MeV (2*) states, plotted against q eff .

form N3S-418

(REV. 7-14-64) USCOMM-OC 26010-P64 PH0T0NUCLEAR DATA SHEET 136

U.S. DEP ARTMENT OF COMMERCE

NATIONAL BUREAU OP STANDARDS
R. P. Singhal , H. S. Caplan, J. R. Moreira, and X. E. Drake

Gan. J. Phys. 51, 2125 (1973) Ne 20 10

METHOD REF. NO.

73 SI 15

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE type range

E.E/ FMF 1- 8 D 77-115 MAG-D DST

Table 1. Experimental form factors for 20 Ne

Square of experimental form factor x 10* (errors in %)

Eo (MeV)

0

(deg)

1.625 MeV

2i

* 4.24 MeV

4,

+

5.63 MeV

3r

+

5.78 MeV

1-

6.72 MeV

o2 +

7.17 MeV

3j”+

7.20 MeV

03 +

Tf

rJ

OO

81.28 60 31.62

(15) 81.28 75 46.23

(15) 102.40 60 60.56 4.956 2.480

(15) (15) (25) 102.40 75 93.41

(10) 77.00 125 86.50

(10) 81.23 125 113.5

(10) 77.00 140 115.2

(10) 102.40 90 103.5 1.333 18.64 3.165 7.090 4.340

(10) (25) (15) (20) (20) (20) 102.40 110 110.0 3.940 24.74 2.730 11.20 5.244

(10) (20) (15) (20) (20) (20) 114.40 110 86.34

(10) 102.40 140 103.8 32.00

(10) (15) 110.50 140 60.33

6 LEVELS

FORM N 3S-4 1

(REV. 7-1 4-«4> USCOMM.OC Z60IC.PS4

rNASE SHIFT AXALTSIS

.1! Hrt 2

20

/

LJ7J*V 2

22

/

0 50 O- 7S I OO I • 2S niMsfEU

PHOTOHUCLEAR data 137

Fig. 6. The result of best fits to the 1.625 MeV, 2* ___

state in J0Ne and 1.275 MeV, 2

T state in 22Ne. Tassie SRC' model has been used in a phase shift code for the fits. 4 R c
REF.

METHOD

1. 1. Chkalov, N. G. Shevchenko, A. Yu. Buki,

A.S. Litvinenko, and V.N. Polishchuk

Yad. Fiz. 22, 893 (1975)

Sov. J. Nucl. Phys. 22 , 464 (1976)

A. A. Khomich,

ELEM. SYM.

Ne 20 10

75 Ch 4 hmg

REACTION RESULT excitation ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ SPC 0- 35 D 151,164 MAG-D DST

Experimental results are presented of a study of the fine structure of the giant resonance in the nuclei “Ne

and 40Ar by the method of inelastic scattering of electrons. A correlation is observed between the energy

positions of the maxima of the fine structure of the giant resonance in the nuclei “Ne and 40Ar, on the one

hand, and the positions of the discrete levels in the respective nuclei 19 F and 39Ar, on the other.

—. <>

B*W0*£a = W.JM.V £ a 7 1

is'

I S t ^

1 tt» , l a

1

f w .

a. S3 am

a. as

O.i?

a.oi s

1 v a>

J C

? J t §

J? ^

70

JJVJ33

Z3

10

3 = 65“ £a =rsvmv

ji-mittnjafrAmts'&tjs. iV

} = «f*tV«/.i MeV

—"v.W'W

JJ JO 20 '5 w, MeV

5

'

FIG. 1. Spectra of electrons scattered by 20 Ne.

. f 13 17 13 IS iv 13 1Z u. MeV

FIG. 3. Fine structure of the giant resonance in the nuclei 40Ar (a) and '°Ne(b)at9 = 100° and E0 = 152, and the discrete-level schemes of

the nuclei 39 Ar and l9 F.

form N3S-418

‘REV. 7-14- 64) use OMM-N BS-O C PHOTONUCLEAR DATA SHEET 138

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
D. M. Skopik, Y. M. Shin, and J. J. Murphy, II Can. J. Phys. 53 , 1398 (1975)

ELEM. SYM.

Me 20 10

REF. NO. 75 Sk 10 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE E , A ABX 15- 24 D UKN MAG-D DST

GND STATE SIGMA

The electrodisintegration cross sections. '‘CXe.aol'^C.e' and ’“Neie.a^^O.e’, have been measured and. by using virtual photon analysis, a comparison with photodisintegration experi- ments has been made. Satisfactory agreement with earlier l2C(a.y0 )“O experiments was found and the 20 Ne(y.a0

)' 6 O reaction reveals several pronounced resonances.

Fig. 2. Comparison of the 20 Ne(y,5to) cross sections

at 9 = 45° and 90°.

“o pm N 3S-4 18 REV. 7- i 4- <J4) JSC OMM-N 0S-O c PH0T0NUCLEAR DATA SHEET 139

U.S. CEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. L.K. Fifield, F. P. Calaprice, C. H. Zirranerman, M. J. Hurst,

A. Pakkanen, T. J. M. Symons, F. Watt and K. W. Allen

Nucl . Phys. A288 , 57 (1977)

EL EM. SYM.

Ne 20 10

METHOD REF. NO.

77 FI 6 egf

reaction RESULT EXCITATION ENERGY

SOURCE oetector

ANGLE

TYPE RANGE TYPE RANGE A ,G LFT 10 D 6 SCD-D 55

Abstract: The radiative widths for decays of the J0Ne T = 1,2* (10.27 MeV) state were measured by 1 0=1 0. 27 Me

V

resonance a-capture in the reaction l6 0(a, y)20 Ne. A special windowless gas-cell target yielded a low-background spectrum enabling six y-branches to be observed with a Ge(Li) detector. The six branches correspond to decays from the 10.27 MeV level to the following levels: 2’(7.83 MeV),

2*(7.42 MeV), 3~(5.62 MeV), 2"(4.97 MeV), 2*(1.63 MeV) and 0'*'(g.s.). The branching ratios and

radiative widths to these levels are: 7.83 MeV [(0.22±0.06)%, 0.008 + 0.002 eV], 7.42 MeV

[(6.9 +0.4) %, 0.31 ±0.04 eV], 5.62 MeV [(2.1 ±0.2)%, 0.097±0.0I4 eV], 4.97 MeV [(l.3±0.1)%,

0.060 ± 0.008 eV], 1.63 MeV [(88.9±0.5)%, 4.08±0.43 eV] and 0.0 MeV [(0.64 ±0.14)%,

0.029 ±0.008 eV], The radiative widths to the 1.63 MeV and 7.42 MeV levels are used to determine

the CVC predictions of the weak magnetism form factors and their effects on certain /J-decay observables are evaluated.

Table 2 Branching ratios and transition energies for the 6.93 MeV resonance

Transition £‘0) (keV) Branch (%)

R-~ 0 10266.1 ±5.0 0.65 ±0.1

4

R - 1.63 8636.3 ±3.2 88.9 ±0.5 R - 4.97 5305. 2±3.

8

1.3 ±0.1 R - 5.62 4649.6 ±2.2 2.1 ±0.2 R - 7.42 2847.9 ±1.2 6.9 ±0.4 R - 7.83 2442.9 ±2.6 0.22±0.06

4.97 - 1.63 3332.0 ± 1.9

Table 4

Transition strengths for the 6.93 MeV resonance

Transition Type aiy (eV) r, (eV) j A/

1

2

|.t/| 2 (W.u.)

R - 0.0 E2 0. !4±0.04 0.029 ±0.008 0.32 ±0.09 e

1 fm* 0.10 ±0.03 R - 1.63 Ml 19.7 ±2.1 4.08 ±0.44 0.55 ±0.06 ^ 0.31 ±0.03 R - 4.97 El 0.29 ±0.04 0.060 ±0.008 (3.8 ±0.5) x 10 _1

e

J • fm; (8.3 ± 1 .0) x 10~* R - 5.62 El 0.47 ±0.07 0.097 ±0.014 (9.2 ± 1.3) x 10- V • fm ; (2.0 ±0.3) xlO* 3 R - 7.42 Ml 1.5 ±0.2 0.31 ±0.04 1.16 ±0.15 0.65 ±0.08 R - 7.83 Ml 0.04 ±0.01 0.008 ±0.002 0.050 ±0.0 12 0.027 ±0.006

form N3S-418

IR EV . 7-1 4-441 USC OMM-N &S-0 C

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDAROS PHOTONUCLEAR DATA SHEET 140
ReF J.M. Savidson and M.M. Lowry

Phys . Rev. C 1_8_> 2776 (1978)

ELEM. SYM.

Ne 20 10

REF. NO. 78 Da 5 hg

REACTION result EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

A, GO LFT 11 D 8 SCD-D DST

(11 .278) (8.18)

The properties of the 1", T = 1 state of “Ne at 11278^4 keV excitation were studied try means of the

, ‘0(<i,y)“Ne reaction. The level parameters determined for this state are not in complete agreement with

those reported in a recent study. The implication of this discrepancy for the feasibility of a measurement of

parity nonconservation in “Ne is discussed.

TABLE I. Properties of the Lowest 1', T=* 1 state of “Ne.

Reference uyf* (eV) £, (keV)

Ref. 3 a.7 ±0.3* 11270 ± 30

Ref. 1 0.58 ± 0.05 11259 ± 3 Ref. 12 1.2 ±0.3

Present work 1.0 ±0.3 11278 ± 4

‘The value quoted in Ref. 3 has been multiplied by L| to express It la the center-of-mass system.

D.J. Steck, Phys . Rev. C 1_7» 1034 (1978)

3 J. D. Pearson and R.H. Spear, Nucl . Phys.

54, 434 (1964)

12

K. Fifleld, Nuclear Physics Laboratory,

Oxford University, private communication

N3S-418

R E V . 7-14- 641 USCOMM-NBS-OC PHOTONUCLEAR DATA SHEET 141

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OP" STAnCAROS
ipppppIIII\1
REF Z.M. Szalata, K. Itoh, G.A. Peterson, J. Flanz, S.P. Fivozinsky,

F.J. Kline, J.W. Lightbo^v, Jr., X.K. Maruyama & S. Penner

Phys. Rev. Cl 7 , 435 (February 1973)

ELEM. SYM.

Ne o

C\J

< N

O

method

Page 1 of 3

REF. NO. 78 Sz 7 hmg

11/18/80

R EACTION RESUL T EXCITATION ENERGY

SOURCE oetector

ANGLE

TYPE RANGE TYPE RANGE E,E/ FMF 12-23 D 59-120 MAG-D DST

Electrons at five energies between 60 and 120 MeV were used to study the giant electric-dipole and

-quadrupole resonances in “Ne. Prominent electric-dipole peaks were found at 17.7, 19.1, 20.2, and 23 MeV in good agreement with photoreaction results. In addition our analysis reveals weaker fragmented

electric-dipole strength in the region between 12.5 and 15 MeV. Prominent electric-quadrupole peaks were

found at 13.0, 13.7, and 16.2 MeV, and a broad peak was found from 14.2 to 15.9 MeV. Two different analyses reveal a broad quadrupole excitation between 16 and 25 MeV. The dipole and quadrupole

resonances deplete about 65% and 100% of the energy-weighted sum rule, respectively. TABLE I. Reduced transition probabilities B(CU) obtained by (A) photoreaction subtraction and (B) multipole expansion using the Coldhaber-Teller model and the Steinwedel-Jensen model (square brackets) for the B(Cl)t and the Tassie model for the B(C2)t. Model errors

are not included.

Dipole reduced transition probabilities A. Photsreaction subtraction (Ref. 12) B. Multipole expansion

E, S (C 1 ) B(Cl)t (MeV) (e

J fm2 ) (e

: fm:

)

10-16 0.33 ±0.02

(0.35 ±0.02] 16-25 1.65 ±0.13 2.1 ±0.1

(2.2 ±0.1] 16-17.2 0.16 0.17 ±0.02

17.7 0.29 0.20 ±0.02

19.1 0.34 0.33 ±0.03

20.2 0.33 0.43 ±0.04 20.9-25.0 0.53 0.99 ±0.10

Quadrupole reduced transition probabilities A. Photoreaction subtraction B. Multipole expansion Ex B(C2)) Ex 3(C 2)1 (MeV) (e

: fm4

) (MeV) («

2 fm4

)

1.63 188 ±9 ‘ 7.30 18.1 ±0.9 10-16 123 ±19 10-13 110 ±5

(105 ±5| 10.4-11.2 10±1

11.9 11±1

13.0 19 ±2

13.7 17 ±2

14.5,15.0,15.4

30 ±3

16.2 24 ±2

16-25 119 ±18 18-25 88 ±5

(72 ±5]

Q 0.35-0.9 FM-1

9 • T*.4

#

iU ifl

f /

-Hi? r*

f if; 1 2 r rW9

exciTATioN cm:kgv <u,vi

FIG. 2. The radiatively unfolded longitudinal (solid points) and transverse (open circle) differential form

factors in the giant resonance region of 20 Ne obtained by scattering 119.7 MeV electrons through 75.4°. The

transverse form factor VT

( 0)Wr

i {q,u) wa3 obtained by a matching-^ experiment.

FIG. 3. The longitudinal differential form factor of

:oNe obtained by scattering 119.7 MeV electrons through

an angle of 75.4* is shown by the points with error bars. The dipole contribution obtained as described in Sec. EA is shown by the solid curve, and the residual contribution is shown by the dashed curve.

‘Obtained by using Helm model (Ref. 24) in a comparison to the elastic scattering.

(OVER)

form N3S-418 REV, '-ia-64 1 use omm-n as-o c PH0T0NUCLEAR DATA SHEET 142

J.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS
Page 2 of 3

FIG. 4. The longitudinal form factor integrated from

16 to 26 MeV is shown by the open circles and the residual form factor obtained by the subtraction of the dipole form factor is shown by the black circles. The resi- dual form factors can be explained by quadrupole excitations. The curve labeled GT (SJ) is the dipole form

factor calculated using the Goldhaber-Teller (Siein- wedel-Jensen) model.

FIG. 6. The results of the multipole expansion method,

showing the longitudinal form factor squared integrated from 10 to 25 MeV. The dashed, dash-dotted, and

solid lines are dipole and quadrupole components, and

their sum, respectively.

FIG. 5. The longitudinal differential form factor of

:o Ne at various momentum transfers. The points with error bars show the experimental results. The thin curve shows the dipole form factor and the thick curve shows the quadrupole form factor obtained by the multipole expansion method. The occasional error bar3 on

the Cl and C2 curves indicate statistical errors only.

In addition there are model dependent and unexplored

systematic errors.

TABLE III. The percentages of the electric-quadrupole isoscalar energy -weighted sum

rule Sj (Isoscalar) as obtained by the multipole expansion method, in comparison with (a, a') results iRef. 7), and calculations using an excited core model (Ref. 35). Results are also

given assuming the excitations were of monopole rather than of quadrupole character. Model

errors are not included in the present results.

Quadrupole

Present results (a. a') Theory Et Sj (Isoscalar) Ex (Isoscalar) Ex Sj (Isoscalar) (MeV) (%) (MeV) (%) (MeV) (%)

1.63 8. 2^0.5 1.63 16.3 7.80 3.7 ±0.3 10-18 41 ±2 12.9-16.4 19.5 15-29 29.8 10.4-11.2 2.8 15.8 7.9

11.9 3.3 21.1

23.5

8.9

1.1 13.0 6.4 25.5 4.0

13.7 6.2 12.9 4

26.1

27.2

4.1 0.19

13.9 5 28.1 28.9

2.9 0.66 14.2-15.9 12 15.2 6 15.9-18.0 11 16.4 S4.5 18-25 50 ±3 18.1-28.2 35:|;J

Monopole (Isoscalar and isovector) Ex S0 Et So (MeV) (%) (MeV) <%>

15-30 40

15.0 6.5 25.2 3.3 26.6 27.7 29.9 2.4

P

i

I

P

I

I

I

143

(
METHOD

Z.M. Szalata, K. Itoh, G.A. Peterson, J. Flanz, S.P. Fivozinsky,

F.J. Kline, J.W. Lightbody, Jr., X.K. Maruyama & S. Penner

Phys. Rev. Cl

, 135 (February 1978)

Page 3 of 3

ELEM. SYM.

Ne

REF. NO.

20

78 Sz 7

10

hmg

REACTION RESULT excitation ENERGY

SOURCE OETECTOR

ANGLE

TYPE RAN GE TYPE R AN GE

TABLE n. The percentages of the electric-dipole isovector energy-weighted sum rule Sj (Isovector) as obtained by the multipole expansion method, in comparison

with the results of photoreactions. Model errors are not included.

Dipole Present results Photoreaction E. St (Isovector) St (Isovector (MeV) <%) <%)

10-15.6 6.0 ±4

11.2 0.39

12.3 1.0 13.4 X.l

1-1.1 1.2 14.7 1.4 15.3 0.91 15.5-25.0 59 ±3

15.6-17.2 3.6 3.5 17.7 4.8 6.9

19.1 8.3 8.6 20.2 11.7 8.3 20.9-25.0 30.6 16.1

able fragmentation between 11 and 17 MeV, al- though the presence of some monopole strength in this region cannot be excluded. Thus the quadrupole. strength in 20Ne spreads over a wide energy

region and is not concentrated in a well-defined GQR as in medium and heavy nuclei. This seems

to be a feature of other light nuclei. An excited core model calculation for 20Ne,

wherein the low-lying excited states of the valence nucleons are coupled to the giant multipole re- sonance of the ls O core, was performed by

Kniipfer et al.” We have compared the results of this calculation with our experimental results in Table m. One of the characteristic results of this calculation is the splitting of CO and C2

strength into a higher and a lower energy component (14 and 21 MeV), which is in qualitative

agreement with the present experimental results as well as the results of (a, or' ) experiments. The

splitting of the GQR in deformed nuclei such as

20 Ne has also been examined by the coupling of

- c N 3S-4 1

H Ev. 7-14-64. JSC OMM-N 3S-0 C

U.S. OEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 144
* CF J.D. MacArthur, H.C. Evans, J.R. Leslie, H.-B. Mak

Phys. Rev. C22_, 356 (1980)

ELEM. SYM. A

Ne 20 10

METHOD REF. NO. 80 Ma 5 hg

REACTION RESULT

EXCITATION ENERGY

SOURCE DETECTOR

angle

TYPE RANGE TYPE RANCE

6,

A

LFT 7 D 3 SCD-D DST

(7.158) (3.036)

In an alpha capture experiment on an “O gas target, the 3*. 7.156 MeV state in !0>Je has been observed to decay to the 1", 5.782 MeV and the 4*, 4 243 MeV states with gamma ray branches of 45 + 5% and 55 + 5%, respectively. The strengths of the 1374 and 2908 keV transitions were deduced to be B(E2) = 51+8 W.u. and R(£ I) = 79+9

M W.u., respectively. The strongly enhanced E2 rate for the 3" to 1" transition is convincing evidence for these two

states being the first members of this K’ = 0" band in "Ne. From resonance scattering experiments, the alpha widths for these two states were determined to be 28 £ 3 eV and 8.1 + 0.3 IceV, respectively; values in agreement with

cluster calculations of alpha widths in

:o Ne.

LFT LIMIT 7.156 MEV

NUCLEAR REACTIONS Measured cr(£,9) for ls O(ct , a)180 and cr(Es) for

l80(a, y)

20Ne; deduced r„ for £,= 5.732 and 7.156 MeV and radiative transition - rates from £, = 7.156 MeV.

TABLE I. Transitions from the 3" state at £r = 7.156 MeV excited in tie ts O(a ,7)

z0 N’e reaction at Ea = 3.036 MeV. Energies with errors are for gamma rays actually observed. The

strengths are deduced assuming pure transitions.

Final state Ex (keV) J' E7 (keV) F, (meV) Strength

0

0* 7156 <0.05 <5.0 W.u. E3

1634 n* 5523 <0.08 <0.9 tiV/.u. El

4243 4* 2908 .4 ± 0.4 0.97 ± 0.11 79 ± 9 jiW.u. El

4963 2- 2188 <0.05 <0.23 mW.u. Ml

5621 3* 1535 <0.05 <o.os riw.u. :.n 5782 1- 1374.3 ± 0.4 0.64 ± 0.10 • 51 ±8 W.u. £2

form N3S-418

(R EV. 7-1 4-6.1 use omm-n as-oc PHOTONUCLEAR DATA SHEET 145

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS
M. Yagi , R. Amano

Int. J. Applied Radiat. Isotopes 31_, 559 (1980)

EL EM. SYM.

Ne 20 10

METHOD REF. NO.

80 Ya 2 Jl2_ REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,F18 YLD THR-60 C 30-60 ACT

1

1

Q_

TTio production rates of "F by the 20Ne(y, pn) l8 F plus :oNe(y, 2n)‘*Ne "F. :3 Na(y, m)' 8 F, and

F(.’- '•) T reactions were determined as a function ot the maximum bremsstrahlung energies between

30 and 60 MeV In addition, a simple and fast method to prepare anhydrous H‘ 8 F was studied by using KHFj target.

Taule I. Photonucleur reactions for l8 F production

Target nuclide (abundance. J „) Reaction type Threshold energy (MeV) Product nuclide

!0Ne (00.51) ly. 2nl 28.50 — ,8 F

3 'Ne 10.27) (y. 3n) 35.27 ‘ 8 jsj e

1 :3 Ne (9.22) (y. 4m •15.63

1 s Ne — 1

F

:o Ne 190.51) (/. Pn > 23.26 18 F

31 Ne (0.27) (7. P-'" 29.93 l8 F

33 Net9 22) (y. pin) 40.38 1

F

“NailOO) (y. in) 20.89 ,8 F

l, F 1 1 00) (y. n) 10.43 1

F

Max Dremssrraniunq enerqy (MeV)

Fig. I Production rates of 1 "F on Ne. Na and F targets as

a function of the maximum bremsstrahlung energy

form N3S-418

(REV. 7-1 4-441 USC 3MM-N8S*OC

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOARCS PHOTONUCLEAR DATA SHEET 146
. II . ' . .
P.D. Allen, E.G. Muirhead, D.V. Webb

Nucl. Phys. A357 , 171 (1981)

REP. EL EM. SYM. A Z

Ne 20 10

methoo REF. NO.

81 A1 5 hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TVPC RANGE TYPE RANGE

G , 1 N ; ABX 16-29 C 16-29 BF3-I 4PI

Abstract: The photoneutron cross section of 30Ne has been measured over a photon energy range 16 to ENRICHED NEON—20 TARG

29 MeV in steps of 100 keV. The giant dipole resonance is resolved into three strong peaks below

21 MeV and at least two broader resonances at higher excitations. This structure is consistent with

earlier measurements of poorer resolution and shows a correlation with the recent calculations of Schmid and Do Dang. Comparisons with high-resolution neutron time-of-f!ight and electron

scattering data indicate the existence of regions of structure, roughly 2-3 MeV wide, which exhibit

localised characteristics related to the excitation mechanisms. The role of deformation and configuration splitting effects in the cross section is discussed and possible directions of further study

are noted which might clarify the situation more fully.

NUCLEAR REACTIONS 2 °Ne(y. n). bremsstrahlung. £ = 16 - 29 MeV; measured o<£); deduced a. a* and differential form factor. B‘''F 3 detector. Enriched target.

Table 1

Photonuclear integrated cross sections

Ref. Reaction Upper

energy limit (MeV)

Integrated

cross section (MeV mb)

Fractional

dipole sum *

Melbourne (y. n) 20.6 20 ±2 0.07

26.7 49 ±5 0.16 28.5 58±6 0.19

Vevssiere et at.

3

) (y. n) 20.6 15.8 0.05 26.7 42 ±3 0.14

Woodworth et al.

!

) (y. n) 31.0 56.9-76.8 0.19-0.26

Ferguson et al.

1 5

) (y. n) 27 52 0.17

Gorbunov et al. J,

1 (y. n) 170 115 0.38

Dodge and Barber 4

) (y. p) 27 65‘ J10 0.22

Hofmann et al. 10

) (y. p) 32.5 61 ±11 Ok»o

(Comar and lavor 39

) (y. p) 80 160 + 80 0.53

Gorbunov et al. 3S

) (y. p) 170 165 0.55

Tanner et al. ::

) (y. Po) 20.5 28 + 9 0 09

Segel et al. ') (y. Po) 25.7 25 0.08

Gorbunov et al. 38

) (y. tot) 170 600 2

* Dipole sum = 60 SZ A = 300 MeV mb.

form M3S-4 18 REV. 7. 1 4-S41 JSCOMM-OC 2»O10-R««

(OVER)

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU C “ S T A N; Q A R Z 1 PHOTONUCLEAR DATA SHEET 147
Table 3 Comparison of the integrated cross section under the 17.6 MeV peak for the 20Ne(y, n0 + n, +n 2 ) reactions

Ref. J<rd£ (MeV mb)-

present experiment 3. 3+0.

3

Woodworth et al.

!

) 3.3 ±0.5

Veyssiere et al.

3

) 2.6±0.3

Fig. 3. The measured ’ 0 Nel y, tn ) cross section. The vertical bars indicate statistical errors while the horizontal bars show the variation of resolution over the energy range.

148
A=22
I

I

i

150
J SC

C MM- O

C 18333-P33 PHOTONUCLEAR DATA SHEET 151
A.P. Komar, Ya. Krzhemenek, I.P. Yavor

Dokl. Akad. Nauk SSSR 155, 291 (i 960 ); Soviet Phys. Doklady 123^

( 1961 )

c.l. c.ys

. 3 r y\.

Ne 22 10

METHOD

Synchrotron; proton, n-p spectra; angular distribution; cross

sections; cloud chamber

REF. NO. 60 Ko 2 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G, P SPC THR-90 c 90 CCH-D 2-24 DST

G, NP SPC THR-90 C 90 CCH-D 2-20 DST

pp pn PI 89$ Ne , 10fo Ne , 1$ Ne sep isdvrps

90

J

a^dE = O.bb MeV-b

0

In Figure 3'

da

dQ

= 0.29 + 0.11 sin20

In Figure 4:

—^ =[0.22 + 0.07 sin

2

0] + [O.O85 cos 0]

mbn

Fig. 1. Energy distribution of the photoprotons from the reaction ly, p).

mbn

Fig. 3. Angular distribution of

the photoprotons from the reaction (7 ,p) with energies exceeding 0.3 Mev.

mbn Q * Mev

Fig. 2. Energy distribution of the photoprotons from the reaction (y. pa). mbn

steTad

Fig. 4. Angular distribution of the photoprotons from the reaction (y,pn) with energies exceeding 0.5 Mev.

TABLE 1

Relative Outputs for the Photodisintegracion of Neon

Reaction

Nei0 ^e12

j NeIU

j Ne 1*

thresh Jihreshjoutputl output

vlev. jMev. i

| ’h

*;• p 12.0 ,,3 30 22

7 . n 115.0 10.4 17 30

7 . 2 n (24.1) (17.0 — —

7 , a 4.7 0.7 i 7

7* P n 23.3 23.4 0 18

7. 2p 1 G .0 25. G i r» 7 . an 21 .2 17.7 1 8.3 Other stars - - 7.3 13

No. of cases

90 1923 1759

) 3 dE, Mev. mbn

0 430 440

form NBS-418

(REV. 7-14-64) USCOMM-OC 26010-P64

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS PHOTONUCLEAR DATA SHEET 1 52
J. Graff, G. Chouraqui, M. Port, J

T. MulLer

J. Physique 22, 1Z.1 (1968)

METHOD

M. Thirion, S. Jang and

Ne 22 10

REF. NO.

68 Gr 1 egf

REACTION RESULT excitation

ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE A,G LFT 12,13 D 2,3 NAI-D 8- 13 DST

12,13-11.89,12.28 MEV

TABLEAU I

Caract£ristiques DES NIVEAUX iTUDl£s LeS VALEURS DE E

x ET r ont ete relevees dans LES REFERENCES [I, .")] TRAN.rrioN V, Transition y,

£* 1 M |* X =1 COEFFICIENT 1 M |* (”Nc) r I’y. Unites UE MELANGE I’y, Unites MeV MeV r WcV eV OK WKISSICOPP M2/F.1 eV i>k Welsskopp

2.71 11. H9 i- i:» o.:i« t o,i4 0.3N x 10-J — 0,207 - 0.04 7 o,:i5 o.i t 0.2N 10* 1 :»,19 12,28 i- NO 2,4 i 1.0 2,1 x 10-J — 0,1127 - 0,007 2,:i l ,o 1,7 - 10-3

Ed, 1 2,72 MeV Ea,= 3.2IMEV

Fig 2. — ! listrilmtions anjrulaircs des rayoniieincnts et y,. I.es liarres d’erreur sout d’origine statistique et tieniK-nt eompte des diverscs corrections appliquees. I.es droites representent les ajustements ohtenus par

la methode dcs moindres carres.

pork NBS-4 18

(R ev. 7-1 .-«4I USCOMM-OC 26 01 0- P6 4 PHOTONUCLEAR DATA SHEET 153

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
W. Hofmann, R. Kosiek, G. Kraft and R. Mundhenke

Z. Physik 225 , 303 (1969) Ne 22 10

METHOO REF. NO. 69 Ho 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,XP ABY thr-33 C 24-33 sci-D 3-14 90

Tabslie I. Dalai :u den a'nieliiai Reaktionai. Die 1 1 are fur Jen intcgrierten Wirkungsi/ticrsc/mitt warden inner tier Anmihme aussc/ilieJ3liclwr Griind:iisnmdsiibergdnge

berechnet. Fiir ;3 .Vu mid }r) K ids Ansiuilnne s. Text

Target

Anreiche- rungsgrad

(v,p)- Sehwelle MeV

Druck

Oder Dicke

Endenergie MeV

Zahl

gemess. Protonen

Ausbeuie qb MeV sr

3 2.5 jo(E)dE Figur

MeVmb

ls o 99 16,0 230 Torr 32,5 36074 58- 7 38 z 6 1. 2 -°Ne 90,9 1 2,8 450 Torr 28,0 3 175 7.4 - 1 — —

610 Torr 32,5 6 293 14.9-2 61 z 1

1

5, 6

: -Ne 99,9 15,3 240 Torr 24,0 I960 2.3 z 0,4 — 4, 5 28,0 4 790 3.6 z 0.6 — 4, 5

32,5 5210 6,7 z 0,9 45 i 8 4, 5

;J Na 100 8,8 65 q 24,0 14182 6.3 z 1,0 — 7 60 u 32,5 1 1 152 1 2.8 z 2,0 1 1 7 ± 30 7

i0 Ar 99 8,5 250 Torr 32,5 45 173 57 z 6 270 z 40 8, 10

-°Ar 99,6 12,5 230 Torr 32,5 29 559 14.2 z 15 104 z 15 9, 11

J>0 K. 93,1 6,4 SO jj 24,0 24 230 1 7,4 z 2,8 — 12 90 n 32,5 24941 41,9z 6.7 405 ± 100 12

C4 Kr 99 10,7 1 70 Torr 32,5 35 515 12,' z 2.0 SO z 20 14

K.r nauirt. 10 1 70 Torr 32,5 13 570 12.5 z 2.0 75 z 20 13 Xe naturl. 9 150 Tort 32,5 7553 '.6 z 0,9 40 z 7 15

i

i :o(-

30

Q- | S 40 L

U fi] i;

i!

i.

iu\i\n i

il l^U i i

I L

LI d L

! %u LV\

!.Q f

< 03- Aa\J \%

[Wevj 26

2 4 6 3 10 12 *4 SpfMeVj

Fig. 4. Der ( /O-Wirkungsquerschnitt fur ;: Ns, berechnet aus Jen Bestrahlungert

bei a 24 MeV, b 28 MeV and c 32.5 MeV

2 4 6 3 '0 12 '4

EpiiVeVl

Fig. 3. Energieverteilung der Photoprotonen aus : -Ne. £0 =32,5 MeV

154

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS
i]

G

R. P. Singhal , H. S. Caplan, J. R. Moreira, and T. E. Drake

Can. J. Phys. 51, 2125 (1973)

. EM. a YM. A

Ne 22 10

METHOD REF. NO.

73 Si 15 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E.E/ FMF 1 D 77-115 MAG-D DST

(1.275)

*&

ft

LEVEL AT 1.275 MEV

»Pr

«ASE S*IFT AHAUSJS

0 0 53 O 51 » OO I - 25 NXHUH RMSfa

Fig. 6. The result of best fits to the 1.625 MeV, 2*

state in 30 Ne and 1.275 MeV, 2* state in J3 Ne. Tassie model has been used in a phase shift code for the fits.

Table 2. Experimental form factors for the 1.275 MeV state in 2 *Ne

Eo (MeV)9 (deg)

Square of experimental form factor x 10 3 (errors in %)

60.3 90 3.12 (15) 60.3 110 4.96 (15) 114.7 60 5.73 (15) 114.7 75 9.54 (10) 114.7 90 10.52 (10) 114.7 110 10.20 (10)

FORM N3S-A18

(REV. 7- I a- 641 ^SCOMM.OC 26010- =64 PHOTONUCLEAR DATA SHEET 155

U.S. OEP ARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANDARDS

REF. c.M. 3 r X.K. Maruyama, R.A. Lindgren, W.L. Bendel, E.C.

and L.W. Fagg

Phys. Rev. CIO , 2257 (1974)

METHOD

Jones, Jr. , Ne 22 10

74 Ma 8 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ ABX 0- 19 D 37- 60 MAG-D ISO

TABLE iH. Summary of results of this experiment showing excitation energy, spin and B (EL) , J-PI

parity, transition radius, reduced matrLx elements, electromagnetic width to the ground ~ ~~

state, and transition strength. The Weisskopf unit is defined in Ref. 12. Where two J* as- signments ire made, the data are compatible with either designation. FOR ERRATUM SEE 78 Md 6

Level energy R B ( \L)i r, Transition strength

(Me" J* (fm> le • fm'^ or jiy fmJi_i

l (eV) (Weisskopf units)

5.31 - C.03 1

* 9 *0.18

-* oi -0.31 0.074 = 0.013 0.127 = 0.022 0.040 ±0.007

6.82 = 0.03 1

* 0 94*0.24 0.166 = 0.026 0.611 =0.096 0.092 = 0.014

9.14 = 0.03 1

‘ 2.S513;!* 0.320 = 0.030 2.83 =0.26 0.176=0.016

10.94 = 0.06 1

* 2.861S.II 0.045Lg ; §if 0 . 66^;-:; a A 9 = »0 .009 u - u-°-o.oos

( r 3.15lg;{| 0.095 = 0.016 1.13 =0.14 0.042 = 0.007

10.08 = 0.03 )l- 1.891?$ o.o3i 331'" o.o6ii3 ; 3 }; 3.14l8:g 0.03815:^1 1-3413.-1I 0-0321J:®;!

1 2.55 = 0.06 )l“ 2.m-4:U 0. 21^:88 0.0421» :q°;| 7.63 = 0.03 2 " 3.69 = 0.30 lo.iil:? <2.341?, ;?}< x 10

-3 O 7 C * 0 . 1

5.54 = 0.03 3.071?$ 3.5li;l a.461:

’

5

' * >o

'3 a 9 —

0.!6 U — ‘-0.09 11 . 86 = 0. OS ‘10l8:3 6 . 9:y5 «1.43li;-i'* 10"J 0 AO70.22 U.3

n.ia

TABLE 1. Values of differential cross sections for

states observed in this experiment in units of lo~32 cnr/sr. The incident electron energies are 37.39, 50.65, and 60.85 MeV. TABLE II. Reduced matrix element extracted from

fitting the data assuming an electric quadrupole transi- Excitation

tion. energy (MeV) i.do/dU h- l drr/dCD^ (da/dn ) so

Id Level energy B (£2)

1.27 = 0.15 so . 16 SO. 14 so. 020 (MeV. fm;

) 5.31 = 0.03 0.268 = 0.033 0.185 = 0.020 0.109 ±0.012

6.S2 ± 0.03 0.640 = 0.069 0.510 = 0.053 0.337 = 0.034

5 31 = 0.03 22 9 ± 5.t> 7.63 = 0.03 0.191 ±0.029 0.209= 0.024 0.171 =0.021

6.S2 =0.03 32.0 = 6.2 3.54 ± 0. 03 SO. 19 0.116 = 0.015 0.127 = 0.017

9.14 = 0.03 38.2 = 4.9 9.14 = 0.03 0.992 = 0.103 0.607 = 0.062 0.326 = 0.035

10.08 ±0.08 8.01} 10.08= 0.08 0.237 = 0.036 0.107= 0.016 0.068 = 0.011 10.64=0.06 3. 5 ± 0.9 10.84 = 0. 06 0.134=0.028 0.092 = 0.012 0.039 ± 0.008 12.56=0.06 3.01}? 11.36 = 0.05 0.097 = 0.030 0.107 = 0.016 0.072 = 0.010 12.56= 0.06 0.087 = 0.017 0.040 = 0.009

13.55 = 0.10 0.029 = 0.009

14.49 = 0.15 0.163 = 0.020

15.68 = 0.25 0.068 = 0.015

16.93 = 0.20. 17.43= 0.10 0.157 = 0.021

17.96 = 0.08'

18.73 = 0.20 0.112 = 0.018

fosm N3S-418

(REV. 7-1 4-94) lSCOmm-OC 28 0 1 C* P6 4

(over)

PHOTONUCLEAR DATA SHEET 156

U.S. DEPARTMENT OF COMMENCE

NATIONAL. 9UREAUOF STANDARDS
TABLE IV. Excitation energies (MeV) and spin and parity of states observed in the present experiment, compared with states observed in other experiments.

Present work. Currently-accepted e

level energy, and J

r (t.p) a (d,p) b ('Li,f) c (t.a) d level energy ana J'

1.27 ± 0.15 1.275 2"

5.31 ± 0.03 1* 5.331 5.350 5.335 ±0.009 (1, 2>

+

5.340 5.359 5.370 5.360 5.360 = 0.003 2* 6.823 6.821 6.820 6.800 6.819 = 0.007 2*

6.82 ± 0.03 1* 6.860 6.858 6.840 6.855 = 0.003 (1,2)* 7.633 7.630 7.640 7.632 ±0.003 (1.2)* 7.63 ± 0.03 2* 7.663 7.658 7.660 = 0.003 <0-3)'

8.54 ±0.03 2" 8.548 8.548 ±0.010 (0 -4)*

8.575 8.585 8.590 8.583 =0.005 (1,2)* 9.14 ± 0.03 1* 9.174 9.174 = 0.015 Currently-accepted

(a. vy >

f (a, a) 8 (t.

3 He) h level energy and J

11.745 11.75 =0.01

11.751 11.76 11.76 ±0.01 1" 11.36 ± 0.03 2" 11.89 11.89 11.89 ±0.01 1" 11.92 =0.01 (2*) 12.48 12.48 =0.01 12*) 12.56 ± 0.06 !i*,n 12.58 12.58 ±0.01 (l'l 12.61 12.61 ±0.01 (1~, 2*) 15.68 ± 0.25 15.400 ± 0.040, T-2

15.610 1 0.060, T = 2

1 2J NeU ,p i 22 Ne, Ref. 22. e Reference 21. b21 Neirf,p) 22 Ne, Rsf. 24. f I8 0(o!, 7iy) 21 Ne, Ref. 27.

cls O(7 Li,f)22 Ne, Ref. 25. 2 ,8 Ota, a) 18 0, Ref. 2S.

d :3 Na(t , at ) 22 Ne, Ref. 23. h 22 Ne(f , 3 He)22 F. Ref. 20.

--’R. H. Stokes and P. G. Young, Phys. Rev. 173, 1789

(1969).

2l P. M. Endt and C. Van der Leun, Nucl. Phys. A214, 1 T973), and references therein.

2J M. G. Silbert and N. Jaramie, Phys. Rev. 123 . 221

(1961).

’

23 S. Hinds, private communication to Ref. 21.

21 P. Neogy, R. Middleton, and W. Scholz, Phys. Rev. C 6, 835 (1972).

2i W. Scholz, P. Neogy, K. Bethge, and R. Middleton, Phys. Rev. C 6, 893 (1972).

2,

V.'. Kutsc'nera, D. Pelte, and G. Schrieder, Nucl. Phys. Alll, 529 (1963).

27 G. Chouraqui, Th. Muller, M. Port, and J. M. Thirion,

J. Phys. (Paris) 31, 249 (1970).

25 S. Corodetzky, M. Port, J. Graff, .J. M. Thirion, and

G. Chouraqui, J. Phys. (Paris) 29, 271 (1963).

1: See, for example. S. J. Skorka, J. Hertel, and T. W.

Retz-Schmidt, Nucl. Data A 2, 347 (1966).

157
R c F. A. Veyssiere, H. Beil, R. Bergere, P. Carlos, A. Leprecre, and

A. De Miniac

Nucl. Phys. A227 , 513 (1974)

EL EM. SYM.

Ne

A

22 10

METHOO REF. NO.

74 Ve 1 egf

REACTION RESULT excitation

ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,2N * ABX 18- 26 D 18- 26 BF3-I 4PI

Fig. 4. (a) Photonuclear cross sections [a(y, n )-oiy, pn >] and a(y, 2n) for natural Ne. (b) Partial photoneutron cross section a(y, 2n) of 22 Ne.

!p'o7°-“Ti V\I VI

o.eL

o.sk

I 0.4L

I

0.3 -

0.21

0 .’.

t

f I” ,37 I 31

f

f P

1^1

.18

t °

,ao

I N.

20 60 a

Fig. 22. Ratio of experimental integrated photoneutron cross section m," over the Thomas. Reichc and Kuhn sum rule [0.06 NZ'A\. Numerical values and upper integration limits £M are taken from

table 3. Also dff0

" — — ~°/

0 for all nuclei. (over)

FORM N3S-418

( R EV . 7-1 4.64) USCOMM.OC 26010-P64 PHOTONUCLEAR DATA SHEET 158

U.S. OEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
Fig. 24. The (cro 7(0.06 NZIA )] ratio as a function of isospin T. Possible overall errors of —7°; are

to be applied to all nuclei shown.

Table 3 Experimental integrated photoneutron cross sections = j^M crTii (£)d£ compared with the

classical sum rule [0.06 NZ':A\ of Thomas. Reich and Kuhn

K. II o r = v r= o- i r = 21 “1 li <*.

Nucleus 16 Q

2 °Nc 23 Si 22 S20 Ca i op 22 Na 27 A1 J1 P

2, Ki5 Sc ’ -4° i S1 V

<To

" 58 42 94 98 100 103 137 1 53 IS2 210 383 i 393 602 (McV • mb) | ±4 ±3 7 -7 ±7 : - 7 a: 9 10 ‘.13 •“14 ±25 ±23 ; ±42

<r0 "/(0.06/VZ//l)i 0.24 0.14 0.22 0.21 0.17 0.38 0.40 0.39 0.39 0.36 0.57 ; 0.66 0.3

£s, (MeV) ' 70 26.7 30 30 29.5 29 30 30 29 30 23.1 26.7 23

159
X . K. Maruyama, R.A. Lindgren, W.L. Bendel,

L.W. Fagg

Phys. Rev. C J_7, 856 (1 978)

METHOD

E.C. Jones, Jr., and EL EM. SYM. A z

Ne 22

REF. NO.

10

78 Ma 6 hg

R EACTION RESULT excitation

EN ERGY SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE E,E/ ABX 0- 19 D 37- 60 MAG-D 180

ERRATUM SEE 74Ma8

i

j

i Erratum: Excitation of Ml and M2 states in

22Ne by 180° electron scattering

[Phys. Rev. C 10, 2257 (1974)]

X. K. Maruyama, R_ A. Lindgren, W. L. Bendel, E. C. Jones, Jr., and L. W. Fagg

Cross sections, reduced matrix elements,

electromagnetic widths to the ground state, and

transition strengths for 22Ne deduced from the ex- perimental data should be multiplied by 2. The

published results were obtained with a miscalculation of the relative densities of ^Ne and H,. On p. 2262, first paragraph, right hand column,

last two lines, there is a typographical error;

2.79 ng and -1.91p.0 should be interchanged.

FORM N3S-418

R £ V . 7- 1 4-641 USC OMM-NBS-OC PHOTOMUCLEAR DATA SHEET 160

u.s. oepartmentof commerce

NATIONAL. BUREAU CF S7ANDAROS

I

ref H.P. Trautvetter, M. Wiescher, K.-U. Kettner, C. Rolfs & J.W. Hammer

Nucl . Phys. A297 , 489 (1978)

EL EM. SYM.

Me 22 10

REF. NO.

78 Tr 3

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE type rinse

A,G SPC 10-12 D 0-3 SCD-D DST

(10.2-11.47) (.66-2.20!

Abstract: The “CKi, y)22 Ne capture reaction has been studied at E, = 0. 6-2.3 MeV. The known

resonance at £, = 2.20 MeV has been established and fourteen new resonances have been found

in the energy range covered. The £, = 1.16, 1.32, 1.45, 1.53. 1.87, 1.96 and 2.15 MeV resonances correspond to resonances observed previously in the “CHa, n) 21 Ne reaction. The £, = 0.77,

1.25 and 1.27 MeV resonances represent new compound states in 22 Ne. Information on branching

ratios, or; values and total widths is reported. Transition strength arguments and analyses of y-ray angular distribution data together with results from previous work resulted in the most likely r assignments for the resonances. The £, = 1.66 and 1.78 MeV resonances are good candidates for the two !'=%* states predicted at £, = 11-12 MeV and are probably members of the A'* = 0" (ground state) and

A'* = 2* rotational bands in 22 Ne. The investigated energy range of £, together with that of previous work corresponds to stellar temperatures of T = (0.3 — 4.3) x 10* K.. The astrophysical reaction rate determined from these data is compared with predictions based in part on the nuclear optical model. The rate is also compared with that of the competing 18 0(z, n) 2l Ne reaction.

10.2, 10.92, 11.47 MEV

NUCLEAR REACTIONS “0(3, y), £ = 0.6-2.3 MeV; measured £„ £,. /

7 (0), /? (£). E

22 Ne deduced resonances, resonance strength, f, J, n, a, y-ray branching ratios, astrophysical

reaction rate. Enriched “0 targets. Gel Li) detector.

Table 2 Summary of the angular distribution results for “0(3. y) 22 Ne resonances

£, (MeV) Transition (MeV) *2 *) a** S

)

1.45 R — 1.27 0.9 ±0 3 -0.5 ±0.5

1.27 - 0 0.4 ±0.3

1.53 R — 0 -1.0 ±0.3 R- 1.27 —0 1 5 ±0.1

1.27 - 0 0.35x0.12

1.87 R - 1.27 0.3 r0.4 R - 8.90 -0.1 x0.2

3.90 - 1.27 0.1 ±0.3

1.27 - 0 -0.1 ±0.1

1.96 R - 3.36 1.2 x0.4 R - 6.34 0.1 ±0.4

6.34 - 3.36 0.8 ±0.2 -0.3 ±0.4

3.36 - 1.27 0.4 ±0.2

1.27 - 0 0.7 ±0.2

2.20 R — 0 — 1.06±0.1

0.03 + 0.12 R - 1.27 — 0.28±0.14 R- 5.15 — 0. 14 ±0. 10 -0.15±0.1

5.15 - 1.27 0.74±0.18 -0.3 ±0.3

4.46 - 1.27 0.20 ±0.10

1.27 - 0 0.24±0.02 -0.03 ±0.05

*) Corrected for finite solid angle of the Ge(Li) detector and finite size of the beam spot on the target.

“) ,1, terms arc included only in the analyses, if the a 2 term alone could not fit the data 5 1.4). The errors are obtained by variation of the u x terms within the statistical errors of the data.

FORM N3S*4ia REV. 7 • I 4.64) USCOMM.OC 26 010.P* 4

(OVER)

U.S. DEPARTMENT CCmMEPC;

NATIONAL 3UREALC- S T A >, Z \ t-i D S P HOTONUCLEAR DATA SHEET 1 61
Fig. 6. The -,-ray angular distributions for the R - 0 and R - 1.27 - 0 transitions obtained at the E, = 1.53 MeV resonance are shown together with their analyses.

22 e.

(MeV)

E,

IMeVl

Ne BRANCHINGS (%)

2.20

2. 15

1.96 187

1.78 166

IS3

145 132

1.27 125

1.16 077

0.76 0 66

1147 1143*

11.27

11.19

11.13

11.03* 1092

10.86

10.75* 10.70* 1069

10 61*

10 30

IQ 28

10.20

8.90 6 35 534

531 534

5.15 336

127

0

Ztit 19:2 SS -2

$5 28 5• 3 85«3

1 VO

j *00 u 5 S 6 = ’ 1 L_ t» 1 1 1 4*5 52:5

! f

}

1601 X:4 55•4 5:4

ft :S n•s

1

r

1

1 1

1 3

1 ^r

s r

3

T

n net

2

*- 4

* s5‘

8*!5'.6*.71 8*16*1

1*0*-4*

S'

tt not r-6*

5“= 4*

0*(1'.2*.3'l r(2*.3*l

1*4*

6*

1*

2

*

4*

2

* 0*

Fig. 7 Summary of results on branching ratios and 7* assignments to states in 22 Ne above the 2-particle threshold. The stars on the Ex values mark those resonance states, which have been established in the present work only through the 1.27 MeV secondary y-ray transition. The open circles indicate that the branching ratios for these states are taken from ref. ’). Information on E, and J

values for the bound

slates are obtained fromrefs. ’• 10, 22, 25

).

162
*ef. U. E. P. Berg, K. Wienhard

Nucl . Phys. A318 , 453 (1979)

EL EM. SYM.

Ne 22 10

METHOO REE. NO.

79Be7 hg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G , G ABI 5-11 C UKN-18 ... srn-n nsT

(5.328-10.203 1

Abstract: States at 5.328, 6.851, 8.553, 9.165 and 10.203 MeV in 22 Ne have been observed in a nuclear resonance fluorescence experiment using bremsstrahlung and high resolution Get Li) diodes. Photon

scattering cross sections, y-ray decay widths to the ground and first excited states, and lifetimes are

derived. The results are compared with inelastic electron scattering data and shell model cal- culations.

LFT

NUCLEAR REACTION 22 Ne(y, y), E < 18 MeV; measured Er

ofy, y). 22 Ne deduced mean lives, fn, fi(Ml) values. Enriched target.

Tabi e 1

Total photon scattering cross sections /_. y-ray decay widths /"

. mean lives, and Ml transition probabilities

in 22 Nc from resonance fluorescence

E, E.

t at

| VT3 Decay f. r0 n /T;\ Mean S( M I

1* - 0*)

( ke V

)

mode (MeV mb) (eV) (eV)

\ r j

< ke V

)

/ a (fs) (;<;>

5328 ±5 5326 — g.s. 0.10 r 004 0.25 ±0. 10 l 0.1 5 ±0.06 6851+3 6849 — g.s. 0.32 +0.1

1.65 ±0.65 0.79 o-3i ;2.g| 0.44±0.15

5576 6851 - 1275 0.085 ± 0 049 0.44 ±028 021

8553 + 3 8549 — g.s. 0.20 xO.08 1.28 ±0.51 1 o.5i :g ft 0.18 ±0.07 9165-3 9161 — g.s. 0.75 ±0.25 5.44 +1.31 I f\ 1 1 *0 06 U - 1 - -0 03 0.61 ±020

10203 — 4 10198 ^ g-s. 0.87 +0 29 9.28 ±3.25 0.84 0 059 *° 0JJ U ' UJ7 - 0 .0 l 0 8923 10203 - 1275 0.17 -007 1.83 ±0.78 0.16

FORM N3S-418 REV. 7-1 4- 641 USC0MM-N8S-0C photonuclear data sheet 163

J.S, CEPARTMENTOE COMMERCE

NATIONAL. BUREAU OF STANOAROS

X. K. Maruyama, F. J. Kline, J. W. Lightbody, Jr., S. Penner

W. J. Briscoe, M. Lunnon, H. Crannell

Phys. Rev. C19 , 1624 (1979)

ref.

method

ELEM. SYM. Me 22 10

79Ma3 hg

REACTION result EXCITATION energy

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ FMF 1-9 D 60-110 MAG-D 51-109 DST

(1.275-8.59)

The states of 2: Ne below 8.6 MeV excitation energy have been studied using the technique of inelastic ] 4 LEVELS, J-PI, B(CL)

electron scattering. Ratios of inelastic to elastic scattering cross sections were measured with incident ~~

electron energies between 60 and 110 MeV and scattering angles of 110* and 128*. Form factors for 14 . 77 inelastic transitions were measured for the momentum transfer range 0.4 to 1.0 fm' 1 . Reduced transition LOmpari SOfl 0 1 J r6SUl tS W1 th

probabilities for these states have been deduced and assignments of spin and parity have been made. assignments given in 7 Other

references is made in Table VIII.

NUCLEAR REACTIONS 2J Ne(e,e'), £=60 to 110 MeV; measured c(£) at 110° and 128° up to 8.6 MeV in excitation energy; deduced J, ir, B(CL). Enriched

Z2 Ne target.

TABLE IV. Squared longitudinal form factors, Fj} obtained from this experiment. Coulomb correction factors fc have been applied to all states. For the state at 6 £7 MeV, no Coulomb correction factor was applied. F^- for the

states at 6.70, 7.46, 3.17, and 3.59 MeV are tabulated assuming J* =

states, multiply by the ratio fc (2*)/fc

(3~) from the values of Table m.

3*; to compute Fr : assuming J*= 2* for these

£„ (MeV) 8 (deg) £j CMeV), J* 1.275, 2

F

3.36, 4°

i

: x 103 4.46, 2° 5.91, 3- 624, 2’

59.59 110.39 420 ± 021 0215 £0.027 0.075 = 0.021 0.083 £ 0.020

59.59 110.39 4.35 = 026 0204 £0.015 0.080 = 0.013 0.047 £0.014

59.59 110.39 4.57 = 020 0232 £0.019 0.070 = 0.023 0.051 £0.012

69.69 110.45 6.56 ± 028 0.304 r 0.020 0.163 = 0.013 • • * 69.91 110.39 7.68 = 0.32 0209 £0.025 0257 £ 0.019 0.073 £ 0.023

85.13 110.36 9.39 = 0.42 0.U04 £ 0.011 0.430 £0.024 0237 £ 0.021 0.098 £0.015

100.34 110.36 11.61 £ 0.49 0263 £ 0.012 0.462 ± 0.026 0.736 £ 0.035 0234 £ 0.021 110.61 11023 1026 r 0.46 0229 £ 0.075 0.496 £0.023 0.374 £ 0.045 0239 £ 0.023 63.34 12S .16 6.43 £ 0.33 • * * 0 257 £ 0.023 . . . . . . 77.42 123 .17 929 £ 0.39 0.045 £0.026 0.386 £ 0.029 0.362 £ 0.020 0.115 = 0.015 110.56 123.05 10.34 £0.57 .0.386 £ 0.045 0.461 £0.040 1.377 £ 0.075 0251 £0.031 £t (MeV), S’ 627, 0* 6.70, (3*, 2°) 6.90, 1- 7.06, 2* 7.46, (3', 2*)

59.59 11029 0.089 £ 0.022 0.090 ± 0.021 0256 £0.030 • .. • • . 59.59 11029 0.037 £ 0.016 0.082 £ 0.013 0230 £ 0.020 . . . • . . 59.59 110.39 0.0S3 £ 0.019 0.055 £ 0.014 0 203 £0.025 0.052 £ 0.016 .. . 69.91 11029 0.102 £ 0.026 0.121 £0.013 0275 £ 0.028 0.068 £ 0.019 0.052 t 0.010

35.13 110.36 0.097 z 0.016 0230 £ 0.013 0264 r 0.021 0.072 £ 0.011 0216 =0.012

110.34 11026 0.133 = 0.020 0219 £ 0.021 0252 £0.037 0.120 £ 0.016 0.206 = 0.017

110.61 11028 0.156 = 0.021 0244 £ 0.024 0.0S3 £'0.042 0.115 = 0.021 0.271 =0.021

77.42 123.17 0.133 r 0.015 0207 = 0.015 0265 £0.043 0.079 = 0.010 0221 i 0.011 110.56 123.05 0.170 t 0.023 0.451 £0.032 0.031 =0.073 0220 t 0.034 0203 = 0.023 £r (MeV), J

r 7.65, 2* 7.93, 2* 827, (3-, 2°) 3.59, (3-, 2*)

59.59 110.39 0232 £ 0.025 0.072 £ 0.013 0.021 £ 0.012 0231 = 0.012

69.31 110 29 0.4tif — 0.030 0227 = 0.013 * «• 0.235 = 0.021

35.13 11026 0.762 r 0.033 0295 = 0.014 0.074 £ 0.012 0.371 £ 0.034

100.34 11026 0.921 £ 0.049 0213 £0.019 0.075 =0.016 0.557 i 0.034

110.61 11025 1.007 £ 0.053 0201 £ 0.021 0213 =0.019 0.653 £0.037

77.42 123 27 0.T31 £ 0.045 0279 £ 0.013 0.063 =0.014 0.396 t 0.042 110.56 123 .05 1222 £ 0.073 0251 £ 0.025 0.126 = 0.023 0.917 £ 0.064

(continued)

c-o«m H8S-418

(REV. 7*14.641 USCOMM-NBS-OC PHOTONUCLEAR DATA SHEET 164

u s. oepartmentof commerce

NATIONAL BUREAU OF STANDARDS
TABLE VI. Excitation energies and reduced transition probabilities. The energies of states from die literature identified with the experimentally observed states are presented

along with the assumed J' and deduced B(CL)». The B{CL) t are averages of those in Table V. The uncertainties associated with 3(CL) t reflect the range of values including fitting errors allowed by the models considered. Where fewer than four of the models considered

allowed a satisfactory fit, the uncertainties are not presented. The reduced transition probabilities for those states are to be considered approximate values. Et flit.) E, (expt.) B(CL)

t

No. (keV) (MeV) J' (e1 fm^)

1 1274.57 ± 0.02 1.275 ± 0.010 2* 271 ± 36

2 3357.2 k 0.4 3.36 ±0.02 4* 17 000 ± 4000

3 4456.7 t 1.6 4.46 ±0.02 2* 13 ± 2 9 5909.9 t 1.8 5.91 ±0.02 3* 870 ± 250

10 6115 ± 6 6.14 ±0.04 2* 3.2 ± 1.5 11 6237 ± 5 6.27 ± 0.05 0* 3.3 ± 1.1 15 6691 ± 4 6.70 ± 0.02 2* 3.9 ± 1.5 3- 750 ± 400

18 6904 ± l.S 6.90 ±0.03 1* 0.08 ± 0.04

19 7052 k 7 7.06 ± 0.03 2* 2.1 ± 1.2 25 7470 z 20 7.46 ±0.03 2* 1.6 3- 350 ± 250

29 7644 fc 4 7.65 ±0.02 r 18 t 3 32 7924 r 6 7.93 ± 0.02 2* 5.7 ± 2.4 35 3152 z 4 8.17 ±0.02 2* 123 ± 1.3 3- 270 ± 270

41 3593 z 7 8.59 ± 0.02 2* 7

3* 1 700

FIG. 2. Born approximation form factors for states observed in this experiment. FL

2 for all states except at 6.27 MeV are the longitudinal squared form factors with Coulomb distortion corrections fc applied. Fr

‘ are the transverse squared form factors without Coulomb distortion corrections. The circles are measurements obtained in this experi- ment. Open and closed circles are used to aid in distinguishing among the various states. The solid line through the data are fits obtained using the generalized Helm model (model 4 of Table V). The crosses represent the 180“ electron scattering data of Ref. 8.

165
166

SOD I Ufl

Z=ll

Sir HumDhry Davy isolated sodium in the fall of 1807 and announced its

discovery before the Royal Society in London in November of that year. He

did electrolysis of sodium hydroxide to obtain the metal. The following

year, Joseph Gay-Lussac (1778-1850) and Louis Thenard used a chemical

process to reduce sodium hydroxide by iron at a high temperature. These

two methods for sodium production produced a conflict that raged for over

a century and was not resolved until the introduction of the Downs process

in 1921 which made sodium the cheapest non-ferrous metal available. The

incentive for all this activity was provided by Hans Christian Oersted's

(1777-1351) discovery that sodium could be used to prepare pure aluminum

by the reduction of aluminum chloride.

1 67

iMa

A=21

Na

A=21

Na

A=21
168
Ret- R.E. Benenson, L.J. Lido f sky

Phys. Rev. 12^, 939 (1961)

Elem. Sym.

Na 21 11

Method Van de Graaff; Nal

Reaction E or A E <7d E J *

Ref. No.

6l Be 2

Notes

JHH

(p,y) 1.17 3.6l±0.06

% («•*)

Fig. 8. .Angular distribution of gamma rays corresponding

to peak A of Fig. 7. ... 1 . i— 1 .

Fig. 11 . Energv-leve

scheme of Na:i from present work. Gamraa-ray transitions are labeled by letters corresponding to peaits in

Fig. ". Dashed lines indicate

transitions based purely on

energy difierencea with no

further supporting evidence.

'obm N8S-418

18-1-931 GSCOMM-OC 18S38-PS3 PHOTONUCLEAR DATA SHEET 169

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
R. C. Bearse, J. C. Legg, G. C. Morrison, and R. Phys. Rev. C _1, 608 (1970)

METHOO

E. Segel I ELEM. SYM.

Na

| REF. NO.

A Z

21 11

70 Be 3 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

P.G LFT 8- 10 D 6-8 SCD-D 0-9 90

(6.850-7.215)

8.973.9.216 MEV

The 7 decays of the two lowest T — 1 states in NaJl at 8.97 and 9.22 McV were studied as resonances in the Xca

{p, 7) reaction by use oi a gas cell and a 30-cc Ge(Li) detector. For the lower resonance, we find three branches: to the l* ground state (11%), to the first excited state (50%), and to the >}* second

excited state (39%). These results imply that J = $* for the T = i state. On the simple rotational model,

transitions from states of the A'—) (Nilsson orbit rr6) band are possible only to the ground-state A'*»j

( 7 ”) band. A /“i*, A' — i assignment for the lowest T<* \ state fits the observed branching ratios. The

second resonance decays predominantly to the ground state, and there is at most a 9% branch to the J*

state at 2.41 MeV. The second resonance is assigned A'-i. If the 2.41-MeV state is A-} ( 49) , no

transition to it is expected. On both resonances, transitions to higher excited states are obscured by background.

Table I. Radiative widths for the various observed transitions. In calculating the widths for the decay of the 8.973-MeV state, the proton branching ratio estimated from the work of Hardy and Bell* has been used; for the 9.2 16-MeV state,* the branching ratio given by McDonald et al. h has been used.

£,-(r=§)-£:/ (r=i) A*-/,*

(r,rT/n

(eV) r,

(eV) 1 -if.i/i i J

8.973—0 5 i.i 0. 73i0.3 0.06i0.03 8.973—0.338 5 4- . 5 4- 2 2 5.

1

3.3i0.6 0.31i0.06

8.973—1.72 5 4- . 7 4- 4.1 2.7i0.5 0.39i0.08 9.216—0 1 - ,3 4- 2

9 2 8.7 9. oil.

9

0.68i0. 13 9.216—2.41 ,1+-

2 2 <0.8 <0.9 <0.17

• Reference S. b Reference 7.

a

3 J. C. Hardy and R. E. Bell, Can. J. Phys. 1671 (1965).

b

7 A. B. McDonald, J. R. Patterson, and H. Winkler. Bull. Am.

Phys. Soc. L^, 652 (1968); and (to be published).

9. 21 -—

_

8.97

2.43Ne +p

2 81 - 2.41 -

1 . 72 -

0 . 34 - 0

- Na

^1/2* -5/ 2

*

-<9/2*1 ( 3/2

*

- 1 / 2

* 1 / 2

*

- 7/ 2 * 3/ 2

*

• 3/ 2* 3/2

*

3/ 2

* 3/ 2

*

Ftc. 3. 7-ray branching ratios for the two lowest T=] states

in Xa!l

. In computing the branching ratios, the angular distributions have lieen assumed to be those for pure .1/1 transitions. form NBS-418

IR E V . 7-1 4-64) U3COMM-DC 26010-P64 PHOTQNUCLEAR DATA SHEET 170

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANOAROS
ref. C. Rolfs and H. Winkler

Phys. Lett. 52B, 317 (1974)

EL EM. SYM.

Na

A

21

z

11

METHOD REF. NO.

74 Ro 4 egf

REACTION RESUL T EXCITATION ENERGY

SOURCE DETECT 0 R ANGLE

TYPE RANGE TYPE RANGE

P.G ABX 2- 3 D 1-2 SCD-D 90

The high-energy t observed in the :& Ne

a single-level Breit —\S

ail of the /'= i/2*, 2425 keV st

(p, y ) 2

Na reaction at £p

= 0.5

igner shape with = 0.3 1 t0.(

ate in 21 Na, bound by 7 keV against protor

-1.5 MeV. The observed excitation function

)7 eV at £x = 2425 keV.

decay, has been

is consistent with

s (E) = a(E)E

cm

exp(2irn)

n = Coulomb parameter

o

1—0

<

1 cc

2 C . Rolfs et_ al . to be published.

3 P.M. Endt and C. Van der Leun, Nucl.

Phys. A214 (1973) 1.

Fis. 2. Astrophysical 5-factor for the :0 Ne(p, 7 ) 21 Na reaction. The dashed lines through the DC— 332 and DC— 2425 keV data

points taken from ref. [2] are model predictions. The dashed-dotted line is the theoretical prediction of the high-energy tail of the

" 2425 keV bound state. A possible DC process to the ground state would have almost the same energy dependence as the DC —

332 keV transition and is indicated as a dotted line. Shown aiso for comparison axe the S-factor curves for tn^J n = (5/2)*, 1 169 keV resonance [ 3 ] ar.d for the new low-energy resonances at £p (Jn

) - 384 (1/21 and 41/ < 9/2 ) keV, observed in ref. [2)

-,71 1TMENT OF COMMERCE

I / I UREAUOF ST ANDARDS
-II
Na

A=22

Na

A=22

i 172

Na

A=22

Ref. R.W. Krone, J.J. Singh

Phys. Rev. UJ, 1562 (i 960 )

Elem. Sym. A Z

Na 22 11

Ref. No. 60 Kr 1 JH

MethodProton capture; Nal detector

Reaction

(PrY)

E or A E

E =0.6-1,

P 5M

ad E J

rt Notes

P =

P0.776 Me/

0.865-

1.010

1.120

1.215

1.296

1 . 35^

Na y mostly to ground state.

Na^^y mostly to 2.25 MeV level.

Fio. 1. Excitation curre tor Ne“'/,7)

tor £,— 730 kev to 1020 kev.

Fw. 2. :>'UV "Cizhc iutnbution observed il the '76*kav

rraooBnce. Plotted arc (he results obtained both lor Er — 776 tar

ind 76-t lerv. The resultant Kenuine spectrum is indicmlad by

'he hotw line. - { U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

FORM NBS-418

(3*1*03) USCOMM-OC 18338-PS3 PH0T0NUCLEAR DATA SHEET 175
N. W. Tanner

Nuclear Phys. _6l, 297 (1965) Na 22 11

METHOD

65 Ta 1 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE

P,G N0X 7 D 0-1 NAI-D 0-8 90

(7.5 ± 0.1) .3-1.0

(7.23 ± 0.1)

.... , „ _ LEVELS. SPIN-PARITY

Resonances in excitation function at E - 520 ± 5 keV and 76b keV 3 P

766 level as 2

520 level has small g.s. width

at E^ = 7240 ± 10 kev and 7474 ± 5 keV

form NBS-418

(REV. 7-1 4-44) USCOMM-OC 20 010- PC 4 PH0T0NUCLEAR DATA SHEET 176

U.S. OEPARTMENTOF COMMERCE

NATIONAL BUREAU OF ST ANOARD3
R. Hentela, J. Keinonen

Phys. Scrip. 1_7, 421 (1978)

«eF. ELEM. SYM. A Z

METHOD

Na 22 11

REF. NO.

78 He 3 hg

REACTION RESULT EXCITATION energy

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE P,G LFT 7-9 D 0-2 SCD-D DST

(7.47-8.50) (.768-1 .840

Angular distribution measurements of gamma-rays from unbound T = 1 states in "Na. R. Hemela and J. Keinonen (Department of Physics, Uni- J~PI

versity of Helsinki, Helsinki, Finland). Pkysica Scripta (Sweden) 17, 421-424, 1978.

Angular distributions have been measured at six ,l Ne(p, 7 )“Na analogue

resonances, with Ep - 0.70, 0.77, 1.09, 1.21, 1J6 and 1.84 MeV, and at

a candidate for analogue resonance with £'-=1.11 MeV. Gamma-ray

mixing ratios have been obtained for the first time for the decays of these

levels with determination of spin-parity assignments. The spins and

parities for the bound states at 1.98 and 4.36 MeV have been deduced.

Transition strengths provide information on the isoscalar and isovector

strengths in the self-conjugated nucleus "Na.

Table I. Results of the angular distribution measurements, spins and parities of the resonance states, the experimental angular dis- tribution coefficients corrected for finite solid angle, yf -values and channel spin ( r) and y-ray (8 ) mixing ratios. Except when otherwise indicated, the energy and final state spin values are as given in ref [4/

Cp c i c-t (keV) (kcV) (keV)

702 741 1 583 1* 1937 3060

3944

r o.oo i o.04

1’ +0.02 ± 0.03

2* + 0.03 t 0.04

1* + 0.06 i 0.03

+ 0.01 ± 0.04 3.3 -0.01 ± 0.03 5.5 -0.03 ± 0.04 3.2 + 0.02 ± 0.03 5.0

0.3 + 0.19 ± 0.10

0.3 + 0.29 ±0.11

0.3 -0.3 ± 0.3

0.3 + 1.3 ± 0.9 4360 l* + 0.06 ± 0.02 768 7474 0 2* 3* + 0.005 ± 0.009 1937 1* + 0.02 ± 0.02 1089 7780 1937* (1,2)- 1* -0.12 ± 0.04

2211 1- -0.14 ± 0.03

1113 7803 0 2*(D 3* + 0.01 ± 0.05

1952 2* + 0.03 t 0.03

1205 7891 891 4* 4* + 0.40 ± 0.02 1528 5* -0.09 ± 0.03 1983 3-a.e -0.14 t 0.05 1564 8234 0 2* 3* 0.00 ± 0.04

k 583 1* + 0.02 ± 0.05 1840“ 849 5'4 0 (1,2)* 3* + 0.04 ± 0.03

-0.02 ± 0.01 4.5 0.3 + 0.4 +-0.1 -0.02 ± 0.01 9.8 16 + 0.2 ± 0.2 -0.01 ± 0.02 3.0 16 -0.2 ±0.2 -0.05 ± 0.04 5.0 1.6 + 0.05 ± 0.10 (D

5.5 1.6 -0.1 ±0.3 (2‘) -0.02 ± 0.03 4.0 1.6 + 0.03 ± 0.03 (]*) 4.5 1.6 + 0.01 ± 0.06 (2*) -0.03 ± 0.05 3.0 6 >-0.35

(3.3) (0.4) (isotropic) -0.04 t 0.03 6.0 6 + 0.15 ± 0.09

(5.3) (0.4) (-0.2 ±0.2) -0.01 ± 0.02 1.3 300 -0.01 ± 0.02 -0.01 ± 0.03 2.6 300 + 0.03 ± 0.02 -0.07 ± 0.05 6.4 300 -0.08 ± 0.03

0.00 ± 0.04 2.1 oo isotropic + 0.03 ± 0.05 3.6 ao isotroDic + 0.04 ± 0.03 6.7 0 isotropic 6.7 oo isotropic c Present wo.k (see text). b Ref. [9],

c Ref. [12].

(over)

ffOPM N3S-418 REV. 7-1 4- «4) USCOMM-NBS-OC PHOTONUCLEAR DATA SHEET 177

U.S. DEPARTMENTOF COMMERCE

NATIONAL. auREAUOF STANDARDS
Table II. Electromagnetic transition strengths in ^Na. Except when otherw/ise indicated, the branching ratios are taken from ref. (4j. The y-ray widths f7

are from ref. [3J.

E< Ef JilTi) Branching 6 r

7

Multipolarity ryr^

(MeV) (MeV) ratio (%) (eV) (\V.u.)(n)

a

7.41 0.58 1*(1) 170) 8 ± 1 + 0.19 i 0.10 0.20 t 0.04 MI (2.9 ± 0.7) (- 2) 1.94 170) 15 ± 2 + 0.29 t 0.11 0.33 ± 0.07 Ml (0.9 ± 0.2) (- 1) 3.06 270) 28 ± 2 -0.3 t 0.3 0.70 t 0.14 Ml (3.7 ± 1.0) (-1)

3.94 170) 18 ± 2 + 1.3 i 0.9 0.45 ± 0.09 Ml >3.5 (1) 4.36 170) 31 ± 2 „ , +0.4

* 0J

-0.1

0.75 t 0.15 Ml

7.47 0 2*(l) 370) 78 t 3 + 0.2 t 0.2 5.3 i 1.1 Ml (6.0 ± 1.4) (-1)

1.94 1*(0) 10 t 2 -0.2 0.2 0.7 ±0.1 Ml (1.9 ±0.3) (-1)

7.78 1.94 (1.2)-(1) 170) 28 ± 3* + 0.05 t 0.10 0.17 ± 0.03 El (1.6 ±0.3) (- 3) -0.1 i 0.3 0.10 ± 0.02 El (0.9 ± 0.2) (- 3) 2.21 170) 60 ± 3 b + 0.03 t 0.03 0.40 t 0.08 Ml (1.1 ±0.2) (-1)

+ 0.01 - 0.06 0.24 * 0.05 Ml (0.7 ± 0.1) (- 1) 7.80 0 2717(0) 370) 15 i 2 > -0.35 0.18 ± 0.05 Ml (1.0 ± 0.2) (-2 f

1.95

(isotropic) (E2) ((2.1 ± 0.5) (0)) 271) 69 ± 3 + 0.15 i 0.09 0.81 ± 0.16 Ml (1.9 ± 0.4) (- 1) (-0.2 i 0.2) Ml ((1.9 ± 0.4) (- I)) 7.89 0.89 4*11) 470) 34 ± 3 — 0.01 i 0.02 0.5 \ d Ml 7(— 2) 1.53 570) 48 t 3 + 0.03 * 0.02 0.72d Ml 1.4(— 1) 1.98 3 70) 14 ± 2 -0.08 ± 0.03 0.21 Ml 5(—2)

8 23 0 2 *( 1 ) 3 70) 55 3 isotropic 1.2 ±0.2 Ml (1.0 ±0.2) (-1)

8.50

0.58 170) 12 ± 2 isotropic 0.26 ± 0.06 Ml (2.8 ±0.6)1- 2) 0 2*11) 370) 97 i 5 b isotropic 5.2 ± 1.4 Ml (4.1 ± 1 .1) (— 1) 170) isotropic E2 (4.0 ± 1.1) (+ 1)

l/i) means X to'

1

. b Ref (9|.

c Calculated for the pure transition. d Estimated from ref. { 3|.

178
Na

A=23

Na

A=23

i 79 A=23

D. Reagan

Phys. Rev. 100 .

METHOD

113-120 (1955) Na

REF. NO.

23 11

Linac

counted delayed neutrons from N

17

55 Re 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G ,N 17 AB1 THR - 400 C 90-400 ACT -

4PI

3

i :c. 4. experimental X 7 activation points for neon and sodium

a.c plotted in the unpcr graphs. The lower granhs are tr.e photon

cross sections, which were calculated as indicated in the text. Ine activation cross sections indicated by the solid lines are reconstructions from the photon cross sections shown. The photon

c.oss sections for energies ociow 80 Mev were chosen arbitrarily.

form N8S-418

(R sv. 7-t a-sai U 3COUM.ee 2S0 1 0* PS 4 PHOTONUCLEAR DATA SHEET 181

U.3. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS
Ref. E.G. Fuller, E. Hayward

Phys. Rev. 101 , 692 (1956)

Elem. Sym.

Na 25 11

Ref. No.

5 6 Fu 1

Method Betatron; photon scattering; Nal spectrometer

NVB

Reaction E or AE crd E J ^

Ra23

(y,y) Bremss.

4-40

Notes

Detector at 120°.

Cross sections given here are 13$ too

high due to erroneous cos 3 factor in

denominator of Eq. ( 5 ) [See footnote

8 in Phys. Rev. 106 , 993 (1957)].

Fig. 4. The elastic scattering cross sections for Na, Mg, AI, S, Ca, and Mn. The indicated scread in energy is the width of ti» differential discriminator channel, and the standard deviations are based only on the number of counts. The vertical lines at the represent the particle thresholds for the most important isotopes. The open circles at the extreme right indicate the magnitude oi th* Thomson cross section for Z free protons scattering coherently. The soiid curve superimposed on the Al data is the scattering section calculated from the dispersion relation by substituting for <r,(£) in Eq. (6) the sum of the neutron and proton yietf’* cross sections. a form NBS-418

(a-i-83) USCOMM-OC I8S59-PS3 PHOTONUCLEAR DATA SHEET 182

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDAROS
B.G. Chidley, L. Katz, S. Kowalski

Can. J. Phys. d-07 (1958)

c.u . o .vi

Na 23 11

METHOD

Betatron

REF. NO.

58 Ch 2 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,N RLY THR C THR BF3-I 4-PI

THRESHOLD

Measured photoxeutron thresholds

Reaction Measured Q value, Mev.

Other Q values, Mev. Method Reference

Xa«<7, «)Xa* 12.47=0.05

(12. 46 ±0.08)

13. OS rtiO.30 Threniiolcl Shar et at. ( 1 0.1 1

)

12.42 =0.05 Mass data Waps era (1955) 12.417=0.014 Review Mattauch et al. (1956)

See 58 Ka 1 for Cross sections

TABLE 11 Comparison of thresholds from mass data and from photoneutron reactions

Photoucutron

l\eaction threshold. Mev.

Xa“(v, «;Naa 12. 47-0 .i.5 Al»( 7. n )A1 : ‘ 12. lit A 'J .1)0 ,;p3o 1 2

Co‘»( 7 , «)Co“ 10 44 —u 05

Pru,(v , n)PrU0 9 40=0 05

' data Difference,

-*wicl. 11. .. Mev.

- '17=0.0,, 05=0.05

oh =0.06 —, ,7=0.03

12 :?!) =0.03 -o / -_-0.GG 10.49 =0.01 —o ;4=o 05 0.30 =0.00 -o ;g—

FORM NBS-418

(R £ V . 7-1 4-64) ’JSC OMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 183

u.s. oepartmentof commerce

ATIONAU BUREAU OF STANOAROS
form NB$*413

(a-i-*3> USCOUM'OC t8959-P«3

U.S. DEPARTMENT OF COMMERCE national bureau of standards

PHOTONUCLEAR DATA SHEET 184
PHOTONUCLEAR DATA SHEET 185
J. O'Connell, P. Dyal, J. Goldemberg

Phys. Rev. U6, 173 (1959) Na 23 11

METHOD

Betatron

REF. NO. 59 Oc 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,2N RLI THR-100 C THR-100 ACT -I ij-PI

REL T0 G,

N

Table II. Relative integrated cross sections.

Element (r.*>

Position

of the peak for

(y,») (t.2«)

Position

of the peak for (t.2«) Cu 1 23 Mev 0.003 42 Mev N“ 1 24 Mev 0.007* 0“ 1 22 Mev 0.002 40 Mev

p» 1 20 Mev 0.14 32 Mev

Naa 1 20 Mev 0.05 32 Mev

pu 1 20 Mev 0.06 (y,2 p) 45 Mev (rt,2p) 0.08 ( 7, 2 pn) 50 Mev (7, 2 pn)

• The (r.») integrated cross section was taken from reference .

1 t—

' o'6

I 1 r- (r.n)

1 4 «

O

1

(r.2n)

-

3

2

- - —L — 1 .1 —

1

MAXIMUM BETATRON ENERGY (MEv)

Fig. 1. The energy dependence

of several photonuclear reactions. The relative yield scales of dif- ferent graphs are independent.

form NBS-418

(R EV . 7-1 a-oa> USCOMM.DC 2S010-PS4 PHOTONUCLEAR DATA SHEET 186

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS
Ref- V.K. Rasmussen, F.R. Metzger, C.P. Swann

Nuclear Phys. 15, 95 (1959)

Elem. Sym.

Na 25

Ref. No. 59 Ra 1

11

Method Na 3 (p,p!) photon scattering; Nal spectrometer

NVB

Reaction E or A E <7d E J

it Notes

Na23

(y,y) 2.78 I4-I4-O keV

Detectors at 115°, 151°.

Intensity ratio:

I(^--

1.10±0.0J+

1(115°)

Lifetime of first excited state: +oA

T = ( 1 ‘ 8

_o.3^

Xl°

-12

sec.

I ig. 4. Sodium scatterer-magnesium scatterer differences from the data shown in fig. 3 . The

shape of the solid curves is that observed with the 440-keV 7-ray from Tl-oa adjusted slightly in pulse height to match the experimental points lit is not to be inferred that a precise comparison

ui the energies of these two v-rays has been obtained). The negative differences at lower puise heights result from smail errors in the placement of the scatterers, as explained in the text.

r..e sum of counts trom puise height 38 to 43 is taken to be proportional to the resonance effect. FORM NBS-418

( 8 - 1 - 93 ) uscoMM-oc lasss-Fss PHOTONUCLEAR DATA SHEET 187

U.S. DEPARTMENT OF COMMERCE

NATION*!. 3UREAU OF 5TANOARCS
Ref. W.L. Mouton, P.B. Smith

Nuclear Phys. 16, 206 (i960 )

Method Qqq kev cascade generator; 7 Vs from Ne (p,Y); Nal

Elem. Sym.

Na 23 11

Ref. No. 60 Mo 1 JHH

Reaction E or AE

$

<7d E J " Notes

(7,7) 9.ko 2.7±1.1 ev

2.0±0.5 ev

r^

Q

by absorption integral.

22 / r by yield measurement from Ne (p,7)

E = 637 kev; 7 energy varied to

Doppler - compensate by changing angle

with respect to proton beam.

PORM NB5-418

(B-t-ei) USCOMM-OC 18559-P63

U.5. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDAROS PHOTONUCLEAR DATA SHEET 1 88
i-cM. T.R. Walker, W.T. Morton

Proc. Phys. Soc. 4- (i 960 )

METHOD

Synchrotron; proton-neutron cross section; radioactivity

Na

REF. NO. 60 Wa 2

23 11

NVB

REACTION RESULT EXCITATION ENERGY

source DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G, 3N2P ABX THR-24-0 C 120-24-0 ACT -I 4-PI

( 120 , I80,2i40:

cr (0.33±0.03) 10 ^cm^/e quivalent quantrum

Data (in Table) below 120 MeV from other workers;

50 MeV data is that of Barber et al. , Phys. Rev.

2&, 73 (1955).

m

m

Yields relative to l, F(y, n) uF at 240 .vtev.

Maximum bremsstrahlung Yield of “F from ltC(y, n) nC

energy (Mev) 19p :3 Na «A1 yield 240 1-83(17) 0-18(9) 0-062(13) 1-62 180 1-78(16) 0-18(16) 0-058(16) 1-50 120 1-6(14) 0-15(14) 0-045(14) 1-34 100 1-5 — — 1-27 70 1-4 0-11 — M5

50 1-22 0-07 — 1-0

form N8S-418

(REV. 7-14-641 USC 3 MM- O C 26 0 1 0- Pfl

PHOTONUCLEAR DATA SHEET 139

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAU OF STANDARDS
pief. B. Ambrozy, A. Faudrowicz, A. Jasinski, J. Kownacki, H. and J. Ludziejewski

Proc. Int. Conf. Manchester 28L (1961)

METHOD

Lancman ELEM. SYM.

Na

REF. NO.

23 11

Resonance Fluorescence 61 Am 1 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G jG LFT l D NAI-D 120

Mean life of first excited state is T 0 . 3 ^ 0.2J 10

- 12 sec.

form N8S-418

(R EV. 7-1 4- 04) USCOMM-OC 25010-P94

U.S. DEPARTMENT OF COMMERCE

NATIONAL 0UREAUOF STANDARDS PHOTONUCLEAR DATA SHEET 1 90
i. E.C. Booth, K.A. Wright

Nuclear Phys. ^2, 4-72 ( 1962 )

Elea. Sya.

Na 23 11

Ref." No. 62 Bo 6

tothod ^ ivjcV electron Van de Graaff; bremss. ; nuclear resonance

scattering, ring scatterer; Nal JHH

Reaction E or A E (TdE J

rr Note*

Na 5

(7, 7)

Bremss,

0-4

Q = 110

Cnannel

?if. 3. Resonance fluorescence from the 2.9ft MeV state of Na“ ana trie 2 43 MeV state of The ThC peak is at 2.615 MeV T is the maximum oremsstxamung energy.

Table 3 'lean lifetimes of excited states deduced from the resonance scattering of bremsstrahlung

Nucleus Energy .MeV Spins g r.ir ir-d)

r < 10“ ±35%

F

1 * 100 1 46 > 0.13 in 0.25? Na :j luo 2.0ft 2 0.1 0.79 > 0 04

2.39 — 1 ? 0.53 il) > l iv? 2.64 - ; ? •i 6 n > 0 3?

2.70 - ,0.1) <ii >0.008?

2.9ft ? 0.46 ,D 0 03? Al“ 100 2.73 1 ^0 3 0 91 >0.22

2.9ft — i } 0.216 1 2.2 x l0-»

Si M 4.7 1.2ft i' - 1" 2 I 0 S3 1.5 2.43 2 Ml) 0 33 0.2 P* 1 luo 1.28 4- -4- 2 l 0 S3 2 2

2.23 -i 3 t 0.79 4.5 3.13 -1 2 ID 0 33 0.2 3.29 -1 3

3 0.79 > i.sir„n*

3 41 - 1 3 l) > i^ir, r-‘

3.51 -4 2 0.38 0 wir.r;’ 5” 95 3.73 0

- — ? ?

3

( I>o.6?(r0,/'} 1 3

J * 4.2 2 127 0- - 2 5 l 0.63 > 1.0 Cl1* 73.5 1 22 )

1 ,D 6?

1.76 — 5 3

! 1

(1. 4?

2.7 1 2.65) - 3 ?

3 (I) 0 3w,r,;;v

3 01 - : ) ? ID ,1 a:e<r, n'

Ci** 75.5 3.1 3 (LI >0 74?i l\ r

1

3 17 ?

3 l) >1 .v, r,r<

cl 1 ’ 24.3 0 338 4-- 3 1 l» > 13?

1.72 - 3 ill >u.si:r,r.* K” 93 2 53 }--? t l) > 1.6? 2.32 — ? ? l ID > 15?

3.02 — ? ? I II) " .»7? 3.60 >

l 1 l ) >0.7?

3. 33(3.94) - 3 5 ? U) 0 i4? -r, n*

4 06-4.12 ? ID >0 :.-,r„r'

Ca‘° 96 3 90 0” — 2* 5 1

(» 63 > 0.46 Cu° 69 1.33 1 - _ ; 2 (1) 0 ft 44>r> li

The factor ? equals i,2/— l , ;2/, -r- 1) -1

.

U.S. DEPARTMENT Of COMMERCE

NATIONAL aUWCAVJ Or ST ANOAROl

' CM H 3S-41

• -*3) COMM-OC 1S996-P93 PH0T0NUCLEAR DATA SHEET 191
Ref. D.W. Braben, L.L. Green, J.C. Willmott

Nuclear Phys. j52, 584 ( 1 9^2

)

Elem. Sym.

Na

Ref. No. 62 Br 2

23 11

Method "Liverpool University H.T. set"; Nal

JHH

Reaction i±E ad E J

"• Notes

Ne

22

(p,T) 440-1030

keV

9.43±0.0£

?.59±0.05

9.67±0.03

9.70±0.o4

9.78±0.o4

Tabl* iJ Angular distribution*

r — 0

r — l

i) 70-0 03

— 0. l4 — o i)3

0.01 —0 .02 — o u3 — 0 03

-tl 40 I)0!»

•• 30 '• <l‘* “ 13-0 (.-» — o o-.’-o 05

') 09-

0 OS -

• 34 -0 03

1 30 - o 05

* o, ti-pi-s [ mil [l

- 1. 1 tml II

1 \ pc 11

type 1 iv pc ll ripe (l

i.pc 11 t\pv 11'

l\ jv l r\:v It

'MH- 1

L (- ) 3/2+

5/2+

3/2+

3/2+

E = 636 keV; 82$ to ground state.

Po

= 854 keV; 28$ to ground state. = 902 keV; 37$ to ground state. = 952 keV; 50$ to ground state.

= 101^ keV; 10$ to ground state.

a) (9) = a

QP

o (cose) + a

pP

2 (cos0) + a^P^cose);

parameters in Table 6.

FO RM H8S-413

( 0 - 1 - 83 ) U3COMM-OC 19SS8-R63

U.S. OEPIRTMEST OF COMMERCE

NATIONAL IU8CIU OF STANDARDS PHOTONUCLZAR DATA SHEET 192
Ref. W.L. Mouton, J.P.F. Sellschop, R.J. Keddy

Phys. Rev. 128, 27^5 (1962)

Elera. Sym. A z

Na 23 11

Method MeV electron accelerator; Nal

Ref. No62 Mo 1 JHH

Reaction E or AE E

0 r S

tTdE Jrr Notes

Na23

(Y,r) Bremss;

600 kev Mj-0 kev (3.66±0.5C

~k

X 10 eu

)

l

Fi for sod it sodit with

sorb

sodii with

sorb alum

with

sorb

Dhis T gives a mean lifetime of

t = (1.80±0.28) X 10" 12 sec.

Scattering angle 130°

l‘

dCOO

Counts

per

G. 3. Results

'

. scattering from

im. Curve A: 3oc0 - tm scatterer aluminum ab- . , tr. Curve B im scatterer i. -- sodium ab- 2°co - ^ y ^ ^

;r. Curve C: V inum scatterer . »; i

.3 sodium ab- ’7" **’;

er. •. '3 000 _

40 SO 60 70 90 JO CHANNEL NUMBEt

rO NBS-418

(8-1*63) U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF 3T ANDARO' PHOTOHUCLSAR DATA SHEET 193
Elem. Sym.

Na 23 11

Ret. No. 620dl 0GRet. M. Odera

J.Phys. Soc. Japan 1J, 1675 ( 19^2

)

Method Synchrotron; foils; emulsions

Reaction AE

(YtP) bremss.

;

ETmax

lSMeV

r J

rr Notes

1. lxlO^protons/

mol /roentgen

Energy (Fig.l) and angular

distribution (Fig. 2)

Angulax distributions fit A(l + cos 9

'

Fig. 1. Energy spectrum of photoprotons from Na.

Irradiation by 18MeV bremmsstrahlung. The

inset shows the result of Ophel and Wright.31

* Present address: Institute of Physical and Chemical Research. Bunkyo-ku. Tokyo.

from Na. Upper one is for ail protons measured

and lower one is for those below 4.6 MeV.

Solid curves are Afl-rccs2 ^). -opm NBS-418 JSCOMM-OC I89S9-PS3 PHOTONUCLEAR DATA SHEET 194

U.S. DEPARTMENT of commerce

NATIONAL BUREAU OF STANDARDS
Ref. I.IorlMka

fhgr*. blj *61 (1963)l «mcw tm fea y^UAii (u a* 9^/63)

Elem. Sym.

Na 23 11

MethodLiaaa (Stated Mark XI) -

Ref. No. 63Bol BG

Reaction E or iS E ud E J

tt Notes

(•»••) *U.5

lsotop«

jLi*

jLt5

. 0“

,FU

i.AI”

tei« n

3.0

^.6

6.1

8.0

0.02

0.07

0.20

0.68

tela

XI

Energy of

evei (MeV)

Seta and parity

Ground Excited

state state

Inelastic electron scattering cross section (cur sr) < ! 0

- ,#

Radiation width to ground state (eV)

1 his experi- ment •)Weiss- kopr

3.36 1- 0‘ 4.0 20 0.42 4.7 0.32

. 0“

, 0.9

5.7

1 1- 0.15 50 0.03

j 0.3 3.6

l 0.16 .0* i 9.3 1* 0.6 30 0.20

1 5 16

l 3 ,0* .24 140 l* 0.25 50 0.14 3 58

l 5 .o- ,37.5

15.3 l* 0.25 50 0.17 ' 12.5 30

l 7.5 ,1- ( 54

9.0 1- 0.18 50 0.06 1.7 13

l 1.1 *- . 19.2

10.5 1)- 0.73 50 0.30 1 9.6 23 •r ' 6.4

!4.Q if- 0.43 A0 0.27 ill:; 53 u- 1 10.4 0- . 23.4

9.3 1* ;i- 0.92 50 0.30 1 7.3 17

1 4.6 24.6

!0.6 i- 0.65 50 0.25

1 3.2 25 b- l 4.9

19.0 0* I* 0.45 A0 0.AI 14.1 145

7.7 i- :.o zs 0.54 4.7 9.0

53 9 0* I" 3.0 :o 0.9 7 1 14.5

=a 13 1' 2.0 :o i 0 16.6 43

3.0 | I" 0.2 50 0.02 ,0.05 0.45 ii* 1.0 035

4.6 0.5 40 007 0.43 1.3 6.1 i- 1 0 40 o :o 4.4 4.6

3.0 l J* 2.5 50 0.68 12.3 10.8

>i* l *-0 11.0 0

r 1- 4.4 20 1.76 21.0 29

5= 14 l- 1.5 50 0 33 15.3 53

, }"

i 10

4.3 4- i* 0.7 50 0.10 : 0.67 2.1 U- 1 J.50 ,»* , 14.0

3.0 1.9 50 0.50

1 9.3 10.3 1;- l ’.0

lalaatia tMturhtf

(m2

/sr)vi0

9^

a 100*

0.2±50fo

0.5±boio

1.0±4ofo

2 . 5

30$

^2: v?*v: * LiZ *•

1.50

1.23

I 00 c.

0 75 -

0.50 -

0 25

0 00 _

5 1 Mev

4 6M«V

. 5 0M«V

32 M«V

Fig. 1 1. Spectrum of 41.5 MeV electrons scattered from Naa at 130°

FORM NBS-418

(8-1-53) USCOMM-OC 18530-

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

PHOTONUCLEAR DATA SHEET 195
Ref. S. Costa, F. Ferrero, S. Ferooni, B. Minetti, C. Molino

R. Malvano

Phys. Letters 6, 226 ( 1963 )

Elem. Sytn.

Na 23 11

Method iqq j,jey Synchrotron; 4 jf neutron detector; calculated integrated

cross sections - fitted with polynomial of degree T]

Ref. No. 63 Co 3 EGF

Reaction E or A E ad E J

rr Notes

Na23

(Y,*n) rte) dE

gets (v • v - v • v 1 )

' p n n n

-1 '

(Rc2. Ep2. 3 trc^igl)

7T ^ e^ “ WJ X

A-2

See "Boron" for plots of this and

f,rdE/60 NZ/a.

form NBS-418

(8-1-53) USCOMM-OC 1 8556-R53 PHOTOHUCLEAR DATA SHEET 196

U.S. DEPARTMENT OF COMMERCE

NATION*!. BUREAU OF STANDARDS
K. Sato

J. Fhys. Soc. Japan _18, 1353 (1963) Na 23 11

METHOD

Betatron; neutron cross sections; BF^ counters; ion chamber REF. MO. 63 Sa 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,XN ABX 12 - 24 C 12-24 BF3 - i 4 PI

i

I

j

2!L

a,b in Table I refer to two Lorentz

shaped peaks in the split giant resonance.

-24 2 Quadrupole moment Q q = 0.3 x 10 cm , based on Danes' theory.

form NBS-418

IS EV. 7*1 4-A4I U3COMM-OC 26C10-PB4

2

-

3 r

\/h

i

\ 7 U

/\

i ;

i/

Jl

A /

J!

/if / /

: y. p.

)

/]

\

I

\

*

\ I \

2C 25 -:"M ENERGYFig. 2. The (7, n)-r(T,np) cross sections for No** and Stung the cross section to the superposition

of two Lorentz lines. Sold line: present data obtained from the yield curve for the summation of the 7 runs. Dotted line: data of Montalbetti et at81

. Broken line: the superposition of two Lorentz

lines which is calculated from the parameters given in Table. 1. The arrows in the figure show the threshold

energies. “ 8) R. Montaibetti, L. Katz and J. Goldemberg:

Phys. Rev. 91 (1953) 639. HMOrONUCLEAJl DATA SHEET

Table I. Resonance Parameters Na" Si" Ea

(Ta f

E„

Tft

16.5 Mev

6.8 mb

4.0 Mev

21 . 0 Mev

10 . 5 mb

13.75 Mev

11.0 mb

2.0 Mev

20.75 Mev

13 . 0 mb

MAX BETATRON ENERGY IMeV)

Fig. 4. The breaks in the Na" (7, ») Na" yield

197

U.S. CEPARTM-U-I u-r tSMMERCE

NATIONAL "L?EAUO' jTANDAADI
J. M. Loiseaux, M. Langevin and J. M. Maison

Proc. Paris Conf. 1048 (1964) Na 23 11

METHOD

Betatron

REF. NO. 64 Lo 3 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,G ABX 10-30 C 10-30 NAI-D 140

The effective differential scattering cross section remains quite constant from

20-30 MeV.

form NBS-418

(R EV. 7-1 4-64) USC OMM-OC 2601 0-P64 PHOTONUCLEAR DATA SHEET 198

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
« e. r . F.R. Metzger

Phys. Rev. 1^ 6 , B3?4-79( 1964) Na 23 11

METHOD ic lO*

Van de Graaff; N (p,u)C source.

REF. NO.

64 Me 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G ,G LFT 4 D 4 NAI-D DST

(4.431) (4.431)

J-PI. WIDTH

J = f for 4.431 MeV level.

F° = (2.14 ± 0.l0)eV (partial width for ground state transitions)

“ 1

F = (2.25 ± Q.20)eV, or t = (2.9 i 0.3) x 10 sec.

form N3S-418

(REV. 7-1 *-««) JSCOMM-DC 2fi 0 1 0« P64 PHOTOHUCLEAR DATA SHEET 199

U.5. DEPARTMENT OF commerce

NATIONAL BUREAU OF STANOAPCS
EL EM. SYM. A

F. R. Metzger

Proc. Paris Conference 392 (1964) Na

METHOD

Resonance Scattering 15 N(p,ay) 12 C

REF. NO. 64 Me 2

23 11

JDM

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,G LFT 4 D 4 NAI-D 4 DST

The 4.431 MeV state in 33 NA has spin and (2. 1±0 . l) eV.

form NBS-418

fR EV. 7-t 4-64) USCOMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 200

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARD!
C. P. Swann

Phys. Rev. JJ6, B1355-59 (1964) Na 23 11

METHOD

lQ L 6^" Van de Graaff; F (p,u)o source

REF. NO. 64 Sw 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE

G.G N0X 7 D 7,7 NAI-D DST

(7.101:0.02) (6.91. 7.12)

Found level energy to be 7.10 ± 0.02 MeV.

Angular distribution

w( 0 ) = 1 + (0.47 ± 0.09)P,^4+ (0.32 ± 0.03)P,.

J

17 = i

I" = (0.62 ± 0.07)eV (partial width for ground state transition)

T = (0.93 ± 0.l2)eV (total width)

Quadrupo le-dipo le amplitude ratio (E2-Ml)6:

-1.3 <6< -2.2 or 2.5 <6< 3 .

J-PI. WIDTH

FORM H8S-418

(R EV. 7-! USCOMM-OC 2fl010-P«4 PH0T0NUCLEAR DATA SHEET 201

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF 3T AnCARDS
W. C. Barber and G. J. Vanpraet

Nuclear Phys. 72, 63 (1965) Na 23 11

METHOD REF. NO.

65 Ba 4 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E.E/ ABX 4 D 59 MAG-D 50-59 180

rj dyd e 63.3 ilb-MeV

gf

o = .32 ± .03 eV

Level at 4.431 MeV.

SCATTERED ELECTRON ENERGY (MeV)

Fig. 1. Energy distribution of 58.3 MeV electrons, scattered elastically and inelasticaily at 180* from a “Na target, after correction for radiative effects. The Ha.twi curve shows the area m

evaluating the cross section.

form NBS-418

(R EV. 7*l4-64) USCOMM-OC 2S010-PS4

U.S. DEPARTMENTOF COMMERCE

NATIONAL. BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 202
Scr. C. _ C..Y1 J.M. Wyckoff, B. Ziegler, H.W. Koch, and R. Uhlig

Phys. Rev. JJ7, B576-94 ( 1965) Na 23 11

METHOD

Synchrotron; ion chamber monitor

REF. NO.

65 Wy 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,MU-T ABX 10 - 35 c 90 SCI-D tPx

0 10 20 jo *o ENERGY, MeV

JL

Fig. 12. Sodium total photonuclear cross section integrated over energy.

FORM NSS-418

<R EV. 7-1 a- 941 USCOMM-OC 2S0I0-P94 PHOTONUCLEAR DATA SHEET Z03

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. E. Wernbom- Selin and S.E. Arne 11 Ark. Fysik _3i* 113 (1966)

METHOD

[Page 1 of 2]

REACTION

P,G

RESULT

SPC

excitation ENERGY

9 - 10

SOURCE

1 - 2

10 . E

p =921keV Ex = 9.67MeV E

p -929keV E x = 9.68MeV E

p = 982keV E x = 9.73MeV

9 67 759 5.79

923 669 *99

151 201

*01

151

51

201

51

71 51

101 31

760 70* 600 * 90 973 76S 1 702 *95

929 73*

101 51 <31

151 251

107. 201 51

351

. i an i n

I I

I

I

! ! I !

I IMII

. 2 99

. 2 71

’ 2 6*

• 2 39

' 2 09

elem. sym.

Na 23

REF. NO. 66 We 1

DETECTOR

NA1-D 1

- 10

11

JDM

ANGLE

DST

Na

11 12

Fig. 22. Decay schemes of the 921 keV, 929 keV and 982 keV resonances.

12 .

13. 3,*

E

p =»10S1keV 14 (Vo) Ep — 1069 keV E x = 9.81MeV E x -9.83MeV E

p = 1105keV Ex =»9.85MeV

981

i

503 983 | 744 ! 5*0

937 | 583 1 589 i

151

617

9 39 ! 591 : 505

20t c«*X *57. I 157. j SX I

10X i *51 I 101 207. 157.

985

| 7*6

I 9*3 I 721 I 5*2

I i ! I

I 2 0X *0X | 3X

!

1 29X I *X ill I

I i I I

! I

1

i »-j

! I

I

*78

. **3

. 3.92

I 385

3.68

. 2.98

r 2.71

1 2. 6*

• 239

2.08

Na

23

11 12 form NBS-418

IR EV . 7-1 4-64 ) USC OMM-OC 26010-P64 204 Fig. 23. Decay schemes of the 1069 keV. 1091 keV and 1105 keV resonances.
REF. E. Wembom-Selin and S.E. Amell

Ark. Fysik _3I, 113 (1966)

ELEM. SYM.

Na 23 11

METHOD

2 .

[Page 2 of 2]

REF. NO. 66 We 1

5. V E„=897keV 6. c _ a53keV c _ 961 1, ir=9.65MeV E

p =900keV E,=9i>5WeV

E D=661keV Er =942MeV Ep- 853 keVE,- 9.61 Mev !L=

—

4*2 679 *99 961 723 663 I 559

1 703 I 5.55

I 51

I 55X I 20

an I b 97 576

151 301 ! H | 21 1*1

501 I 31 I <31 III!

i I !!

DETECTOR

40 1

' 60 1 ,

: : i

: z t

1 III! 1 i

i

I i

: l

|

1

i

i

i

r

i

I i

1

s i

I

I :

z

4 78

4 43

3.92

3 35 3.68

2 93

2.71

2 64 2.39

2 .08

JDM

Na

11 12 Fig. 21. Decay schemes oi the 661 keV, 853 keV, 897 keV and 900 keV resonances. The spin value

of the 853 keV capturing state from Braben et ctl. [3]. •The figure refers to the resonance number given m ref. 1.

17. (V,) 10. \ 19. Ep= 12S1keV Ex=10D0WeV E

p = 1270 keV Ex = 10.01 MeV Ep=1334keV Ex = 10.07 MeV

JL Na

23

12

Fig. 24. Decay schemes of the 1261 keV, 1278 keV and 1334 keV resonances.

form N8S-4I8

| (R EV . 7- I A-S41

| USCOMM-OC 2«010-o««

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS PH0T0NUCLEAR DATA SHEET 205
W. Feldman, D. W. Heikkinen and W Phys. Letters 2£B, 593 ( 1967 )

method

E. Meyerhof

ELEM. SYM.

Na

REF. NO.

23 11

67 Fe 3 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

O.G ABX 23-29 D 12-31 NAI-D 20-30 00

LI7 + 016

Fie. 1. The high-energy portion of a y ray spectrum

! P>m 7 I i(16o,y)23Na for £(160) = 19.4 MeV. The

-n tided l-egion was summed for the excitation function,

i he cosmic-ray background in the peak region is in- dicated by a dashed line.

Fig. 2. The excitation function of the unresolved gamma

transitions to the ground- and Jirst-e.xcited siate:- ru 23 Xa for the reaction 7 Li( 160,'/) 23 Na.

form NBS-418

(R EV. 7.1 4.34) USCOMM-OC 29010-P64

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 206
REF. J. M. Loiseaux, J. M. Maison, and M. Langevin

J. de Physique 28, 11 (1967)

ELSM. SYM.

Na 23 11

METHOD REF. NO.

67 Lo 1 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,G/ ABX 15-30 c 24 NAI-D DST

TABLEAU I

Coefficient a des distributions a.ngulaires

W(Q) — 1 4-a cos2 0 “0 a( 19-25 MeV) =1 -0.1

»>Ta 3(15-18 MeV) = 0.1 - 0,1 3(18,5-23 MeV) = 0,4 ± 0.15 3(25-30 MeV) = 0,85 - 0,2 “Mg a(16.5-20 MeV) = 0.8 - 0.1 3(20-25 MeV) = 0,5 ± 0,1 3( 25,5-32 MeV) = 0,5 -L 0,1 “Si . . . 3i 15-17,5 MeV] = 0,87 — 0,1 3(18-23 MeV) = 0,7 ± 0.1 3( 25.5-32 MeV) = 0,5 4- 0,1 "K 3(14,5-18,5 MeV) = 0,5 - 0.

3(19-24,5 MeV) __ 1 0,1 3(25-32 MeV) = 1 ± 0,1

Sections etncaces diiterentieiies de diffusion ,'i 1 iii» pour u i

;

1 1). MNa (III) et My (V,. Section efficacc prevue par la relation de dispersion pour "Na (courbe II) et My (courbe I\').

form N8S-al8

(Rev. 7- 1 * ««i USCOMM-OC 28010-PS4 PHOTONUCLEAR DATA SHEET 207

U.5. DEPARTMENT CF COMMERCE

NATIONAL BUREAU OF STANCAROS
G. A. Savitskii, N. G. Afanas'ev, I. S. Gul'karov, V. D. Kovalev,

I. V. Andreeva, V. M. Khvastunov, N. G. Shevchenko

Ukr. Fiz. Zhur. 13, 1648 (1968)

Ukr. J. Fhys. 13, 1174 (1969)

EL EM. SYM.

Na 23 11

METHOD REF. NO.

68 Sa 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ FMF 2,7 D 225 MAG-D DST

TABLE 3. Squared Form Factor for Inelastic Scattering with

Excitation of ti\£ 2.08 MeV Level in Naa

2=2. 08,7=6. 27+7. 10

q*. fermi"*

| q', fermi" 1 fm.,.

n. il l -T.it ru.it j| 1 .26 14.5+1.2

«).;>! 20..: 1.1.7 ; i 11.1 ; 0.0

0.61 24.2±I4.7 J 1-41 7 . U» f-0 07

0.71 .12. 1-* o.l i.r. 7.2't-fc0.5fi 0.71 22. 0± 10.3 f 1.48 G.52 i-0.5|

0.>»0 15.8- 10.

H

j 1.51 5.71 J-o. l i 0.00 70..7-i. it. 1 i .5; 4. 1.1 i-O. .15 O.Oo 11 .0±8.9 1.7.1 1.57x0.15

0.09 4G..7±5.0 1 .865 I II 2 0.1 l

1 ,0H 51 .24-2.0

|

1 .08

1 2.08

3

o.oi j-o. 12 1.17 20 . 8 ± 1 .

7

1. 67 + 0.20

XAFI.E 4. Differential Cross Sections for Inelastic Scattering

of Electrons Having an Initial Energy of 225 MeV witli Excitatioti of tl« '•.27 and 7.10 MeV Levels In Na a

, Wliicli Were

X oi Resolved Ex(vritucntally

e °cxp • 1031

. cniVst

« °cxp- u”.

cm1 /^

30 G67±25l 74 47.7 ±5.2

35 •;:->±i25 76 16.2 ±4.2

35 351 ±131 78 40.6 +.7.6

40 I32±34 78 36.8 ±3.3

45 76. 2± 17.0 80 30.5 ±2.7

45 78. 0± 16.9 82 27.1 ±2.5

50 42. 8± 9-9 85 12.1 +1.5

55 »S.1± 4.4 95 8.20±1 .08 60 20. 7± 2.4 105 5.30±0.8S

65 9.01±1 .10 115 2.70±0 .64 70 6.96±0.08 125 1.35 ±0.46

Fig. 3. Form factor foe iaeli":: scattering of electrons wither

citation of the 2.08 MeV lift.’ in Na:)

.

form N3S-4I8

(REV. 7-14. 641 USCOMM-DC 260I0-P64 PHOTONUCLEAR DATA SHEET 208

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. K. Shoda, K. Abe, T. Ishizuka, N. Kawamura , M. Oyamada,

and Baik-Nung Sung

J. Phys. Soc. Japan 2^, 664 ( 1963 ) METHOD

EL EM. SYM.

Na 23

68 Sh 3

11

egf

REACTION RESULT

EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,XP SPC 20-24 D 20,24 EMU-D 2-14 DST

Table HL Anisotropic factor BIA of angular distributions estimated for the groups of strong transitions.

Assumed residual Energy (MeV)

Ey (MeV) BIA Used data11

1.27 18.3-20.5 0.5-0.

20.5 20.3-22.1 OOW D

»Na 22.1-24 cob) 24.0

7.0 20.7 -22.7 1.5=0.D

0 15.7-21 OOU) 24.0,19.0 up

7.0 17.4-20.2 0.5=0.

D

20.2 -22.7 1.3 = 1.

J)

f 14-20 oo 6* <J>- To)

0 4 14-14.3 2. 4=0.

17.0

“S

14.3-16.2 00»> 17.0 16.2-17.1 oo 6* 17.0

5.0 19.2-20.1 0.5=0.

D

20.1-21.3 0. 4=0.2 D

o 17.1-20.5 1 .5=0.2 20.5 -Ca 2.3 17.4-19.9 2. 6=0.3 JC-5

6.0 17.2-18.7 0.05=0.09 20_5 18.7-20.5 0.6=0.2 20.

a) The numerical number indicates the maximum energy of the bremsstrahltmg irradiated for the data. D shows the difference between the two disiri buttons. (j>, pj) shows the inverse reaction data. b) The negation oo radicates that the distribution is almost sin* 9, i.e.. the result has stronger maximum

than 1+10 sin1 d.

. \ i ’

£ v

H23

HCO

S, t

! 2C0-i

2?

wO8

«a I u. 1 - too-.

(-30 5j

1

1 C

1 >

,-60 =

10 g

1-20

i- % b Fubic II. Anisotropic factor 3:

of .i-r3sin: 0.

angular distributions determined bv least-squares 2 -

r = O'. sNa

( £y max — -0.5 MeV) (Ey =24 .0 MeV) (Curve B in Fig. 1) AVMeV) 3//** E,i MeV) 3,

£,(McV) b;a

2. 5-4.

1.6=0.

4. 7-6.

1.3=0.4. 7-6. 6 1. 5=0.

4. 6-6.

1.0=0.

6. 5-3.

3. 4-1.1 | 6.6 — S. 3 6.1-1.

6. 7-3.4 1.6=0. 7 i 3. 3-9.

9.6 = 6.8. 3-9. 6 ocu 0.5-0.

9.64 CO“l 9.64 as'*) 2.54 1 .4=0.4 3.54 1. 9=0.3

4 6 8 10 !2 U

£. (VeV)

Fig. 1. Energy distributions of pltotoprotons from

- : Na irradiated with 20.5 MeV and 24.0 MeV

bremsstrahlung. Curve D and its error brackets

(dotted curves) show the spectrum made by difierer.ee of the two results. Curves a, b and e, respectively showing the transitions leaving the

residual nucleus in 1.27. 3.3 and 7.0 MeV, are component spectra for curve D. Curve d is the

ditfurcnce spectrum between curve b and curve D. The notation oo ir.cicatcs that the distribution is almost sin*#, maximum than that of 1 - '.Osin1 0.

I: is used was# the result has stron;

FORM NBS-418

(R EV. 7.1 A- -41 U 3 COMM.OC 28010-RS 4

U.S. DEPARTMENT OF COMMERCE

... NATIONAL BUREAU OR STANDARDS PHOTCNUCLEAR DATA SHEET 209
j

W. Hofmann, R. Kosiek, G. Z. Physik 225, 303 (1969)

METHOD

Kraft and R. Mundhenke

Na 23 11

REF. NO.

69 Ho 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,XP ABY THR- 33 C 24-33 SCI-D 3-14 90

Tabelie 1 . Daten zu den einzelnen Reaktionen. Die Wertefur den integrierten Wirkungsquerschnitt wurden unter der Annahme ausschlieflicker Grundzustandsubergunge

berecknet. Fur Z3Na und 39K ais Ausnahme s. Text

Target

Anreiche-

-rungsgrad

O

0

(>'. P)- Schwelle MeV

Druck

Oder Dicke

Endenergie MeV

Zahl

geniess. Protonen

Ausbeute pb/MeV sr

32.5 fu(E)dE Figur

MeVmb

I8 0 99 16,0 230 Torr 32,5 36074 58 ±7 38 + 6 1, 2

:o Ne 90,9 12,8 450 Torr 28,0 3175 7,4+ 1 —

610 Torr 32,5 6293 14,9+2 61 x 11 5, 6

:: Ne 99,9 15,3 240 Torr 24,0 1960 2,3 + 0,4 _ 4, 5 28,0 4 790 3,6+ 0,6 — 4, 5 32,5 5210 6,7 +0,9 45 ±8 4, 5

:j Na 100 8,8 65 p 24,0 14182 6,3+ 1,0 — 7 60 p 32,5 11152 12,3+2,0 117+30 7

36Ar 99 8,5 250 Torr 32,5 45 173 57 +6 270- 40 8, 10

J0 Ar 99,6 12,5 230 Torr 32,5 29 559 14,2+1

5

104 ± 15 9, 11 39 £ 93,1 6,4 80 p 24,0 24 230 17.4+2,8 _ 12 90 p 32,5 24941 41,9+6,7 405 7; 100 12

JJ Kr 99 10,7 1 70 Torr 32,5 35515 12,7+2,0 GO O 1-1- o 14 Kr natiirl. 10 1 70 Torr 32,5 13 570 12,5+2,0 75 x 20 '3 Xe naturl. 9 150 Torr 32,5 7553 7,6 ±0,9 40-7 15

Fig. 7. Energieverteilung der Photoprotonen aus 23Na. a Fur £0 = 24 MeV,

b fur £0 = 32,5 MeV, c nach Ophel und Wright 28

form NBS-4J8

(REV. 7.1 4-S4I use OMM-OC 29010-P94

U.5. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS PH0T0NUCLEAR DATA SHEET 210
G. A. Savitskii, N. G. Afanas'ev, I. S. Gul'karov, V. D. Kovalev,

V. M. Khvastunov, N. G. Shevchenko, I. V. Andreeva

Izv. Akad. Nauk Fiz. ,22 , 60 (1969)

Bull. Acad. Sci. USSR-Ehys. 22, 56 (1969)

Na 23 11

METHOD REF. NO.

69 Sa 3 hmg

REACTION RESULT excitation

ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

E,E/ FMF 2 D 99-227 MAG-D 99-227 DST

(2.08)

Table 2 B( EL) 2.08 MEV

Squared form factors for inelastic scattering of electrons with

excitation of levels in Na and K

2,08 Me V **Na 3.8 Me V”K 6,5 >•* e V **K

f, t « rn !-• pl

to- f, f * rta i~‘ pf,

10—* f, fern i.-' Fl

0,4t 13,94-13,9 0,72 7, 43 ±7, 95 0,41 77,54-22.9

0,51 26,3-18,7 0,72 4,18-1-11,12 0,52 45,44-14,1

0,G1 24, 2-h14,7 0,32 10,9-4-5,5 0,62 43,14-15,1

0,71 32. 4± 9,4 0,91 18,54-3,3 0,72 23,94-5,7

0,71 22,0-10,3 0,91 14,6±4,4 0,72 23,3±7.8

0.80 45,8 — 10,8 0,92 12.04-3.3 0,S2 13,24-4,1

0,90 70,3-9,1 1,01 18,44-2,4 0,91 6.74-2.0

0,90 31,0±8,9 1.10 24,74-2,4 0,91 11 ,44-2.8

0,99 40,34-5,0 1,19 18,94-1,7 0,92 9.24-2.4

1 ,08 31 ,24-2,9 1,23 17, Oil ,7 1,01 7.5±t .9 1.17 20,8-1-1 ,7 1 ,37 11 ,S-4 1 ,2 1,19 0,3-41,8

1,20 14,54-1 ,2 1.44 3,004-0,87 1,28 4,45-4 1,09 1,35 11,1-0,9 1,53 5, 50 ±0,75 1 ,37 3, 79 88

1 .41 7,404-0,67 1.01 4,5G±0,52 1 ,44 2.77-40,57

1,45 7,20±0,50 1 ,73 1 ,35±0,35

1,48 •*) f j2 0 , j 1 1,51 5,71-0,43

1 ,34 4,43-0,35

1 ,73 1 ,374-0,15

1,80 1 ,114-0,14

1,98 0,914-0,12

2,08 1 1,07-40,20

Table 4

Characteristics of transitions excited by high-energy electrons in

23 Na and 39K

Method Ptriaetef 8 and aethod of deterain atioo

2,03 Me V »Na

(X=2)

3,6 MeV"K

(>.-3)

5,5 .M e V "K

<*-0

r

[

i 3 X

. 10-* 11 ,04:2,5 13,1 ±2,3 3, 40 ±0,69

1 i Ii{E\, Z,— /.)* 1 fe r.i U 107 ±23 1 1 800 ± 2500 1 4 , 3 ± 2 ,

1 5 13,7 ±3,0 19 ±4 G,4±1.3

(

Ay, , f e r a i * 2

1 ,55±0,10 1 ,39±0,04 1,79±0,15

1 Li ^

, l e rn l 1 0,43±0,07 0,34±0,09 0,79±0,17

2 J li (E\, Ii-lj), e

1 f«rni ,X G

| /? , fersi

1 t r an •

80±11

10,24-1,4

3 , 93 ± 0 , 57

03UO±400

10±1

4,38±0,06

8,5±1 ,5 3.8±0,7

3 ,39±0,22

U.S. DEPAfiTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS

form NBS-418

(R EV. 7-1 4. *41 USCOMM-OC 2*010- P*4 PHOTONUCLEAR DATA SHEET 211
REF.

I METHOO

N. Shikazono and Y. Kawarasaki

Phys. Letters J2B, 473 (1970)

Na

REF. NO.

23 11

70 Sh 2 egf

REACTION RESULT excitation

ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.G LFT 7 C 14 SCD-D

7 = 7.895 MEV

Table 1 Comparison between experimental log/f value* and radiative width*: Tth represent* the width estimated only from

the spin part with etj. (1); R denotes the ratio of the reduced matrix element of the spin part to that of the orbital part. Et (VeV) (T.J*) Ef

(keV) ( T,J*) log/* Ah (eV) Tobs (eV)

a> R

23n« 7895 (1*2* 2 / 0 <M

+

> 5.3 0.21 1.02 ± 0.37 5.5 a 1.2 23 Na 7895 439 <M

+

> 5.4 0.14 0.57 a 0.21 4.8 ± 1.1 31 p 6381 <?.r> 0 5.5 0.07 « 0.11 £ 1.2

a) in the estimate of T*ob8> branching ratio Tq/T for 23Na and 31p were assumed to be 0.64 and 0.18, respectively.

FORM NBS-418

tR EV. 7.1 4-8.1 USCOUU.OC 28 0 10- P8 4

U.S. OEPARTMENTQF commerce

NATIONAL. BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 212
REF- R. A. Alvarez, B. L. Berman, D. R. Lasher, T. W. Phillips, and

S. C. Fultz

Phys. Rev. C4, 1673 (1971)

ELEM. S YM.

Na 23 11

METHOD REF. NO.

71 A1 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE G ’ N

3h-T ABX 12-27 D 12-27 BF3-I 4 PI * G.2N ABX 23-27 D 23-27 BF3-I 4 PI

* INCLUDES G ,NP J‘j'7

TABLE IL Integrated total photoneutron cross sections and their moments.

E^yTiax int

3 <7.,b *-2 b Nucleus (MeV) (MeV mb) (mb) (mb MeV"1 )

23 Na 27 119 5.74 0.288

23 Mg 29 249 11.7 0.584

Fin. 2. Cross sections for !J Na. (a) Total photoncutr<-n cross section, <7i(Y,n ) - (y,np) < (y, 2n il. (b) Singlcphotor.cuf ron cross section, a[(y ,n) - (y,np)\

(c) Doublephotoncutron cross section, 17(7,2 n). The thresholds (arrows/ are taxon from Mattauch etai. (see Table I/.

(over)

FORM N8S-413

(REV. 7-14- Q4) JSCCMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 213

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANDARDS
Photon Energy ( MeV)

4. Comparison of the present total photoneutron cross sections with previous measurements. The dashed curves

u»iicate the results of Sato (Ref. 11) for - : Na and of Nathans and Yergin (Ref. 13) for - 5 Mg; the dash-dot curve repre-

**TKs ' J Na data of Fielder, Bolen, and Whitehead (Ref. 12).

214
M. Piiparinen, A. Anttila, and M. Viitasalo

Z. Physik 247, 400 (1971) Na 23 11

METHOD

71 Pi 2 egf

-

REACTION RESULT

excitation

ENERGY

SOURCE OETECTOR

angle

type range TYPE RANGE

P.G RLX 9-10 D 0-2 SCD-D dst

9.61 MEV LEVEL, J-PI

Table. Angular distribution coefficients and mixing ratios measured at the £,=*= 953 ke V

E, J* (MeV) £r

(MeV)

1} Legendre polynomial

coefficients

a; a.

<5

9.61 3/2* 0 3/2* 0.60 ± 0.04 - 0.04 ±0.04 0.15 ±0.07

2.2 ±0.4

0.44 5/2* — 0. 1 s ± 0.01 0.00 ±0.01 0.07 ± 0.06 — 7.0 ± 1.5

3.91 5/2* — 0.16 ± 0.02 -0.01 ±0.02 0.05 ± 0 05 -6.0 ± 1.5

3.91 5/2* 0 3/2* 0.00 ±0.02 0.00 ±0.02 -0.20 ±0.08

10.0 ±2.0

2r Ne(p.y) : 'Na

'2 73 •0016

'251 oooc

"74 9917 "47 989-

lies 9851 c9

. 5338 C6S 98’

•CC6 9*55

982 9-33 95C 97C3

529 9683

921 9675 9CC 9654

397 9652

853 95'0

725 9438

562 9423

54C 94C6

4.3C 9353

-2-15-5 — « !’- 49 - —5-’4 ; — 23-"9 9-’8-

-‘ 7 3'-32- —4S-'3 '2 -•6-9-8 —

-9-9 54-

-33’2-Q-23 !-*!

23-34-

-3—

-2" -3-

—9-12 - 3 2- 7-3- -2-3-

2-10 - 5

-

21 —7

- -42-25-2—'— 9-

- 25-3 —

5

- 34-'6 '- —45 '— 3 - —30-44-' —27-42— 2-

-'8 -’3-35-5

- '0-4-2 -‘0 —

48

3

- 2 -21 -

-—-'9-'5- -73-2- -48 —

-9-8- - -39 2-

5/2*

1 /2

*

• '3,2.S2J*

• '3/2.'*

'/2

*

3/2*

• 3/2*

• 7/2 3/2*

•(3/2.5/2>*

• " 2

* 5,2"

3/2*

• (3/2)*

•

' 2/ 2

'*

'12 72.3,2!*

3 ,2C75 ,2640 ;296J;3e46(4430(5361 ,5741 ,6044)6869; 440 239- 2703 3673 3913 4775 564S 5756 5617 7074

'CO

9

2 29

26

•338

52

39

’4

5 54

Fig. I. Decay modes of the excited states in :j Na proposed in the present work. The V* assignments are from Refs. ' <\ except those marked with an asterisk, which

are from the present work (see discussion). Errors in Ex values are ± 2 keV

(over)

U.S. DEPARTMENT OF COMMERCE

form N3S-418 NATIONAL 3UREAUOF ST ANOAfiOi

(R EV . 7-1 4-641 U5C3MM.CC 2601C-P94 PHOTONUCLEAR DATA SHEET 215
Fig. 4. Summary of results from the angular y-distribution measurements of the

9.61 —*0 and 9.61 —»0.44 MeV transitions from the £ =853 koV resonance

216
EM. f M. Tatsuya Saito

Nippon Kagaku Zaashi 92 , 164 (1971)

METHOD

Na

REF. NO.

23 11

71 Sa 1

REACTION RESULT EXCITATION

EN ERGY SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,N ABY 12-68 C 10-68 ACT

4PI

Nippon ICopoku ZossM. 92, 164—168(1971)

Th* Yields of Radioactivities Induced by If, ») Reaction*

with BremtstroMung up to 64 MeV

by Totsuyo SAITO

T l»c (y, *) yields of 12 tartlet nurlislci have been measured

at 10, 13, 16, 30, 45 and GO McV brcinssiraliiuug by otrerv*

inn tlic induced activities.

1 lie energy dependence of tl>e yield* ha* been invcMig.ucd

extensively in tlic jame way as in the previous work at 20 McV lirrnisxlrulilting. In (lie case of heavy nuclides, tin- yields rise greatly as a function of maximum bombarding energy up to 20 McV, and

rtse gradually from 20 McV up to till McV. llowcvcr. in tlic case of light nuclides, die yields rise greatly up to 30 McV, liecause the neutron separation energies of light ones arc larger than

those of heavy ones, and the bremsslrahlung spectrum covers

the giant resonance and so the yields rise gradually from 30 McV up to 66 McV.

The yields have approximately been, estimated from the parameter of the giant resonance, that is the prak cross section

ansi the half width, in order to comjiarc with tlic rx|XTiinrntal

data. As a result, tlic experimental data of light nuclides and

heavy ones are nearly in agreement with the estimated data

of Nathans ct al., Johns ct al. and Montaibclti et al., but iIkjsc of medium weight ones arc relatively lower values.

I: •»’Au(y,x)'**Au, 1 : 'flfy, *) IM I I: '*Mn(c,*)»Mn, If: “Na(y,/i)»iNa

T: '*0(r,»)'»0, * : 'tC(r, *)"C

Dtparlmtnl af Cktmuiry, Family »/ Seunet, Takokm Uatvtrnly; P5 3 O', a) Fi to KalaMra-tkm, SnJat-ifii, Japan

C

au*

a

« =r 3 v

*: T.tttt. ©= Johns f,, Q: Nathan* Qi Monlalbetti £> S (r.«)/25C»C^Oit«

fOSM N3S-418

ir Ev. 7-i 4-aai USCCMM.OC ’60I0-P64 PH0T0NUCLEAR DATA SHEET 217

U-S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU CF STANDARDS
C. P. Swann

Nucl* Phys. A167, 201 (1971)

EL EM. SYM.

Na 23 11

method REF. NO.

71 Sw 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,G LFT 7 D 7 SCD-D DST

5 LEVELS

SCATTERING ANGLE

Fig. 3. Results of angular distribution measurements. The curves drawn were the least-square fits with the A a and/or A* coefficients given.

FORM NBS-418

I R E V . 7-1 4- Q4

1

use omm-oc aeoio-p«<

Fig. 2. Level scheme of observed y-rays. The d.e. indicates that the double-escape peak was used in obtaining the energy. Given also are the branching ratios and some widths in eV for the ground stau. 21 8

transitions. The spins and parities for the levels from 3.916 down were taken from Poletti et al.

T ) and Maier et al. *).
EL. EM . SYM. I A D. L. Friesel , T.J. Lewis, and W. G. Phys. Rev. C6, 846 (1972)

METHOD

Miller

Na 23 11

REF. NO.

72 Pr 4 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G.G LIT 3-6 C 3-6 NAI-D 130

G-WIDTH, 5 LEVELS

Five levels In ,3Na were studied using nuclear resonance fluorescence. A previously reported level at 3.91 MeV was Identified as a doublet with levels at 3914.0* 1.8 and 3916.3* 1.8 keV. Levels of 5375.8* 2.7, 5742.7* 2.9, and 5768.3* 2.9 keV have widths (*D of 2.45iJ;J{,

1.291*;iJ, and 0.62tJ;j£ eV, respectively, as measured by self-absorption experiments. The

7-ray branching ratios for these levels were measured with a 40-cm3 Ge(Ll) spectrometer.

TABLE I. Experimental results.

Energy level (keV) Transition

(keV) Branching ratio (present work)

Branching ratio

(other work) 1 Transmission T - 0

b experimental Possible spin

g?

(meV)

3914.0 * 1.8 3914 0.81 0.730 0.665*0.058 (f)‘ 28*27

3918.3* 1.8 3913 0.81 0.730 0.322*0.054 (f)* 49*27

5375.8*2.7 5373 0.12*0.08 0.14 ±0.04 0.780 0.484 * 0.029 (f)

1 2450iJJ$ 4935 0.69*0.15 0.63*0.07

3297 0.19*0.07 0.23*0.05

5742.7*2.9 5743 0.71*0.13 0.60*0.10 0.7S6 0.298*0.012 1400tjjJ, 12901}^

5302 0.29*0.05 0.40*0.10

5768 J±2.9 5768 0.73*0.15 0.767 0.395*0.029 (f)

c 800i}J| 5327 0.27*0.13

’ Branching ratio* and spin# reported by Polettl et <d. (Refs. 1, 2, 8).

b Expected transmission If only electrode absorption were present (no resonant absorption).

e of f arbitrarily chosen to allow comparison with other widths.

^A. R. Poletti and D. F. H. Start, Fhys. Rev. 147 , 800 (1966).

?“A.R. Poletti, J.A. Becker, and R. E. McDonald,

Phys. Rev. £2, 964 (1970).

^A.R. Poletti et al. , Phys. Rev. 184. 1130 (1969).

form N3S-413

(R EV . 7-1 a-64) USCOMM.OC 2601C-P54 PHOTONUCLEAR DATA SHEET 219

U.S. DEPARTMENT OF COMMERCE

NATION AL BUREAU OF STANDARC:
'

£f»"
REF. N. Shikazono and Y. Kawarasaki

Nucl. Phys. A188, 461 (1972)

c.. c.M. jiM,

Na 23 11

METHOD REF. NO.

72 Sh 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECT 0 R angle TYPE RANGE type range

G^G/ SPC 0-14 G 14 SCD-D 87

Table 2 Gamma-rays resulting from the photon bombardment of a NaOH target

Observed Relative Transition (MeV) peak intensity

:.9s F 19 —7 2.98 — 0

4.43 D, S, F 89 -4 4.43 — 0

4.94 D. S. F 14.7 ±1.5. 5.38 — 0.44

5 30 O. S. F 7.7-1.

5.74 — 0.44

5.33 D. S, F 6.3 ±1.6 5.77 — 0.44

5.74 D. S, F 27.3 — 1.2 5.74 — 0

5.77 D. S. F 15.1-1.2 5.77 — 0

6.30 (D) 3.4 — 0.8 8.37 — 2.07

6.64 (D) 3.4 ± 1.0 7.09 — 0.44

6.70 D. (S) 2.8 -0.9 7.14 — 0.44

6.74 D, S. (F) 8. 6-0.9 6.74 — 0

7.07 D. (S). F 10.8 —0:7 7.07 — 0

7.09 D. S. F 9.3 -0.7 7.09 — 0

7.14 D. S. ( F) 11.5-0.8 7. 1 4 — 0

7.46 D. S. F 10.6±0.8 ".90 — 0.44

7.57 D. (S) 2.7 —0.7 7.5" — 0

7.90 D. S. F 18.5-0.8 7.90 — 0

7.93 (D>. (S) 7.3 ±0.7 8.37 — 0.44

8.37 D, S 12.0—0.7 8.37—0

8.65 D 6.5 ±0.6 3.65 —0

8.67 D. S 12.7-0.6 8.67 — 0

9.15 D 7.5 -0.6 9.15—0

(over)

FORM N3S-4 19 'REV. 7-1 4-54) G5C CMM-O C 26 0 t 0- P6 4 PHOTONUCLEAR DATA SHEET 220J.3. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Table 6 Excitation energies and ground state transition widths obtained from the 2J Na(}v/)22 Na reaction

Excitation energy (keV) J” ; T Fyo/Ty *) (2J+l)r./0 (eV) “)

present work

previous work

present work

previous work

2979=6 2985 ± 6

c

) (D ') 0.51 c

) 0.2C1 =0.08 0.28 =0.04 ') 4426=4 4431 ± 5

c

) d

) 0.95 c ) 5.0 =0.8 4.3 =0.5 e

) 5376=4 5378 ± 5 *) i

+ f

) 0.13=0.01 *) 1.6 =0.3

5744 =4 5738= 8

e

) (§. *)

+ h

) 0.78 ±0.04 3.7 ±0.7

5768 =4 5762= 8

e

) 0.70=0.06 2.1 ±0.4 6739=4 6731 = 8 ') (b iV ') 1.0 1.5 =0.3 7074=5 7075= 2

J )J ) 1.0 3.0 =0.5 “) 4. 1 =0.8 >) 7086 = 5 7086= 2

J ) r J ) 0.75=0.06 l ) 3.4 ±0.7 *> 4.4=0.9 J )

| 3. 7-0.4 c

) 7137 = 5 7138= 2

J ) (t, i, i)

J ) 0.80±0.05 3.8 ±0.7 *) 13.4-0.7 J ) 7572 = 6 7563= 7 ') 1.0 0.7 =0.2

7896 = 5 7900=21 m

) r = i m

) 0.67±0.02 11 -L-2 8367 = 5 8357= 8 *) lb i) 0.53=0.03 n

) 12 4-2 8652 = 6 8643= 7

e ) 1.0 3.1 ±0.6

8669 = 5 8659±30 4

+

, T= §

a

) 1.0 6.5 = 1-1 9147 = 5 1.0 5.2 =0.9 °)

*) The branchings are obtained from the relative intensities observed at the scattering angle of

87°. The effect of the angular distribution of the y-rays is not taken into account.

°) The error for (27=1)/°,,0 only includes the statistical error. An estimate of the uncertainty

associated with the shape of the incident bremsstrahlung is not included.

c

) Ref. 8

). “) Ref. 18

). ') Ref. 19

>.

') Ref. 31

).

!

) Ref. 32

).

ft ) Ref. 33

).

') Ref. 8

). The energy of the state is given as 6727 =20 keV in ref. 8

).

J ) Ref. 20

). k

) This value is calculated by using the result of the angular distribution measurement given in

ref. 20

).

') This value is calculated on the assumption that the transitions to lower states are of pure

dipole character.

ra

) Ref. 17

). ") The 8.37 MeV state decays to three lower states. The branching to the 0.44 and 2.07 MeV states are 0.32 = 0.03 and 0.15=0.03, respectively.

°) The value given is not the (27— \)T./0 but the (2J— I ) 77, 0

/!.,//’ value.

^P.M. Endt et al. Nucl. Phys. A105 (1967) 1. ^J. C. Hardy et al. Fhys. Rev. 183 (1969) 834.

X ^J. Dubois, Nucl. Phys. A104 (1967) 657.

^H. J. Hay et al. Nucl. Phys. A98 (1967) 330.

20

C. P. Swann, Nucl. Phys. A167 (1971) 201.

^E. Kramer et al. Nucl. Phys. A165 (1971) 353.

da Silva et al. Nucl. Phys. A168 (1971) 663.

^A. R. Poletti et al. Phys. Rev. 184 (1969) 1130.

221
Z. B. du Toit, p. R. de Kock, J. H. Hough, and W. L. Mouton

Z. Physik 255 , 97 (1972) Na 23 11

METHOD REF. NO.

7 2 To 3 egf

REACTION RESUL T excitation

ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE type range

G.MU-T LIT 9 D 9 NAI-D 4PI

9.404, 9.700 MEV

Gamma rays of energy 9.404 and 9.700 MeV were obtained from the reaction “Ne(p, yi^Na at proton energies of 640 and 950 keV respectively and were resonantly absorbed in sodium metal. Isotopically separated “Ne targets on nickel backings wen used. The following level widths for uNa were obtained: The 9.404 MeV level:

The 9.700 MeV level:

65 ±40eV

r,- 2.2 ±0.7 eV.

T= 9.5 +4.5 eV - 1.0 r, 5.6+ 1.2 eV. - 0.8

The disagreement between the results for the 9.404 MeV level and the previously determined values can probably be ascribed to proton scattering in the window of the gas target used in the latter measurement.

FORM N3S-418 REV. 7-14- 64) USCCMM-OC 25G1C-P64 PH0T0NUCLEAR DATA SHEET 222

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAUOF STANCARC5

REF. M. Viitasalo, M. Piiparinen and A.

Z. Physik 250, 387 (1972)

METHOD

Anttila

Na

REF. NO.

23 11

72 Vi 1 egf

REACTION RESULT

EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

P,G NOX 9-10 D 0-1 SCD-D DST

4 LEVELS, J-PI

Table 1. Experimental angular distribution coefficients Resonance Transition a2 °4 £,= 897 keV r — 0 0.68 + 0.08 0.12-0.08 £x = 9652 keV r — 440 0.74 + 0.06 0.06 + 0.06

r — 4775 -0.05 ±0.05 — 0.09 + 0.07 4775 -* 440 0.18 + 0 06 -0.17 + 0.07 4775 — 2076 0.33 + 0.14 0.02-0.13 £, = 1 006 keV r -» 0 0.22-0.05 -0.10+0.06 £x = 9756 keV r — 440 — 0.22; 0.04 0.07- 0.05

r — 2640 — 0.44 = 0.02 0.01 -0.03

r — 3678 0.41+0.04 -0.03 - 0.04

r — 3846 0.12 + 0.05 0.03-0.06

3 846 — 2076 -0.23 + 0.04 0.02-0.04

3678 — 440 0.07 + 0 03 -0.08 + 0.03 2640 — 0 0.00+0.02 -0.03-0.03 £,= 1091 keV r — 0 0.72 -r 0.04 0.00-0.03 £, = 9838 keV r — 440 -0.16 ±0.05 -0.09-0.05

r — 2391 -0.06; 0.05 -0.06-0.06

r — 3913 — 0.06; 0.10 0.02-0.1

r 4430 -»0. 14; 0.07 0.02-0.08 4430 — 0 0.01 ; 0.08 0.08 - 0.09 3913 — 0 -0.08 ±0.06 0.03 - 0.07 2391 — 440 0.05 ±0.06 -0.01 -0.0"

2391 — 0 0 05-0.05 -0.03-0.06 £,= 1 278 keV r — 0 —0.64 + 0.08 0.40-0.10 £,= 10016 keV r — 440 0.22; 0.03 0.01 - 0.03

r — 2076 0.27 ±0.04 -0.02+0.04

r — 2983 -0.43; 0.02 0.00-0.02

r — 3678 - 0.40 ± 0.02 0.03-0.03

r —* 3 846 0.36; 0.07 0.0! - 0.0’

r —* 3 913 0.51 ±0.03 -0.03 -0 03

r — 6617 0.25 ±0.1

0.14 + 0.15 6617 — 440 -0.07; 0.06 -0.16-0.07

3913 — 0 -0.05; 0 02 0.01 - 0.02

3 846 — 2076 -0.03; 0.06 -0.01 -0.07

3678 — 440 -0.05; 0.02 0.03 - 0.03 3678 — 2640 -0.58 ±0.03 -0.01 -0.04

2983 — 0 0.44; 0.04 -0.04-0.04

2983 — 440 — 0. 19 ; 0.04 0.06 ±0 04

W(9) = 1 + a p + a P

2 2 4 4

FORM N3S-418

(REV. "-I 4-64) 'JSCOMM-OC 2601C-P64

(over)

U.S. DEPARTMENT OF COMMERC

NATIONAL BUREAU OF 5TAN0ARC

PHOTONUCLEAR DATA SHEET 223
Table 2. Multipole mixing ratios S of the primary gamma-rays from the resonance

levels measured in the present investigation

Resonance Transition (£x

in keV)

Mixing ratio

<5

£,= 897 keV r — 0 5/2 — 3/2 0.63 + 0.03 £x = 0652 keV r — 440 5/2 - 5/2 0.30 + 0.04

r — 4775 5/2 - 7/2 -0.07 + 0.03 Ep = 1 006 keV r — 0 3/2 - 3/2 -0.11+ 0.02 £x = 9756 keV 7.0 +0.5

r -* 440 3/2 - 5/2 0.10;; 0.01 -9.0 ± 1.0

r — 2640 3/2 - 1/2 0.04 + 0.02

r -* 3678 3/2 - 3/2 0.01+0.02

3.9 +0.4

r — 3846 3/2 - 5/2 — 0.19 + 0.04

3/2 - 7/2 0.03 + 0.02 £,= 1091 keV r — 0 3/2 - 3/2 0.25 + 0.02 £x = 9838 keV 2.0 +0.1

r - 440 3/2 5/2 0.04+0.02 -6.0 +0.5

r — 2391 3/2 - 1/2 0.24 ±0.06 -3.2 ±0.5

r - 3913 3/2 - 3/2 -0.28 ±0.03 -18.0 ±3.0

3/2 — 5/2 -0.03 ±0.07 -4.3 +0.7

r — 4430 3/2 - 1/2 0.19 ±0.03 -3.2 ±0.2

3/2 - 3/2 -0.38 ±0.08 - 11.0 +1.0 £ = l 278 keV r — 0 5/2 - 3/2 -2.0 +0.2 £,= 10016 keV r — 440 5/2 - 5/2 -0.20 + 0.02

r — 2076 5/2 - 7/2 -0.30+0.03

r — 2983 5/2 - 3/2 -0.01+0.01

r -* 3678 5/2 - 3/2 0.00+0.01

r — 3846 5/2 - 5/2 -0.06 ±0.03

5/2 - 7/2 -0.50+0.05

r — 3913 5/2 5/2 0.05 + 0.02

r — 6617 5/2 - 7/2 -0.25 ±0.05 -3.0 ±0.3

224
S. Ventura

Fhys. Rev. C7, 1900 (1973)

REF. ELEM. SYM. A Z

METHOD

Na

REF. NO.

23 11

73 Ve 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

P,G ABX 14- 26 D 5- 18 NAI-D 90

G = GO + G1

777

FIG. 2. (a) Photoneutron cross section for JS N'a as measured by Alvarez etal. (Ref. 8). (b) Differential cross section as a function of photon energy for *'Xe(p, + y^^Xa at =90". The yield curve has been converted to a photodisintegrsrion curve (In the conversion la used for the photon energy).

The differential cross section for the capture reaction a Ne(j>, + 7 ( ) 33Na has been measured. Significant structure i3 observed In the giant- resonance region. Comparison with

the reaction ^Naftr.nJ^Ne indicatss a splitting of the dipole strength. Possible sources of

this splitting are discussed.

-o pm NSS-418

(R EV . 7.1 A-t4) use CMM-N as-oc PHOTONUCLEA.R DATA SHEET 225

u.s. department of commence

NATIONAL BUREAU OF STANDARDS
REF. V. DiNapoli and M.L. Terranova

J. Inorg. Nucl. Chem. _36, 3633 (1974) Na 23 11

method REF. NO.

74 Di 7 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.3P3N ABY THR* 1 C 300* 1 ACT- 1 4PT

1=1 GEV

bremsstrahlung energy (GeVJ

Fig. I. Cross section per equivalent quantum aQ

vs the bremsstrahlung maximum energy. Curve a is an eye-fit of

the present work values (open circles) for the reaction

J3 Naly. 2p 3n) ls F. Curve b is an eve-fit of the present work

values (open triangles) and the values taken from Ref. f2]

(filled triangles) for the reaction 27AI(y, 2p 3n)22 Na. Curve c

is the best- fit of the present work values and values taken from

Refs. ‘IS. 20-22' for the reaction i; C(y. 2p 3n)"Be: for the sake of simplicity, experimental points have not been

reported. Curve d is an eve-fit of the present work values (reserved open triangles) for the reaction 16 0(y, 2p3n)“C.

V. di Napoli, A.M. Lacerenza,

F. Salvetti, H.G. de Carvalho,

and J.B. Martins, Nuovo Cimento

Lettere 1, 835 (1971)

.

18

V. di Napoli, D. Margadonna,

F. Salvetti, H.G. de Carvalho, and

J.B. Martins, Nucl . Inst. Meth. 93 , 77 (1971). —

20

V. di Napoli, F. Dobici, 0. Forina,

F. Salvetti and H.G. de Carvalho, Lett.

Nuovo Cimento 55B , 95 (1968) . 21

V. di Napoli, Nucl . Inst . Meth . 69 , 155 (1969).

22

V.I. Noga, Yu.N. Ranyuk, P.V. Sorokin,

and V . A . Tkachenko, Ukr. J.Phvs. 16 , 1850 (1971) in Russian.

form N3S-4 18 (REV. 7-14-64) U5C O MM- O C 26010-P64 PHOTONUCLEAR DATA SHEET 226

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
EL EM. 5 VM. A Z A. Veyssiere, H. Beil, R. Bergere, P. Carlos, A. A. De Miniac

Nucl. Phys. A227 , 513 (1974)

METHOD

Lepretre, and

Na 23 11

REF. NO. 74 Ve 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE type range

* G,N ABX 12- 30 D 12- 30 BF3-I 4PI ** G,2N ABX 23- 30 D 23- 30 BF3-I 4PI

* 885+

** 884

233 +

Fig. 5. Photoneutron cross sections cr r „ and rs(y, In) of 2J Na.

t

'o7»-“¥

0.7 -

.H

C. 6 1—

0.4)

f

7

*t i

0.31.

0.2 tot s

**•

20 30 4G 50 A

Fig. 22. Ratio of experimental integrated photoneutron cross section u0

" over the Thomas, Rctche and Kuhn sum rule [0.06 NZ A], Numerical values and upper integration iimits are taken from

tabie 3. Also JcTo" = — 7°' for all nuclei.

( over)

J.S. OEPAHTMENTOr COMMERCE

NATIONAL BUREAU O f 5TANOAROS

22 7
Fig. 24. The [cro

n /(0.06 NZ'.A )] ratio as a function of isospin T. Possible overall errors ol ± are

to be applied to all nuclei shown.

Table 3 Experimental integrated photoncutron cross sections = jg M '7Tn (£)d£ compared with the

classical sum rule [0.06 NZA ] of Thomas, Reich and Kuhn

N II o r = J r- } r= 2j T = j Nucleus 16 0

20 Ne 23 Si 32 S *°Ca I9p 2J Na :7 A1 aip 39 K *-*Sc *°Ar : -M V

n-o” 53 42 94 93 100 103 137 15S 1 S 2 210

j 333 393 ; 602 (McV • mb) i —4 ±i ±1 ±7 =7 ±7 -9 — 10 = 12 ±14 • — 25 - —28

i -42

(To"/ (0.0 6.VZM) 1 0.24 0.14 0.22 0.21 0.17 0.33 0.40 0.59 0.39 0.36

| 0.57 1 0.66 0.8 £m (McV) i 30 26.7 50 30 29.5 29 30 30 29 50 23.1 26.7 23

223
0

«

1

<

e

«

i

i

ii

i

REF.

METHOD

V. di Napoli, G. Rosa, F. Salvetti,

H. G. de Carvalho, J. B. Martins,

J. Inorg. Nucl. Cfaem. 37, 1101 (75)

M. L. Terranova,

O. A. P. Tavares

ELEM. STM.

Na

*

23

z

11

REF. NO. 75 Di 4 egf

REACTION RESUL T EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.Fia ABY 21-999 c 300-999 ACT-I 4PI

G,NA22 ABY 12-999 c 300-999 ACT-I 4PI

'crgar mass -.-net

Fig. 2. Mean absolute cross section of "F photoproduction vs the

target mass number. Open lriancie: energy range 0- 15-0-72 GeV.

Ref. [18]. Filled circle: energy range 0-3-1 GeV, Ref. [3]. Open

circles: present work. The curse has been calculated by means of Hqn ( 1 ).

23 30 35

Target mess n-jmse*

Fig. 3. Mean absolute cross section of

! 'N'a photoprcduction vs

the target mass number. The curve has beer, calculated by means

ofEqn(l).

9^9 = 1 GEV

Table 2. Cross-section per equivalent quantum o-o(jib) of photoproduction of “F

Target

nucleus

Bremsstrahiung maximum energy £0 (GeV)

0-30 0-40 0-55 0-75 1-00

"Na 590 c: 30 640 = 30 720 = 30 780 = 30 330 = 30 "AI* 116 = 7 172 = 6 202 = 6 245=5 270 = 5 "Si 80=10 110=10 145 = 10 170 m 10 200= 10 "? 60=10 9*3=10 130=10 150=10 180 = 10 ”S 55 = 10 90=10 125 = 10 160=10 190=10 "J,CI 185 = 20 230 = 20 270 = 20 310 = 20 350 = 20 ”K 35 = 5 50 = 5 65=5 75 = 5 90 = 5 “Ca 5 = 2 20 = 3 35 = 5 45 = 5 60 = 5

•The results for "Al have already been published fsee[3j) and

are reported for comparison.

25 30 35 -aa

Target mess numSer

Fig. 4. Mean absolute cross section of "Na photoproduction vs

the target mass number. Filled circles: energy range 0-I-! GeV.

Ref. [20]. Reversad open triangle: energy range 0-3—1 GeV. Ref.

[8]. Open triangles: energy range 0-25-1 GeV, Ref. [19]. Open

circles: present work. The curve has been calculated by means of Eqn(l). (over)

use qmm-n as-o

PHOTONUCLEAR DATA SHEET 229

U.S. DEPAR7MENT0F COMMERCE

NATIONAL BUREAU OP STANDARDS
Table 3. Cross-section per equivalent quantum <7<j(/ib) of

photoproduction of "Na

Brcmsstrahiung maximum energy £»(GeV)

Target

nucleus 0-30 0-40 0-55 0-75 100

”A1 490 = 20 560 = 20 667=20 690 = 20 745 = 20 “Si 290 = 20 330 = 20 3;0=20 430 = 20 470=20

lip 230 -20 250 = 20 290 = 20 330 = 20 350=20 r

-s 206=10 240=10 220 = 10 320=10 350=10

,5J7ci 230=10 260=10 290 = 10 320 = 10 350 = 10 % 30=3 50 = 5 65=5 80=5 100=5

"“Ca 5=2 20=3 45 = 5 60 = 5 60=5

Table 4. Cross-section per eouivalent quantum <r<,(ub) of

photoproducrion of “Na

Dt Bremsstmhlucg maximum energy £„ (GeV)

-T- _ _rr a*

nucleus 0-30 0-40 0-55 0-75 1-00

77AI* 370=10 440=10 500 =20 550 = 20 660 = 20 “Si ICO =10 140=10 160=10 210=10 240= tO

5: P 100=20 160 = 20 200 = 20 270 = 20 310 = 20 n

S 120 = 10 160=10 1S0=10 210=10 240=10

UJ7

C! 65 = 10 100=10 140=10 190=10 220=10 "K 20=5 35=5 55 = 5 65=5 20 = 5 *Ca 12=3 25 = 5 35 = 5 50 = 5 60 = 5

"The resuits for

27A1 have already been published (see (Si) and

are reported for comparison.

Table 5. Meaa absolute cross-section

in the energy range 0-3-1 GeV

Target

nucleus

Produced radionuclide “F “Na “Na

“Na

EAl*

190 = 30 120= 10 200=20 220 = 20

“Si 100=10 L50=20 120 = 10

J.p loo =10 100 = 20 ISO = 20 n

s 110=10 120=10 100=10

nj7

CI 135 = 20 100=10 130=10 ”K 45=5 60 = 5 50 = 5 "Ca 46=5 60 = 5 40 = 5

•The results fdr the photoproducrion of “F

and “Na from 17A1 have already been

published (Rei(3] and [3]. respectively).

2. V. di N'apoli and M. L. Terranova, J. inorg. nucl Chem. 36, 3633

(1974).

3. V. di Napoli, A. M. Lacerenza, F. Salvetti, S. M. Terenri, H.

G. de Carvalho and J. B. Martins, J. inorg. nucL Ckem. 35, 1419 (1973).

4. C. M. Lederer, J. M. Hollander and I. Perlman, Table of

Isotopes. 6th Edn Wiley, New York (1967).

5. R. G. Korteling and A. A. Caretto, Jr., J. inorg. nucL Court. 29, 2S63 (1967).

6. R. G. Kortelir.g and A. A. Caretto, Jr., Phys. Rev. Cl, 193

(1970).

7. R. G. Korteling and A. A. Caretto, Jr., Phys. Rev. Cl, 1960

(1970).

8. V. di Napoli, A. M. Lacerenza, F. Salvetti, H. G. de Carvalho

and J. B. Martins, Lett. Nuovo Cimento 1, 835 (1971).

9. I. Halpern, R. J. Debs, J. T. Eisinger, A. W. Fairhall and H. G.

Richter, Phys. Rev. 97, 1327 (1955).

10. C. 3. Fulmer, K. S. Toth, I. R. Williams, T. H. Handley. C. F.

Dell. E. L. CaJiis, T. M. Jenkins and J. M. WyckoiT, Phys. Rea.

C2, 1371 (1970).

11. G. J. Kumbartzki, U. Kim and C. K. Kwan, Nucl Phys. A160,

237 (1970).

12. G. J. Kumbartzki and U. Kim, NucL Phys. A176, 23 (1971).

13. K. Lindgrea and G. G. Jonsson, NucL Phys. A197, 71 (1972).

14. C. E. Roos and V. Z. Peterson, Phys. Rev. 124, 1610(1961).

15. T. A. Gabriel and R. G. Alsmiller, Jr., Phys. Rev. 182, 1035

(1969).

16. G. G. Jonsson and K. Lindgien, Phys. Scr. 7, 49 (1973).

17. G. Rudstam, Z Naturf. 21a, 1027 (1966).

IS. A. Masaike, J. phys. Soc. Japan 19, 427 (1964).

19. A. Jarund, B. Friberg and B. Forkman, Private communication to G. G. Jonsson and K. Lindgren, quoted in Ref.[16]; see

also A. Jarund. B. Friberg and B. Forkman. University of Lund Report No. LUNP-7303, 1973 (unpublished).

20. V. I. Noga, Yu. N. Ranyuk and P. V. Sorokin. YadL Ftz. 9, 1152 (1969) (transit Sov. J. SucL Phys. 9, 673 (19691). 21. T. Methasiri and S. A. E. Johansson, NucL Phys. AI67, 97

(1971).

22. J. R. Nix and E. Sassi, NucL Phys. 81, 61 (1966).

23. W. D. Myers and W. J. Swiatecki, NucL Phys. 81, 1 (1966).

230
ref. K. Masumoto, T Kato, N. Suzuki EL EM. SYM.

1 A Nucl . Inst. Meth. 157, 567 (1978)

Na 23

METHOD REF. NO.

n

78 Ma 10 hg

REACTION EXCITATION SOURCE OETECTOR

RESUL T ANGLE

EN ERGY TYPE RANGE TY PE RANGE

G,N ABY 12-68 C 30-68 ACT -I 4PI

Analysis is made of reactions interfering with

photon activation analysis procedures.

The activation yield curves have been presented for a number of photonuclear reactions in the energy range from 30 to 68 MeV, in order to evaluate quantitatively the interferences due to competing reactions in multielement photon activation

analysis. The general features of the yields as functions of both target mass number and excitation energy were elucidated from the data obtained, discussion being given on the results in terms of the reaction mechanism.

Simultaneous neutron activation due to appreciable neutron production from the converter ana surrounding materials has also been studied, and, finally, the magnitudes of interferences in real multielement analysis were given in the form

of their energy dependences.

30 40 =0 60 70

E max (M eV ) Fig. 3 Activation yield curves for the reactions on C. Na. Mg

and A

- |'C(y. n) n C. a

1 3 cf >•

. am Be. a ^Nai;1 . n) 22 Na,

3 Mgr/. pi :4 Na. •

24 Mg(y, pn>2: Na. A

2

’ Ally. cm)22 Na. 7

2 AI - 22 Na.

N3S-418

(over)

.5. Cc s AA T Mfv r Of :OVM£SCE

231
(

A»H

Mew 3

Fig. 9 Yields of the (y. n) reactions as a function of bremsstrahlung maximum energy and target mass number. The

numerical values in the figure are yields per equivalent quanta

in mb.

Distance Irom th* converter ( cm )

Fig. 13. Production rates of the neutron reactions and the photonuclear reactions as a function of distance from the converter in vertical and lateral directions. Z "Mnln. ;')-' 6 V1n, • -•’Natn. ;

, ) ;4 Na. i Altn. a’)*

4 Na. I Mnty. n)-

4 \1n. Z

:3 Na(y, n) 22 Na. -'Cut y, ni'

,J Cu.

J 2

Fig. 12. The reaction yields leading to :: Na as a function of

difference in atomic number between target and product nuclides

232
i

]

i]

c

a

«

c

g

a

c

d

i]

a

i

d

d

el

kef. B.S. Ishkhanov, V.I. Mokeev, Yu. A. Novikov,

I.M. Piskarev, A.M. Parlag, A. I. Gutii

Sov. J. Nucl . Phys. 32_, 455 (1980)

Yad. Fiz. 32, 885 (1980)

method

E.S. Qmarov, EL EM. SYM. A Z

Na

REF. NO.

23 11

80 Is 2 hg

reaction RESULT excitation SOURCE OETECTOR

ENERGY TYPE range TYPE RANGE ANGLE

G,PG/ ABI 8-32 C 13-32 SCD-D 135

G,NG/ ABI 12-32 C 13-32 SCD-D 135

Energy spectra of photons from the reaction Jfy') have been measured. Integrated cross sections have

been determined for population of the individual levels of the nuclei 1J Na and ^Ne. The energy dependence of

the cross section tor excitation of the 1.27-MeV level of the aNe nucleus in the \Yjrf') reaction is obtained. The results are compared with spectroscopic data existing in the literature.

(G,PG/)

(G,NG/)

ABI FOR 5 LEVELS

ABI FOR 3 LEVELS

PACS numbers; 23.20. 4- y, 27.30. + t

TABLE I. Levels populated in the reaction ^Nafy.Xy') at Emu = 32 MeV.

Ex. MeV ( Ref. 2) Firul nucleus J*. r fi

In c rented cron

section. MeV • mb

(present work)

Spectroscopic tictonC* S

IM PI

1.27*0.01 2* 15*4 1 2

336*0 03 4* 5*2 0.41

4.** :, Ne 2> <2 0.1S-0J

5.15 2- <20 *

1.7 333,5 36: 1 5.52. 5.54: } <1 _

5.92 J

1 35*0.02 2+ 1 5*2 1.2

5 60*0 04 “Ns (1.2)* 2*1 006

5.71*0.04 2*1 -

TABLE II. Values of errors in determination of the inte^ grated cross section for population of levels

Photon enerfjr, MeV

Error. MeV . mb

055 10

1.0 5

1.5 3 2—4 2 5-6 1

•Obtained on the assumption that the level width s 200 keV.

.. '"3

[ 2000

J1;.| '2 to I* :.o ;_r z : ij S.7 s.s

-j, M«V

FIG. 1. Portions of the energy spectrum of y rays from the reaction 3 Naty,Jfy /) for a bremsstranlung maximum energy

32 MeV. The numoers by the arrows are values o{£x .

FIG. 2. Differential cross section for the reaction ^Nafy.py'),

leading to population of the 1.27-MeV level of the :: Ne nucleus.

form M 3 S-413

If* £ V. 7* I 4« 641 USC OMM-N SS-OC PHOTOHUCLEAR DATA SHEET 233

U.S. DEPARTMENT OF COMMERC

MATIONAU SURSAUOF STANDARD
REF. M. Yagi , R. Amano

Int. J. Applied Radiat. Isotopes 31_, 559 (1980)

EL EM. SYM. A

Na 23 11 METHOD REF. NO. 80 Ya 2 hg

reaction RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,FI8 YLD THR-60 C 30-60 ACT1

4PI

The production rates of l8 F by the 20 Ne(y, pn) l8 F plus 20Ne(y, 2/i)‘

8 Ne -» 18 F.

22 Na(y, i/i) 18 F, and

,9 F(y. n)‘*F reactions were determined as a function of the maximum bremsstrahlung energies between

30 and 60 MeV. In addition, a simple and fast method to prepare anhydrous H‘ 8 F was studied by using KHF2 target.

Taule 1. Photonuclear reactions for

18 F production

Target nuclide (abundance. J „)

Threshold energy

Reaction type (MeV) Product nuclide

20 Nel90.5tl (y. 2/i 21 Ne (0.27) ly. 3/r) 22 Ne 19.22) (y. -in) :o Ne (90.51) (y. P»>

2 'Ne 10.27) (y. p-1 ') 22 Ne 19.22) (y. pi '

0

2J Na (100) (y. in)

,,5 F(10O) (y. nl

28.50

l8 Ne —

•

' 8 F

35.27

,3 Ne — 1

8

F

45.63

1

8

Ne —*

18 F

23.26

,9 F

29.93

1

8

F

40.38

' B F

20.89

' 3 F

10.43

1

8

F

Fig. 1 Production rates of '"F on Ne. Na and F targets as

a function of the maximum bremsstrahlung energy.

popu N3S-413

(REV. 7-1 4»64> USCOMM-NBS-OC PHOTONUCLEAR DATA SHEET 234

CI.S. DEPARTMENT CF COMMERCE

NATIONAL BUREAU OF STANOAROS
1

t

I

1

i

«

i

*tr. B.S. Ishkhanov, I.M. Kapitonov, V.I. Shvedunov, A. I. Gutii,

A.M. Parlag

Sov, J, Nucl . Phys. 33, 303 (1981)

Yad. Fiz. 33, 581 (1981)

methoo

EL EM. SYM.

Na 23

RE£. NO.

81 Is 3

11

hg

EXCITATION ENERGY

SOURCE OETECT O R REACTION RESULT TYPE RANGE TYPE RANGE ANGLE

G,P ABX 8-30 C 16-30 TEL-D 90

Total c(y,p) obtained by sutrming the various photoproton cross sections and multiplying by 4tt,

/*29 .5

/ a(y,p)dE=190±20 MEV-mb

•'Th

The photoproton spectra from :)Na have been measured in a bremsstrahlung beam. The bremsstrahlung maximum energy was vaned over the range 16-30 MeV in 1-MeV steps. The photoproton spectra were

analyzed to obtain cross sections for the reaction "Naly.pP’Ne with formation of the final nucleus in various

states The experimental results are interpreted on the basis of spectroscopic information on the low-lying

levels of ;: Ne obtained in the reaction ;: Naid. ‘HerNe. An estimate is given of the contribution of \p-\h

configurations to formation of the proton channel of decay of the giant dipoie resonance of !J Na. The centers

of gravity of the electric dipole transitions from various shells are determined. PACS numbers: 25.20. + y, 27.30. + t. 23.20.Lv

111

r

ijii, !

L If

J J L !

1 i( w L d

l i|iii ;7L :!li

1 Of -

1 l7 j

;i i

«

i

fe

M

«

sfi

«

i i'l

1.0 MeV

i||. J j| ,

\ j'!, ;li|iij mlMm' ft m

II . ; :f

. t. 'I

*.

If* if,i

JS MeV

f,' ' 2

7 MeV

iiyiN i-i

a. a:

'V 15 13' 2j 21 25 23

TIG. 4. Cross section for the reaction :3 N

T a(y, p) 25 Ne with formation of the final nucleus in the ground state (a), first excited state <b), second excited state (c). and also in the group

of states at energy 3.0 MeV (d). The solid line in Fig. 4b shows the cross section obtained in Hef. 11.

£*=118 MeV

,i|;,

-'.j

;•

i

3. 2

3 —

IJ j-

£ J 2

l- c* i

-

«^ J

,3 !' —1#!!

ill

11 '"

r .* ij

L

l. S. 9

L j

*•

r

-r

1

|

'*

• ;i ." 'ill 'Mljl

II 23 12 21 is ;/ 23 f,. MeV

FIG. 5. Cross sections for the reaction 23 Na(y,p) 2J Ne with formation of the final nucleus in groups of states at energies

6.3. 8.9 and 11.8 MeV.

(OVER)

row** N8S-41I

(R C V . 7-1 4-44) USC OMM-N BS*0 C

U.5. OEPARTMCNTOF COMMERCE

NATIONAL OUREAUOr 3TANOAROS PHOTONUCLEAR DATA SHEET 235
/'

I

aij.pi * sif.i’l

E MeV

FIG. 6. Total cross section for the reaction I3 Na(y,/>) JJNe

(lower figure) and cross section for absorption of photons by nNa (upper figure) obtained by summation of the photoproton and photoneutron cross sections. 1,1 The latter is shown by the solid line in the lower figure.

236
'I

«

«

6

a

c

A.M.

Yad.

Sov

METHOO

Ishkhanov, I.M. Kapitonov, V.I. Shvedunov,

Parlag

Fiz. 33, 581 (1981)

J. Nucl . Phys. 33, 303 (1981 )

A. I. Gutii, EL EM. SYM. A Z

Na

REF. NO.

23 11

81 Is 8 egf

EXCITATION SOURCE OETECTOR

REACTION RESULT ENERGY TYPE RANGE TYPE RANGE ANGLE

G,P0 ABX 12-29 C 16-30 TEL-D 90

G,P1 ABX 14-29 c 16-30 TEL-D 90

G,P2 ABX 16-29 c 16-30 TEL-D 90

G,PN ABX 19-29 c 16-30 TEL-D 90

The photoproton spectra from :) Na have been measured in a bremsstrahlung beam. The bremsstrahlung maximum energy was varied over the range 16-30 MeV in 1-NleV steps. The photoproton spectra were

analyzed to obtain cross sections for the reaction :j Naly, p)

i: Ne with formation of the final nucleus in various

states. The experimental results are interpreted on the basis of spectroscopic information on the low-lying

levels of :: Ne obtained in the reaction ;j Naid. J Her: Ne. An estimate is given of the contribution of \p-\h

configurations to formation of the proton channel of decay of the giant dipole resonance of ;l Na. The centers of gravity of the electnc dipole transitions from various shells are determir.ed. PACS numbers: 25.20. + y. 27 30. + t. 23.20.Lv

[ f* = lia MeV 0'h

I

0 zji

«

if]

*

si

M

•2 u 'i 2. 22 Z» 22 21

FIG. 4 . Cross section for the reaction :3 N'a(Y,p)"J Ne with formation of the finai nucleus in the ground state la), first excited state tb), second excited state (c>, ana also in the group

of states at energy 5.0 MeV id). The solid line in Fig 4o shows the cross section obtained in Ref. 11.

r C 9M H3S-4 II P £ V . 7 * 1 4* 64) ^SCOMM.QC 20010-P64

I

5.9

L

-

, J* r ul i

• i

’ la ;* :s .j jo

, MeV

FIG. 5. Cross sections for the reaction 33 Na(y, p)"Ne with formation of the final nucleus in groups of states at energies

<5.9, 9 9 and 11.8 MeV.

TABLE I. Energy resolution of partial cross sections and

probability of formation of the - : Se nucleus in various states.

Encrey t k of a final state ot (he Number of partial cross secNe nucleus or cenrer ol eruviry - k the ircup oi stales. MeV Enerzy resolution. MeV Probability non « £ -

1 •

,.4 0 1*2 2 i 1.27 0.3 0 12

3 I

- 30

,

1.0 0. 1

4 IS

J

5.0 t 2 0 tb

5 R9 1.3 0 27

6 *0 1.3 o.i; US 2 0 0.16

u.s. department z NAT’ONAU 5URS1LO- 5 T

(OVER)

CMMEFCE PHOTONUCLEAR DATA SHEET 237
III

1

,r ai/.fi * ti/.n

a

f/i M«V

FIG. 6. Total cross section for the reaction 23 Na(y,/>) :J Ne

(lower figure) and cross section for absorption of photons by

23 Na (upper figure) obtained by summation of the photoproton and photoneutron cross sections.2,8 The latter is shown by the solid line in the lower figure.

A
«

«

«

«

i

<

e

c

«

i

i

i

i

i

i

i

tf

p

«

ref. B.S. Ishkhanov, Yu. A. fjovikov, E.S. Omarov, I.M. Piskarev,

V.M. Sorvin, A. I. Gutii, A.M. Parlag

Yad. Fiz. 35, 3 (1982)

Sov. J. Nucl . Phys. 35, 1 (1982)

EL EM. SYM.

Na 23 11 METHOO REF. NO.

82 Is 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,G ABX 7-31 C 7-31 NAI-D 90

The cross section for elastic scattering of photons by the “Na nucleus has been measured in the energy ranges 7-14and 16-31 MeV At energies 16-31 MeV the cross sections for the nuclear Raman effect and for inelastic scattering of photons with population of the 2.03-MeV level are obtained. The results are discussed in the framework of the shell model. The contributions of various shell configurations to the formation of the giant resonance in “Na are evaluated.

PACS numbers: 25.20. + y, 27.30. -+ t

, -j a* 0/W

F Mev

FIG. 2. Differential cross sections for photon- scattering channels in the region of the giant resonance: a elastic

scattering, b— nuclear Raman effect, c— inelastic scattering

with excitation of the 2.0a- MeV level.

TABLE II. Position of maxima in the cross sections for the various photon-scattering channels.

tljslic Mattering. r ~ 3/2*

NR t. 0 44 MeV.

J

9 - 5/2*

inelastic scaiterinei •nth excitation 4 of the 2 08-McV ! level. J

n - 7/2

r

)

Clastic ^cattcrin*. f

9 * 3/2

NRE.

0 44 MeV. r* 52’

i Inelastic scai:c:ire

| Airh excitation

1 of the 2 08-MeV

, level. /»« 7/2'

id ii-u5 ! 7.*2:0.3

1

t S.O= 0.5 j 1\ - 10.:$ 2:0.3 - _ _ 26.5*0.3

1 _ 27. 1=0.5 —

23.7- - 4 :s 0=0.3 - -

PO«M N 3S-418

’P £ V. 7. J 4-44) USCOMM.OC 2«010.p«4

U.S. DEPARTMENTS* COMMERCE

NATIONAL 3UREAUC* STANDARDS PHOTQNUCLEAR DATA SHEET 239
.

240
1 i

I!

I

0

Mg

B

«

i

d

d

«

d

MAGNESIUM

Z=12

Because the metal is so reactive, man's first knowledge of magnesium came

from its compounds. In 1518, Henry Wicker (or Wi ekes) noticed a small

hole filled with water on the common at Epsom, Survey. Even though there

was a draught, not one of his thirsty cattle would drink the water. The

water, altnought bitter, was found to be useful as an internal medicine

and as a bath to heal external wounds. Within 30 years, Epsom became a m

famous spa and attracted visitors from all over the continent. The ^ English botanist Nehemiah Grew (1641-1712) in 16S5 isolated the salts

(magnesium sulphate) from this well and recognized it as a unique

subst ance

Sir Humphry Davy in 1803 produced a small amount of the metal by

electrolyzing magnesium sulphate using metallic mercury as the cathode.

This process yielded magnesium, not in a oure form, but as an amalgam. It was two years later in 1823 that the metal was first actually isolated.

A. Bussy (1794-1882) obtained it by fusing magnesium chloride with

metallic potassium. He called it magnium because as he said, the word

magnesium is easily confused with manganese. Nevertheless, the word

magnesium persisted.

Hg

24

n t r . |

<

1

Q

fl

1

a

a

a

i]

i]

«

a

n

n

a

fl

n

D . Reagan

Phy*. Rev. .100, 113-120 (1955) Mg 12

METHOO

Linac; counted delayed neutrons from N

17

REF. NO.

55 Re 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,N17 ABI THR - 400 C 80-400 ACT

4PI

/

(c)

<d)

Fig. 5. Graphs a, b. and c shoa activation points for X17 yields:.-, magnesium and aluminum. Graph

d, e, and f are the

_ calculate, photon cross sections, irom which the solid lines in a, b. and c have been reconstructed. The thirj cross-section curve i3 actually the slightly modified result of an early aluminum run, and is included to illustrate the effects of moderau

errors in data upon the photos cross section results.

FORM NBS-418

(REV. 7.U.J4) U9COMM.OC asoto-Psa PHOTONUCLEAR DATA SHEET 243

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
PHOTONUCLEAR DATA SHEET 244
Ref. F.F . Yergin

Phys. Rev. 104 , ljljO (1956)

Elem. Sym.

Mg 12

Ref. No. 56 Ye 1

Method Neutron detector; Bremsstrahlung.

EGF

Reaction E or A E S'

dE J * Notes

(Y,xn) 7-23

Mg

2i+ (Y,n) th = 16.57 MeV

Mg25 (Y,nU = 7-53 MeV

'th

26 / Mg °(7,n)

h = 11.12 MeV

Figure 1 : Yield of neutrons versus

gamma- ray energy for natural magnesiu

samples. Points shown with estimated

error ellipses are for the present

work. Crosses are from reference 2

[Katz at al, Canad. J. Phys. 32 , 580

( 195*0 ] } scaled by a factor 0.74- to

give agreement with the present work

at 20 MeV. Triangles are the Mg25

yield data for reference 5 [Phys. Rev

98 , 1296 ( 195*0 ], adjusted for the

isotopic abundance of Mg^5 in natural

Mg. The (7, n) thresholds for the 3

Mg isotopes are indicated along the

abscissa. Over the energy range from

threshold to about 16 MeV the yield

values are plotted to a scale expanded 5 times over the scale given. Fro: about 12.5 MeV to the upper energy

limit of the data, the points are plotted to the scale shown. (The

points from 12.5 to 16 MeV are plotte

to both scales).

L

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS form NBS-418

(8-1-63) USCOMM-DC 18556-P63 PHOTONUCLEAR DATA SHEET 245
Ref- B.M. Spicer, F.R. Allum, J.E. Baglin, H.H. Thies

Australian J. Phys. _U, 273 (1958)

Elem. Sym.

Mg

Ref. No.

12

Method 18 MeV electron synchrotron; BF, counters; 0.25 r Victoreen thimble

ionization chamber; 8cm Lucite monitor. 58 sP 2 EH

Reaction E or AE <7d E J

rr Notes "V3lT‘

Mg (Y,n) 8^17 15.5 a = 2.5 mb max

At E = 17 MeV, absolute yield of

neutrons calculated to be 4x10^ n

-1 -1 m r

Fig. 2. —Cross section for photoneutron production from natural magnesium.

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

form NBS-418

(3-1-S3) USCOMM-OC 18S5S-PS3 PHOTONUCLEAR DATA SHEET 246
REF. M. Langevin and A* Bussiere de Nercy

J. Phys. Radium 20, 831 (1959) (See 61 Bu 4)

ELEM. 5 YM.

Mg 12

METHOD

59 La 1 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,G LFT 10 c 13 NAI-D 0 • 12 135

( 10.3±0. 5)

j cJ g dE = 2.24±0.44 MeV-rab

r = 22±4 eV

Y

form NBS-418

(R EV. 7-« 4-64) USC OMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 247

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANDARDS
REF. T.G. Walker, W.T. Morton

Proc. Phys. Soc. (i 960 ) Mg 12

METHOO

Synchrotron; proton-neutron cross section; radioactivity

REF. NO.60 Wa 2 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE, RANGE TYPE RANGE G,2N3P ABX THR-24G C 24-0 ACT1

4-Pi

.07 2

O = (0.20±0.02) 10 cm /equivalent quantum

form NBS-418

(REV. 7-1 4-84J USCOMM-OC 26010-P64 PH0T0NUCLEAR DATA SHEET 248

U.S. CEFARTMENT OF COMMERCE

NATIONAL 0URSAUOF STANDARDS
R £ r . EL EM. 6 i M. A. Bussiere de Nercy

Ann. Fhys. (Paris) Third Series 6

METHOD

1379 (1961) Mg

REF. NO.

12

61 Bu 4 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G.G ABX 15-30 C 27 t 32 NAT-D 140

to

'ta'woF

( (Ik/ Start

Fi* 19. — Ve.

linn rfdracv

iliffrrrnlirllk

>lc ili<Tii>ioa 1. [' i iV>* pour le inato 1

|

I

tlNrtl

..d k, . i >t JO

form N 3 S-418 'REV. 7-14- 641 USCOMM-OC 26010-P64 PHOTOHUCLEAR DATA SHEET 249

U.S. OEP ARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Ref. M. Sugawara

J. Phys. Soc. Japan J£, 1857 ( 1961)

Elem. Sym.

Mg 12

Ref. No. 6l Su l

Method 25 MeV betatron; photon scattering; Nal(Ti) spectrometer;

ion chamber 0.5 NVB

Reaction E or AE <7d E J n Notes

Mg (7, 7) Bremss.

7-14

10.2

9.3

+1.2

5‘ 8

-o. 6

eV1 0.9eV Detector at 120

2CC-*

i O

*0

;nrr^, n^roer

\

l-'ig. .. .file spectra >#f the scattered photons from

tiie Me -cattc-rer The solid line is the spectra measured without the Mg absorber and t::e broken line with the absorber. They are ill normalized to the unit charge of the ionization chum ber.

big. 4. The yield curve for Mg The count at each bombarding energy of the incident bremstrahlung was normalized to the unit charge from the monitor The vertical lines show tile statistical errors.

FO RM NBS-418

(3-1-63) USCOMM-DC 1 8556-P63 PH0T0NUCLEAR DATA SHEET 250

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
PHOTONUCLEAR DATA SHEET 251
PHOTONUCLEAR DATA SHEET 252
PHOTONUCLEAR DATA SHEET 253
Ref- m M. Sugawara, S. Mori, A. Ono, A. Hotta, M. Kimura

J. Phys. Soc. Japan IQ, 17 ( 1963 )

Elem. Sym.

Mg 12

Method 25 MeV betatron; photon scattering; Nal spectrometer; NBS chamber

Ref. No.63 Su 1 q ^ NVB

Reaction E or A E S

a dE Jit Notes

Mg(7,T)

Bremss.

4-14

10.2 fl4

J ^

= 0.6 MeV-mb Detector at 120

O' = 0 .

5

max

Corrects results of J. Phys. Soc.

Japan 16, 1657 (1961)

( a )

form NBS-418

(8-1-83) USCOMM-OC 185SS-PS3

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANOARCS PHOTONUCLEAR DATA SHEET 254
B. S. Dolbilkin, V. A. Zapevalov, V. I. Korin, L. E. Lazareva and

F. A. Nikolaev

Proc. Paris Conference 1060 (1964)

ELEM. SYM. A

Mg 12

method

Synchrotron

REF. NO. 64 Do 2 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE MU-T G.MU-T 12-30 C 250 MGP-D 12-30 4PI

3 0

ddE = 332 ± 40 MeV.mb

la

Av..., (MeV) 13.9 17.0 18.9 20.3 23.1 24.8

Omu. (mb) 7 16 37 41 30 32

Half-width T (MeV) ~ 0.9 - 0.7 - 1.0 ~ 1.0 l to 1 ®

/o.d(Av) (MeV.mb) 14 20 55 64 95 53

Fig- 1- — Nuclear y-ray absorption cross-section of Mg(.Mg“ — 78.6, Mg* — 10.1, Mg* — 11.3 per cent). The cross sections tor Mg in tne aoove figure nave to be raised by 2.5 mb.

Fig. 2. — Nuclear y-rays ^L/sor^tion cross section of Al*.

FORM NBS-418

I R EV. 7-1 4-«4) USCOMM-OC 2fl010-P«4 PH0T0HUCLEAR DATA SHEET 255

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
B. Forkman and W. Stiefler

Nucl. Phys. _f6, 604-614 (1964) [Page 1 of 2] Mg 12

method

Synchrotron Transmission Chamber

REF. NO.

64 Fo 1 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE OET ECTOR

ANGLE TYPE RANGE TYPE RANGE

G,P SPC THR - 40 c 20-40 EMU-D 1-18 DST

See following theory paper, Nucl. Phys. ^6, 6l5-(l964)

RLX

Table 1 The a coefficient in the angular distribution 1 +a Sin’S of the photoprotons from MgM at the different bremsstrahlung maximum energies

Proton energy (MeV) £L» =* 23 MeV £mU = 26.5 MeV £*« = 40 MeV

1.0—3.5 1.11 ±0.44 0.04±0.05

3.5—5.7 0.18±0.16 -0.1 5 ±0.09

5.7—7.3 -0.29 ±0.23 —0.26±0.14

>7.3 —0.40±0.19 0.99 ±0.42

Fig. 2. Proton spectra for maximum bremsstrahlung energies of 20.5, 23, 26.5 and 40 MeV. form NBS-418

(R EV. 7-1 4-04) U3C OMM-OC 2G010-P64 PHOTONUCLEAR DATA SHEET 256

NATIONAL BUREAU OF STANOAHU3
Fig. 6. Difference proton spectra between the 23 MeV and the 20.5 MeV exposures and the 26.5 Me\

and the 23 MeV exposures for magnesium and carbon. The corresponding photon spectra are alsc given.

Fig. 7. Branching ratios to (a) the §- ground state [21 1 J], (b) the £+ hole state [220 at 2.6 MeV,

(c) the hole state [101 *] at 5 MeV, (d) the hole state [101 |J at 8 MeV in Na» as a function of

the excitation energy of MgM. porm NBS-418

<n EV . 7-1 4-«4) U3COMM-OC 2fl010-P<54 PHOTONUCLEAR DATA SHEET 257

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
C.M

.

J. Go ldemberg, W.C. Barber, F.H. Lewis, Jr.,

Phys. Rev. JJ4, B1022 (1964)

METHOD

Linac

J.W. Walecka

Mg 12

REF. NO. 64 Go 3 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

E,E/ ABX 11 D 40-70 MAG-D 180

FMF

Table I. Data on 3/1 transitions.

1 McV/c Cross section* Reference KJ/I |7, “«(?)| |/i>i J (io-») (1/V) 1(7/1 (!/<)[> Cl0-‘(MeV/e)->] 15.1-McV level in C1 * Photons 15.1 ri o 41 d(S P 8 0.&H (0.19 ±0.025)

Electrons 68 (2.0 ==0.3) this work 0.55 (0.12 =0.01S)

Electrons (160*) 68 (2.6 «) 5 0.69 (0.15 =?.;::= :x

; Electrons 93 (2.0 ±0.3) this work 0.S7 v.0.10 ±0.015)

Electrons 125 (1.5 ±0.25) this work 1.10 (0.07 ±0.012) 3.56-MeV level in Li* Tvtons 3.56 (0.92±n.,»**) b 0.014 (1.10 ±»., 8a - s ‘) ,\:<\*:rons. 76 (3.0 ±0.45) thi» work 2.0 (0.38 ±0.057)

Electrons 106 (1 .55±0.23) this work 2.1 (0.19 ±0.028)

Electrons 136 (0.90±0.14) this work 2.0 (0.11 ±0.017) 11.6-MeV level in Si5* Photons 11.6 (9.8 ±2.6) c 0.016 (1.2 ±0.32)

Electrons 71.5 (3.5 ±1.4) d 0.92 (0.18 ±0.07)

Electrons 88.4 (3.0 ±0.75) this work 1.2 (0.15 ±0.038)

Electrons 129.4 (1.8 ±0.45) tlis work 1.5 (0.09 ±0.022) 11-MeV level in Mga

Photons 11 (13.1 ±3.8) c 0.02 (1.7 =0.50)

Electrons 83 (4.4 =0.88) 6 1.5 (0.22 ±0.044)

Electrons 97 (3.5 ±0.70) this work 1.6 (0.1 =0.034)

Electrons 129 (1.8 ±0.36) this work 1.3 (0.0S1±0.016)

• In units of 10“,T MeV-cm* for photons and 10"** cm*/sr for electrons. • A. B. de N'ercy. Ann. Phys. (Paris) 6. 1379 (I960.

* L. Cohen and R. A. Tobin, N’uci. Phys. 14. 243 (I960). * R. D. Edge and G. A. Peterson. Phys. Rev. 123. 2750 (1962).

form NBS-418

(Rev. 7-1 USCOMM-DC 2G010-P64 PH0T0NUCLEAR DATA SHEET 258

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UPEAUOF STANDARDS
B. S. Ishkhanov, I. M. Kapitonov, V. G. Shevchenko and B. A. Yur'ev

Phys. Letters 162 (1964)

ELEM. SYM.

Mg 12

METHOO

Betatron

REF. NO. 64 Is 1 JOC

REACTION RESULT excitation

ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE

G ,XP ABX THR - 32 C 15-32 SCI- D 0-3 Ut<N

TaJble 2 Measurements results

Element Maximum

cross

section (b)

Peak

position

(MeV)

Peak half- width (MeV)

Integrated cross section |’ 32 caS

0(MeV.b) P 0.043 21 10 0.35 ± 0.06

S 0.050 21 9 0.37 * 0.03 Mg 0.018 0.018

22.5

26.0

11 0.18 ± 0.04

, (m«

10

• ^

0 1

,'f .« 21 2 * " « 31 a HeV

Fig. 2. The (y,p) cross section, for Mg.

form NBS-418

(R EV . 7-1 4- $4) USCOMM-OC 28010-P64 PHOTONUCLEAR DATA SHEET 259

•J.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
B.S. Dolbilkin, V.I. Korin, L.E.

V. A. Zapevalov

Nuclear Phys. 72, 137 (1965)

METHOD

Synchrotron

Lazareva, F.A. Nikolaev and

S.M . i f M. A

Mg 12

REF. NO.

65 Do 2 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,MU-T ABX 11 - 30 C 260 MGP-D 10-30

Fig. 2. The nuclear absorption cross section.

Table I Parameters of resonance peaks observed in the nuclear absorption cross section (MeV) 11.2 13.8 17.1 18.9 20.4 22.9 24.9 27.0 ’U (mb) 21 13 20 37 29 26 20 19

Half-width r (MeV) 1.5 0.3 0.4 0.8 1.3 2.6 0.6 4.9

J

<y(/iv) d (hv) (MeV • mb) 48 7 14 44 57 106 18 146

FORM NBS-418

(REV. 7- I 4-84) USCOMM-OC 28010-P84 PHOTONUCLEAR DATA SHEET 260

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANDARDS
G. Manuzio, G. Ricco and M. Sanzone

II Nuovo Cimento 1057 (1965) Mg 12

METHOD REF. NO.

65 Ma 4 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,XP SPC THR - 31 c 31 SCD-D 3*14

-L 2

Y(E >3.5 MeV) = 10 cm .mole MeV.

P

Table I. - Energy level» in “Mg.

(r. a) (•) (Y. n) (•) Total

absorption (*) Total

absorption {“) Our

experiment

17 17.5 17 17.5

16.3

17.8

19.5

18.8 18.9 19.2 18.9

21.5 20 20.3 20 20

23.5 23 23.1 25.5 25 25.8 —

(a) ref. (’) (c) ref. ( ")

U>) ret. (•) Id) ret. (

A 6001-

Fig. 2. - Photoproton spectrum from Mg.

f o rm NBS-418

(REV. 7-1 4- 64) USCOMM-OC 2«010-P«4 PHOTONUCLEAR DATA SHEET 261

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
K. Min, W. D. Whitehead

Phys. Rev. JJ7, B30L-304 (1965) Mg 12

METHOO

Synchrotron; NBS chamber monitor

REF. NO.

65 Mi 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,XN ABX THR-30 C THR- 30 BF3-1 4PI

Table I. Isotopic abundance in the samples and

threshold energies.

Isotope Abundance

(%)

h,n) (MeV)

Cy,pn) (MeV)

(7,2 n) (MeV) Cu 98.89 18.7 27.4 32.4 C'1 1.11 S.O 20.9 23.7 Mg*4 78.60 16.6 24.1 Mg“ 10.11 7.3 19.0 23.9 Mg** 11.29 11.1 23.2 18.4

Fig. 3. Total photoneutron cross section of magnesium unfolded in 1-MeV intervals.

Table m. Energy levels observed in magnesium (MeV).

Present work

(t,»)

Other experiments

(7,")* Absorption1*

17.0 17.5 17.0

19.5 18.8 19.0 21.5 20.0 20.0

23.5 23.0 23.0

25.5 25.0 25.0

J'-nt. uo

,dE = 90.7 MeV-mb

• Reference 9.

b Reference 23.

form NBS-418

(R EV. 7-1 4-«4> USCOMM-OC 20 010- P® 4 PHOTONUCLEAR DATA SHEET 262

U.S. DEPARTMENT OF COMMERCE

NATIONAL. 9UREAUOF STANDARDS
J.M. Wyckoff, B. Ziegler, H.W. Koch, and R. Uhlig

Phys. Rev. JJ7, B576-94 ( 1965) Mg 12

method

Synchrotron; ion chamber monitor

REF. NO.

65 Wy 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,MU-T ABX 10-70 c 90 SCI- D YfX

41 -tFio. 13. Magnesium total photonuclear cross section. The solid

line in (a) represents the Lebedev data moved up in energy by

375 keV.

Z

M#V- mb

'

1

MAGNESIUM •. * -l

//

9

/**

r

: -j.e

.* i

; A

I

1 L_J i l~

5 20 40 SO ENERGY, utv

Fig. 14. Magnesium total photonuclear cross section integrated over energy. The dot-dashed line represents the corrected baseiine

resulting from the introduction of the calculated radiative correc- tions to the electronic cross sections.

form NBS-418

IR EV . 7- I 4.44! 'JSCOMM-OC 28010- P64 PHOTONUCLEAR DATA SHEET 263

U.S. CEPARTMENTOF commerce

NATIONAL BUREAU OF STANDARDS
REF- B. S. Dolbilkin, V. A. Zapevalov, V. I. Korin, L. and F. A. Nikolaev

Izv. Akad. Nauk fiz. 30, 349 (1966)

Bull. Acad. Sci. USSR-Phys. JO, 354 (1966)

METHOO ~

E. Lazareva ELEM. SYM. a z

Mg

REF. NO.

12

66 Do 2 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G-MU-T ABX 8-30 C 260 MGP-D 6-30 4PI

3j3

Resolution 120 keV 10 MeV

220 keV 20 MeV C. m b

Table 2

3reit-Wigner resonance components of the Mg cross section (Fig. 3)

E res’

M e V

<rmax’

tn b

r.. MeV ^ e v ' m b

i E

; res

; j M ' V

<rmax

mb

P1 •• 1 M e V

|

pdE,

V: c V * m b

11 ,2 21 1.5 48

i

'1

:| 20.4 29

1

1 ,3 1 57

1.1.8 13 0.3 7 22,9 26 2.6 106

17,1 20 0,4 14 24.9 20 0.5 13 18,9 37 I 0,8 44 ii 27,0 19 4.9 | 1

5

form NBS-418

(R £V. 7 • I 4-«4> USCOMM-DC 2A010-P64 PHOTOHUCLEAR DATA SHEET 264

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANOARD3
F. W. K. Firk

Proc. Gatlinburg Conference 352 (1966)

ELEM. SYM. A

Mg 12

method REF. NO. 66 Fi 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,XN SPC THR-65 c 65 TOF-D 5-40 90

Neutron Energy — MeV

50 (0 5 50 10 5 50 \Q s

i ll 1

'

i

1 — 1 ” 1 ~ —-

i 1 r -»—'? — 1 , - ' 1 1 1

1 1 - 1 -i 1 1 1 1

C

Fig. 1. Observed photoneutron time-of-flight spectra, of C, O, Mg, Si, Ca, Co,V, and Ta.

form NBS-418

(REV. 7-

U5COMM.QC 26010-P€4 PHOTONUCLEAR DATA SHEET 265

U.S. (DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF 3TASOAROS
c. r . H. Hoffmann, B. Prowe and H. UlLrich

Nuclear Phys. 85. 631 (1966) Mg 12

METHOD

Betatron

REF. NO.

66 Ho 3 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE G,A SPC THR-31 C 31 SCD-D 2-13 130

Table 1 Experimental data and results

Element Mg A1 S Ni Cu Zn Error (%)

target thickness (mg/cm1

) 0.81 1.54 0.80 2.50 2.68 3.00 5‘)

dose (r) 6190 25400 23200 3880 5840 4220 10

yield absolute (lO^/mole • r) for £m > 3.16 MeV 0.61 0.93 1.46 1.65 0.92 2.42 u»)

yield relative to Ni 0.36 0.56 0.88 1 0.55 1.43 5‘)

V. o 8 9.6 11.4 12.4 7.0 3.2 B

)

nuclear temp, d (MeV) 1.43 1.48 1.46 1.04 0.91 10

level density parameter a (MeV-1 ) 5.1 4.8 4.9 8.6 10.8 10

*) For S, the error of the target thickness has been 10 %, of the absolute yield 14 % and of the relative yield 10 %.

b

) For Zn ny _, ot is not known.

«
J. M. Loiseaux, J. M. Maison, and M. Langevin

J. de Physique _28, 11 (1967)

ELEM. SYM.

Mg 12

METHOD REF. NO.

67 LO 1 JOC

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE

g,g/ ABX 16-32 c 34 NAI-D DST

“O. . o\,'a "Mg

"Si "K

TABLEAU I

Coefficient a des distributions angulaires

IU(0) = 1 - a cos2 0

a( 19-25 MeV) = 1 ± 0,1

ai 15-18 MeV) = 0,1 ± 0,1 a( 18, 5-23 MeV) = 0,4 ± 0,15 a(25-30 MeV) = 0,85

a( 16.5-20 MeV) 1! p II- © a(20-25 MeV) = 0,5 - 0,1 ai 25,5-32 MeV) = 0,5 ail5-17,5 MeV) = 0.87 ± 0,1 a(18-23 Me\') = 0,7 - 0,1 a( 25,5-32 MeV) = 0,5 a(14,5-18,0 MeV) = 0,7) -0,1 a( 19-24.5 MeV) = I - 0.1 a (25-32 MeV) = 1

Mg, No, F

<2

Fir. S. Sections efficaces diiterentieiles de diffusion a 1 10” pour la F (I). »Na (III) et Mr (V). Section efFicace prevue par ia relation de dispersion pour uXa (courbe II) et Mr (courbe IV).

form N8S-418

( R EV. 7-1 4-94) USCOMM-OC 29010-P94 PHOTONUCLEAR DATA SHEET 267

U.S. CEPAPTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
G. A. Savitskii, N. G. Afanas'ev, I. S. Gul'karov, V. M. Khvastunov,

A. A. Khomich, and N. G. Shevchenko

Yad. Fiz. 7, 1181 (1968)

Sov. J. Nucl. Phys, 7, 705 (1968)

Mg 12

METHOD REF. NO. 68 Sa 1 HMG

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E.E/ FMF 1-8 D 100-260 MAG-D

Observed inelastic scattering peaks at

1.4±.2, 4.1±.2, 6.0±.3 , 6.9±.3, 7.6t.3 MeV.

Results compared with the prediction of the a- particle model.

3 PEAKS 1. 4-6.0

FIG. I Form factors for scattering of electrons by the nucleus Mg34

: a - clastic scattcnng form factor; b - form factors corresponding to excitation of the levels 1.37 MeV (2 +

) - 0;6.0 MeV (4'*') — X; and doublet 4.1 MeV ( 2 * and 4*) - A; the curves are calculated ac- cording to the a-particle model.

form NBS-4 18 (Rev. 7-1 A-«4l USCOMM-OC 2S010-P44 PHOTONUCLEAR DATA SHEET 268

U.S. DEPARTMENT OF COMMERCE

NATIONAL- BUREAU OP STANOAROS
G. A. Savj.LSk.ii, N. G. Atanas'ev, I. V. Andreeva, I L. M. Krugovaya, V. M. Khvastunov, A. A. Khoraich, Izv. Akad. Nauk. Fiz. 21 , 53 (1969)

Bull. Acad. Sci. USSR-Phys. 21 , 50 (1969)

METHOD

s N.

. Gu L ' karov

,

G. Shevchenko

Mg

REF. NO.

12

69 Sa 2 hrag

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE EjE/ FMF 1-8 D 99-229 MAG-D 99-229 DST

(1.4-7. 6)

B(EL) 1-8 MEV

Table 2

Squared form factor for inelastic scattering of electrons with

excitation of levels in 24Mg

Q = 1.37 Me V (4,l±0,2) Me V (6.0±0,2) Me V

- (6,9±0,3) Me V (7,6±0,3) Me V

7

a F\. 10-

7^a

to " 9

O' to# Fl 10-

7^a

to • •

O*.# Fl 10-

7^

s

*

• V

O' to# Fl 10-

7

a

to ,

* «

O* *e* Fl 10-

0.804 161+68 0,409 9,8±9,8 0,899 6,5±3,5 0,409 5,2± 1 ,3 0,899 11,1 ±6,6

0,804 1 47 +46 0,809 9 , 4 ± 9 ,

0,902 4,8±3,0 0,509 5,0±1,4 0,902 11,5±3,9

0,002 101 ±32 0,609 4, 0*2,0 0,993 8,5±3,3 0,609 3,1 ±1 ,1 0,993 15,1 ±3,9

0,903 1I4±3'> 0,804 4, 7 + 2,0 1,09 7 ,9±2,3 0,706 2,3±0,8 1,09 19,G±4,7

0,904 131 ±41 0,899 5, 1 ±2,6 1,18 9,6±2,0 0,707 2,2±0,7 1,18 21 ±5

0,003 70, 2 ±24,6 0,902 1 ,8+1,6 1 ,27 8,6±2,3 0,804 1,4±0,4 1,27 15,9±3,7

1,08 64, 2 ±26,

0,993 6,8±2,1 1,36 8,1 ±1 ,6 1,36 15,3±3,4

1 ,09 1 13 + 24 1,09 5,7±2,0 1,44 10,0±1 ,8 1,44 10,5±2,3

1,09 90,0 ± 18,9 1,00 . 5, 9 + 3,0 1,53 8,3± 1 ,4 1,53 12,1+2,7

1,09 137*28 1,18 4,6*1 ,9 1,60 6,3±1 ,3 1,60 7,8±2,0

1,13 60,6-12,7 1,27 7, 7 + 2,

1,67 6 , 3 ± 1 ,5 1,67 6,4±t,7

1 , W 1 82,2*11 .0 1 ,30 4,8±1 ,0 1,70 6,l±l,4 | 1,73 4,8±1,4

1 .23 .'.0,4-13.1 ! 1 ,44 3,3*1,

I

1 .30 27 , 2 ± 8 ,

| 1 .33 l,3*u,0 !

1

1 /•'»

4

i 1 ,60 ; .7

. fl -’7 I

i , t"0 1 , tj i , 5 2 4 , 70 i , 20 x0 , 43

5 ,07 1 2,4G±0,52 1 | |

Table 5 Characteristics of some electron-excited transitions in 24i«g

Mfl th oo Ptrieitera end Method 6 , 0 XJ).

r, « V

~"X =1 4 6,9+0 .1 Me V. r=‘

7,6±fl,.7 M e V, A — 3

1

| 3x. 1 0-* 25 ,8 ±5,4 2,25±0,33 16,7 ±4,8

1

j

1 n(E\, [,), (4,1 ±0,9) -10* 2,8±0,4 (2,4±0,7). 10*

1

i c 15,0±3,2 1,7±0,3 10,3±3,0

j /'lx. lerei 1 1 0,61 ±0,04 1 ,41 ±0,07 0,84±0,04

2

i ferm 1 0,38 ±0,05 1 ,00±0, 14 0,32±0,04

H(EX, / x —- / .), e

t i*rmi iK G

J1 7? , feroi trim

(6,6±0,7). 10* 24 , 6 ± 2 ,

4,76±0, 1

1 ,20±0,12

0 , 7.3 ± 0 , 08 4,05±0,17

(1 , 55 ±0, 12). 10*

6, 6 + 0,

4 , 1 8 ± 0 , 08

[ over

FORM HBS-418

R EV. 7-1 4-64) USCOMM-OC 26010-P64 PH0T0NUCL£AR DATA SHEET 269

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
r*

Fig. 4. Squared fora factor for excitation of 24Mg levels at 4.12 and 4.23 MeV, as

a function of q'. Solid curves - calculated by method 1 for a X a 1 plus X m 4

multi pole mixture and fitted to the experimental points (02 3 0.0112 and

04 s 0.0566). Dashed curves - contributions of the individual multipoles

.

Fig. 5. The same as Fig. 4, but for the 6.0 UeV level. (X 4, ^ 0.258).

Fig. 6. R

^ (Ref. 8) as a function of q' 2 for the 6.0 UeV level in 24Mg. The

straight line is described by the equation a A \

• (1 - B \

q' 2) with X 4,

\\ » 0.61, and B\ a 0.38 fermi 2 .

Fig. 3. Squared fora factor for inelastic scattering of electrons by 24ilg with

excitation of the 1.37 UeV level, as a function of q': 1 - our data; 2 - Helm's

data*. The curve is a least-squares fit to our experimental points, calculated

by method 1 (X a 2, 0 2 3 0.35).

1 >0 a fifeci'

Fig. 7. The same as Fig.

4

but for the 7.6 I.IeV level

(X a 3, 0 3 = 0.167) .

270
ref. S.c. Fultz, R.A. Alvarez, B.L. Berman, M.A. Kelly, D.R. Lasher,

T.W. Phillips, J. McElhinney

Phys. Rev. C£, 149 (1971)

EL EM. SYM.

Mg 12

REF. NO.

71 Fu 2 hmg

reaction RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,XN ABX THR-29 D 10-29 BF3-I 4PI

14 LEVEL FIT H±ir

FIG. 8. Natural magnesium total cross section <H(y,n) + (y , pn) + (y,2a)) showing detailed structure. The solid line

is merely to guide the eye through the data points.

TABLE II. Integrated cross soctlons of magnesium

Isotopes.

Isotope

<Jty,n mhiE

/ *thr(MeV mb)

I erfy, 2a )d£ J*XhT(MeV mb)

24 Mg 50

:s Mg 226 68 Natural 76 magnesium

form NBS-418

i r e v . 7.1 a. i USCOMM-OC 28010-R«. PHOTONUCLEAR DATA SHEET 271

'J.3. (DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS
t.&M. J ' -VI - Tatsuya Saito

Bull. Chem. Soc. Japan 44, 1800 (1971) Mg 12

method REF. NO.

71 Sa 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.P ABX THR-250 G 20-250 ACT -I 4PI

Maximum brcmssirahiung energy (McV)

Fig. 3. The yield curves lor the reactions ^Mply.pj^Na,

aT AI— 2lNa, and ,2 C(},

l n) ll C as a monitor.

2-Mg(r,p) :t Na, Q: I7 Al-*:, Nat

: ,? C(;-.n) l, C

form N3S-418

(REV. 7- I 4- 641 USC O MM- O C 26010-P64 PH0T0NUCLEAR DATA SHEET 272

'J.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STAN0AROS
Z. Berant, R. Moreh and S. Kahane

Phys. Lett. 69&, 281 (1977)

£L£y. -YM. A

Mg 12

RE". NO.

77 Be 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE CETECTG=

r 'P£ ANCLE RANGE TYPE =angE

G,G ABX 5 - 8 D 5-8 SCD-D 140

5. 5-7. 2 MeV

n-.-,- i Table I

c

E C(Z = 6) Mg(Z= 12) IkeV) Experiment Theory Thomson Experiment Theory Thomson

5516

5752

6465 6517

6874

7163

0.17 i 0.04

0.20 r 0.06 0.17 ± 0.04

0.16 e 0.04

0.18 e 0.04

0.16 e 0.04

0.16

0.15

0.15

0.15

0.15 0.14

0.17 0.17

0.17 0.17

0.17

0.17

0.64 t 0.15

0.66 * 0.15 0.64 i 0.15 0.63 ± 0.15 0.59 i 0.15

0.50 i 0.15

0.61

0.61 0.59

0.59

0.58 0.57

0.67

0.67 0.67

0.67

0.67

0.67

5Ca”E=EO 5PEC T£?Um I «0.L ^

"'^4- ,

!

i -j .1 i i -eoL ^^vAL,._ . '.-’S'/r.-

•

2cK-;. ;

3Gc|—

54oL

=5Col—

I -800K

-000 1-

I 32CC1-

NC ZEsr / 3£a

/ - 3. SOURCE

~jy\

t.

2 r^,

^

.

'5ocl- «W; kJ

JU -u --- =30 550 -iC CHANNEL

He. I High-energv part of the eiastie scattering spectrum from

a Mg target at 140 as measured by a 40 cm

3 Gel Li) detector, and ot the incident Vfn. y) spectrum. Lines indicated by P and

F denote photopeaks and first-escape peaks. Other lines denote

double-escape peaks.

us : £

a A 3 ' K* £ N t photonuclear data sheet 273



Ret. R. Nathans, P.F. Yergin

Phys. Rev. 98 , 1296 (1955)

Elem. Sym. A

Mg 24 12

Method counters; 24 MeV Bremms. betatron. Ref. No.55 Na 1 EGF

Reaction E or A E ad E J n Notes

(y.xn) 9.3-

24

19.5 7-8 0.055 MeV-mb E = 16.6 MeV; a = 8.4 mb. th max

No corrections.

[NOTE: Figure 1 - "KBM" - Katz,

Baker, Montalbetti, Can. J. Phys,

IL -50 (1953).]

10 Mq

24

( r.n)

' \

1 \ i i\

Photon Energy (mev)

! ic 1. (-,jr cross section for Mr. The ordinate scale is in miilmarns < 1 *

)

-

- cnr The locations of the thresholds for various

reactions are indicated hy irrous. The crosses are the : mis

calculated from the ield data. The solid curve is drawn to tit the

points. I he dashed curve represents results previously reported

*’>' "thers for Mrl- .« Mir* by the residual activity method

! see reference S).

! Katz, Baker. and ,\ [ontalLetti. ('an. j. Phvs. 31. ’30 (1053,

fo rm N BS-41

(9-1-63) USCCMM-DC 1 3556-F63 PH0T0NUCLEAR DATA SHEET 277

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
_ EM. r M.

R. H. Phys.

METHOD

Helm

Rev. 104, 1466 (1956) Mg 24 12

56 He 3 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E.E/ FMF 1-7 D 187 MAG-D DST

/

F:g. 3. Inelastic angular distributions (observed cross section divided by Fcshback point-charge cross sections). The results of Hahn ct nL. (reference 8) for Ca and of Frcgcau and Hofstadter

(reference 11) arc included for comparison.

Fig. 7. Inelastic “universal curves.” A composite plot of

inelastic data from Mg, Si, S, Ca. and Sr against q. 1*. The various form factors are arbitrarily normalized to minimize the spread of points. The point from sulfur and the point from silicon which seem to deviate from the “universal curve” arc assumed to contain undetected experimental errors. The curves labeled Mg(/i2),

Sr(F2), t'a(7\5), and Sr(/f3) are calculated for electric-' |uadnipolc and-oclupolc transit ions using the “smeared 6-function” transition charge densities of bee. V, and are arbitrarily normalized.

Fie. 6. Comparison of typical experimental and calculated squared inelastic form factors. Hotli the Sr (1.85 Mev) and Mg

(1.37 Mev) arc known to be 2-f- levels. The calculated curves

are for a “smeared 3-function” transition charge density (see Sec. V) with values of /?/ g taken from the elastic results. The

abscissae for the experimental data are scaled by values of R

taken from the elastic results £Table III fat J. Shown for comparison (upper curvet is a squared form factor calculated from a quadrupole transition charge density whose radial dependence is constant for r*CR, zero lor r>R. This would give a poorer fit to the data than the 5-function distribution, indicating that the quadrupole vibrational mode is approximated better by a trans- verse wave in an incompressible nuclear fluid than by some sort

of a comprcssional body wave.

-orm N3S-418 REV. 7-1 4-641 'JSC OMM-QC 260 13-

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS P6 4 PHOTONUCLEAR DATA SHEET 278
N. A. Burgov and Yu. V. Terekhov

J. Nucl. Energy II, 1953, VoL. 7, pp. 247 to 254.

Pergamon Press Ltd., London

Mg 24 12

METHOO REF. NO. 58 Bu 1 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.G LFT 1 D 1 SCI- D 1 4PI

1.38 MeV

F ^ 3.2 x

10' 4 eV.

Lifetime by Doppler recoil method. Used recoil from 2.76 MeV y*

Fig. Mg 24.

I. —The decay scheme of s, Na.

= osm N8S-418

R EV . '-1 4- 64 1 'JSCOMM-OC 2601 0» P6 4 PHOTOHUCLEAR DATA SHEET 279

U.S. DEP^"M£NTOf COMMERCE

NATIONAL 3Lf=EAU OF STANDARDS
A. Bussiere de Nercy

Compt. Rend. 250 . 1252 (i960)

METHOD

(See 61 Bu 4) Mg 24 12

REF. NO.

60 Bu 2 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,G LFT 10.5 C NAI-D DST

x = scattering target thickness

y = absorber thickness

Peak absorption cross section 7 ± 2 barns.

Ground state radiation width 180 ± 50 eV.

Total width 1.7 ± 0.4 keV.

U.S. (DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS form N8S-418

(R EV. 7-1 4-64) USCOMM-DC 26010-P64 PHOTONUCLEAR DATA SHEET 280
ftlll

A. Bussiere de Nercy and M. Langevin

J. Phys. Radium 2_1, 293 (i960)

METHOD

(See 61 Bu 4) Mg 24 12

REF. NO. 60 Bu 3 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,G LFT 10 C 23 NAI-D DST

Includes inelastic to 1st excited state,

i odE — 1.9St0.4 MeV-mb

J r = 110x30 eV

Y

f = 1±.3 keV

form NBS-418

(R EV. 7-1 4-«4) USC OMM-O C 26010-P64 PHOTONUCLEAR DATA SHEET 281

'J.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Ret. J.D. King, W.J. McDonald

Nuclear Phys. 19, 9^ (i960)

Elem. Sym.

Mg 29 12

Method 25 MeV betatron; activation; 2 Nal in coinc. to count annihilation

radiation of 3+ from Mg^9.

Ref. No. 60 Ki 1 JHH

A E ad E 1

tt Notes

(Y,n) Bremss,

16.6-25

17.2±0.2

19.2±0.2

ct(y, n) (19.2 MeV) = 6.7 mb

Lower a(y, n) value [9*6 mb, Katz and

Cameron, Phys. Rev. 89, 1 1

1

5 (

1

9 5

1

)

;

8.9 mb, Nathens and Yergin, Phys.

Rev. 98 , 129c (1955) - our reference

(55 Na l)] attributed to use of Leiss

and Penfold data analysis instead of

photon difference method.

:t:on • r

PQ RM NBS-418

5

- 1 - 63 ) 'JSCCMM-CC 15

U.S. DEPARTMENT OF COMMEFC

NATIONAL BUREAU CP S T A N O A P I PHOTONUCLEAR DATA SHEET 232
zrm

m Ref. F.R. Metzger, C.P. Swann, V.K. Rasmussen

Nuclear Phys. 16, 568 (i960 )

Elem. Sym.

Mg 2k- 12

Method protons from Bartol-ONR generator; (p,p'y), etc. reactions for y

source; ring scatterer; Nal.

Ref. No. 60 Me 1 JHH

Reaction E or AE E

0 r 9

iE J

rt Notes

(y,y) 1.37 k - 2

-k ±1.5X10 2V

2+ Assumed f(0) = 1.25 - 5-75 cos

k- + 5 cos Q, corresponding to 0 2—0

spin sequence.

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

form NBS-418

(8-1-63) USCOMM-DC 18556-P63 PHOTONUCLEAR DATA SHEET 283
Ref- R. A. Tohin

Phys. Rev. 120

,

175 (i960)

Elem. Sym.

Mg 24 12

Ref. No.60 To 1

Method Betatron; Mg absorber and scatterer; Nal

JHH

Reaction E or AH <7d E J

TT Notes

oh

Mg (7,7) Bremss.

13.1 1.80+H!e -1.43

ev

E = 10. 15±0.06 MeV

tn

Detector at 118 .

(a)

I'ig. 4. Thresholds lor the levels in Mg and Si.

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

FORM NBS-418

(8-i-ea) USCOMM-DC 185S8-P83 PHOTONUCLEAR DATA SHEET 284
Ref. H.E. Gove, A.E. Litherland, R. Batchelor

Nuclear Phys. 26, 480 ( 1961 )

Elem. Sym.

Mg

A

24

z

12

Method Tandem accelerator; Nal

Ref. No. 61 Go 1 EH

Reaction E or A E E

0 r

$

<ME J w Notes

Na?5 (p,Y) 2.6-11.4 17.4 r =4.9MeV

P

E = ~ 6 MeV

Po

20.6 =4.9MeV E ~ 9 MeV

Po

Fig. 1. Partial energy level diagrams for C 1J

, Mg24 and Xa23 showing the region of excitation energy

covered (shaded), the positions of the first excited states and the energies at which each nucleus becomes unstable against neutron, proton and alpha particle emission. The approximate position

ofiii' the peak of the giant resonance (GR) is also indicated.

EXCITATION ENERGY IN Mg^lMeV)

15 16 17 18 19 20 21 22 23

Fig. 19. The combined yield of gamma rays leading to the ground and first excited state of Mg24 resulting from proton capture in Xa23 and measured at 90° to the incident beam. The different symbols on the yield curve represent separate runs. The abscissa is marked both in terms of the incident laboratory proton energy and in excitation energy in the compound nucleus Mg1 *-

fo rm N BS-41

<3-i-e3) USCOMM-DC 135S8-P83 PHOTONUCLEAR DATA SHEET 285

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS
Ref. E.C. Booth, K.A. Wright

Nuclear Phys. kj2 ( 1962 )

Elem. Sym.

Mg 2k 12

Ref.' No'."' 62 Bo 6

Method ^ MeV e i ectron Van de Graaff; bremss.; nuclear resonance

scattering, ring scatterer; Nal JHH

Reaction E or AE crd E Note*

oil Mg (7,7)

Bremss,

0 - k

Table 2 Comparison of mean lifetime measurements

Nucleus Energy 0/ Spins £ r,:r W’Q)

r < 1014 sec

This work Other

Li‘ 3.56 7 1‘- 0 * ID 1 0.012 0.00“ -0.0015 u

) “ -0.0013 B“

0.0105-0.001

2.14 81 l l 0.53 0.47 -0.06 •«) Al» 2.21 100 **-}- (1) 1 3.2 -0 3 -> Al” 1.01 100 r-i” J 0.98 1 520 170 -50 u) Si u ITS 02 0- - 2* 5 1 0 63 88 73 5” 2 24 95 0* — 2* 5 l 0.63 26 =S9 16 Mg=* 1.37 73.6 0*-2‘ 3 l 0.63 220 155 — 40 <*>

1.61 25 !*-» t d) l 3.6 2.5 — 06 ”) Cu“

—0.4

0.963 69 J-} i

1 0.92 230 72 -13

90 “) Cu41 0.67 69 }-+ 4 1 l 100 31 — 3 1

The factor g equals (2/-f- l) (2/„— 1)

“ l

.

10) JL C lUa, Phya. Omr. 144 (IM) 1449

11) 8. V«fH. L. Jfante Md BL itek. UXM94I4 ll)MiC«iMM4BaMiTkte, Narkwr Phvaiea 14 (1164) 941

19) W. C. Barber. F. Berthoid. G. Frudo and F. £. Guddan. Phya. Rev. 194 (I960)- 2199

14) F. ft. Xetz*ar. C. P. Swann and V K. Rjumnno. Phya. Bar. 119 (1966) 906

13) F. ft. IfaUfa. C. P Swann and V. K. Rasraneaen. NocJaar Phyaica 16 (I960) 069

If) 9. Ofcr and A. Schwaracmld. Phya. Rev Lett. 3 (1969) 394

17) V. K. Bwnnm. F. R. Meta*er and C. P. Swann. Phya. Rev. 131 (1961) 1349

15) J. 3. Commuifa. A. Schwarsscfnid. A. W. Sonyar and S. T. Ponie. Phya. Rev. 134 (I960) 2119

19) T. Rotten. F. R_ Metzger and C. P. Swann. Nuclear Phyaca 33 (1961) 506

ro rm MBS-418

(«•» *43) J5C OMM-DC I8Q06-P6S PH0T0NUCLEAR DATA SHEET 286

U.S. DEPARTMENT OP COMMERCE

NATIONAL BUREAU OP ATANOAROS
Ref.

, P.W.M. Glaudemans, P.M. Endt

Nuclear Phys. 50 , 30 (1962)

Elem. Sym.

Mg 24

kef. No. 62- GJl 1

12

Method Cockroft-Walton generator; Nal

Reaction E or A E dE J " Notes

(p, 7) 300-750

kev

12.18 E = 511 kev.

Po

&Jo of decays are by this ground state

transition.

E resonances also at 308, 591, 676,

F o 738 and 7^3 kev, but y transitions

s 2.9/o.

Detector at 55 °.

£7=308 keV £*

p =511 keV

y~TTX

3 f cV; ; 2

m

, 2 *0C6_

| 9.36

22 -O VI 3 0 74 9 2 0 3 2.1 2.6 V3 2.5

6. 0 : -

522-

4.23 -

?

r az

. <2-3

<1.0 10.06

y 9.96

2 ’Ne s.S5

6.44

522

4.23

• 6* « *-* 7,*.S 9l09 989 37 9C 73 13 22 4.G C.S ' 3 L.

f

Y- <02

788 *07 ??9 & 38 884 738 008 189 0.80 75 2.2 O.S C4T7 0.4 22 1.0 03 30

JL I I I I—L_ 1

24 Mg

Fig. 4. Decav schemes of the 23 Xaip, ;') 24 ^I? resonances at Ev = 308 and .311 ke\

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS FO SM NBS-41

(8-1-63) USCOMM-OC 1 8556-P63 PHOTONUCLEAR DATA SHEET 287
Ref- F.W. Prosser, Jr., W.P. Unruh, B.H. Phys. Rev. 125. 59^ (1962)

Wildenthal, R.W. Krone

Method [proton source not given]; Nal

Elem. Sym. A

Mg

Ref. No.

'

62 Pr 1

2k- 12

JHH

Reaction

Na25

(p,Y)

E or A E

0.58-1.4J 12.532

12.809

12.819

12.958

TUT “"Trnrr

; “Iff "Tniy

. "tf

i_ u.ii_

iS: : : dci

m L—

XI

OT “W

Fi£^_l: Re and proposi resonances

Na‘~ 5 (p,Y)M^

e d

lr. of the restproposed

et al, Phy

(1956)]; tt. proton bom

are listed

dashed line

tions the are uncerta

resonance

.

lative in

cascade

in the re|,

2k

tensities

s for 12

action

The nances is

ref. 6

Rev. 1 e corres Warding e in Table

s represe

xistence

in at thalt

icfe po

ne

numbering

that

Prosser

, 369

nding

rgies

1. The

nt transi

of which

nances in the N'a°(;,7)Mg“ reaction. The relative intensities 2a

their standard errors, are given parenthetically following the mo gies of the y rays and are in arbitrary units based on 100 for the strongest high-energy y ray in the spectrum The energies of the rays whose presence in the spectra are less certain or which were not fitted into a decay scheme are shown in italics.

Reso- nance

Proton

energy

lkev>

Excitation energy (Mev)

7-ray energy (Mev) and

relative intensity 6 594 12.262 10.89 (56*5) ; 8.03 (100±5);7 04 (32*5); 6.05 (9*2); 4.90 (8*2); 4.23 ,80*4); 3.85 (46*4); 2.86 (31 ±6); 1.37 (144*20)

675 12.338 10.97 (30 *4) ; 8JO (4*2); 8.10 (100*8); 7.35 (13*5); 7.11 (41*7); 6.32 (11*4); 5.98 (15*4); 4.98 19*4); 4.64 (6*3); 4.23 ( 76*4); 3.85 . 40 *4); 2.86 (30* 4); 1.37 (120*4)

740 12.401 11.03 (42*5); 9 2 (20*6); S.8

1 13*4) ; 8.17 1 100*5); 7.62

< 13*61; 7.35 <27±8); 7.18 (64*8): 6.30 (10*4); 5.98 13*5); 5.05 '23*41; 4.78 '13*41; 4.23 (84±oi: 3.85 (48*6i ; 2.86 ,38*6); 1.37 il20*15)

10 744 12.405 8.18 (100±3i; 7.18 <24*4; ; 6.20 i7±5l; 4.75 .8±5>; 4 23 ,78=5': 3.85 (22*4); 2 86 (27*5;; 1.5< ,49*7)

14 S77 12.552 12.53 1 100*3 1 ; 11.16 M~>,

2*1); 8.30 ,39*2); 7 72 5 = > 7 31 ,8±4i;6.30 5*3); 6.IJ0 4*2); 5.00 ,4*2); 4.S0 '7*31- 4.23 (31*4); 3.85 (11=3, ,9*3); 1.37 i44*8)

16 ‘>80 12.640 11.27 (13*3); 9.4 ,5*2); 8.52

, 100*4); 7.45 (7*2); 6.60 (13*)

4.62 1 12*2); 4.23 (8*2); 3.85 (10*2); 2.75 ,84*4); 1.57 110*10)

19 1022 12.671 11 30 ( 24*3); 8.44 (100* 4); 7 45 30*4); 6.35 ,6*2); 4.94 (14=3

4.25 ,85*5); 3.85 ( 29 *4); 2.36 25*3) ; 1.37 ,94*10)

23 1166 12.809 12.81 (100*10); 11 44 ,37*7)

2+ 1176 12.819 12.32 (100*10); 11.44 ,21=4); U

(12*4); 8.58 (66*5); 7.75 (13*6.; 7.60 (13*6); 6.40 (37*7). 5.05 (38*7); 4.23 (70*20); 3 85 (12*5); 2.86 ,25*8); 1.37 94=15

30 1321 12.958 12.96 (16*3); 11.59 , 100*4': 157 (93*5)

34 1398 13.033 11.66 (14*2); 8.80 (55*4,. 7 0

100*8); 7.6 ,6*3); 6.27 11 =

'

5.40 (19*4); 4.23 (42*5,. 3.86 099*8) ; 2. 86(27 *5) , 1.37 loO=,''

13.05.5 11.08 <7±2); 10.

1

'4*21. S."-'

, 100 =3 ); +.60 'Till; 4.23 f1

1.35 3*1 <; 2.75 ,100*3': 112=1;

This resonance assigned energies

keV to 87’ studies,

target de

taminated

find that

1.4±0.4 k resonance

has been

from 869

various

thin

keV in

Using a iberately con- with Fl9, we

the resonance is

above the strong

in Fl9(p J a

rY)Ol6

Notes

14

23

24

30

Identification numbers assigned

to y transitions to ground

state m Mg

Data for these and other transitions

are in Table II.

Detector at 55°.

TraLS II. Absolute yields of the reaction N

Taa

(£,7)Mg“. The

•hick target yields are those for an evaporated target of N'a-SO,.

rhe assumptions 'ased in the calculation of (2J + l ir, are" diseased in the text.

Thick-target yield

Resonance ( 7

’ 5 /proton X 1011

) uy

(ev) (2/+i)rT (ev)

6 5.4 0.21 1.9

7 16.6 0.70 5.6

9 3.7 0.16 1.3

10 4.6 0.20 1.6 u 12.1 0.58 5.1

16 3.9 0.29 2.4

19 45.2 2.3 20

23 5.3 0.28 4.4*

24 28.4 1.5 17

.10 146 7.9 63

34 34.7 1.9 22 A 92.5 5.1 81*

~

I assumed to be 0.5T. reaction.

FORM NBS-418

(3-1-S3) USCOMM-OC 1 3558-P63

u.s. department of commerce

NATIONAL BUREAU OF STANDARDS

PHOTONUCLEAR DATA SHEET 288
U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS FORM NBS-418

(0-1-0 31 USCOMM-OC T83SG-P63 PHOTONUCLEAR DATA SHEET 289
Ref. H. E. Gove

Nuclear Phys. 49, 279 (1963)

Elem. Sym.

Mg

Ref. No. 63 Go 3

24 12

Method Tandem accelerator; Y-ray yield, spectra; Nal

JHH

Reaction AE ad E J * Notes S 4?-

Na25

(p,Y) 3.8-11.6 15-23

GIANT OIPOLE RESONANCE IN Mg

77*4 /c»0.C8

CF EXCITED STATE

111

ii :

( _L 26 29 30

No ( D,/0

) Mg

EXCITATION ENERGY IN Mq *

- MeV

Detector at 90 .

EXaTATWr ENERGY m IMV

n*. L Tb» yiefd of g 1 o{ fnm d» tmcuon N«-(p,

iiir«y. I!.**.

Fig. 5 hall'

1

. „ x . ,, , „

F*4. A comparison between 1 he experimental results for the Naa

(p v,)Mg:* reaction yield (lower

. A comparison between the experimental results tor the Na-3 (p. reaction yield (lower »«d ihe nredirtw*** ih» v, , '

• , Q , 7 " ~

. . . V . c . . ___i| MUI aaa tne predictions ol the Nusson model (upper half). Note I. Orbit 7. 8 and 6 are “valenc*" and (he predictions 01 Ni sson. Sawickt and Glendennmg (upper nalt ». where (he tcrrell- •**»,*• » orh.i« \ a - . , K . ..

. .. . . . a a < 10 . •rows, _ orous i. 8 and 4 are core orbits. 3. 4 MeV pairing energy has been added to th« V isscher exchange mixture correlations arc included. See ret. "M. . . 67 tm

1(% „ ^

* — Nilsson scale.

10) S. G. Nilsson. J. Sawicki and N K. Glendennmg. Nuclear Physics 33 (1962) 239 . form NBS-418

(8-1-83) USCOMM-OC 10558-

U.3. department of commerce

NATIONAL BUREAU OF STANDARDS PH0T0NUCLEAR DATA SHEET 290
Elem. Sym.

Mg 2k 12

Ref. No. 63 Sh 3 JHH

Ref- N.K. Sherman

Phys. Letters k} 138 ( I963

)

Method emulsions

Reaction E or AE dE J ”

2k / 12*k

Mg (7, C ) Bremss.

TO

Notes

Of 15 6-a events, at least two are consistent with Mg2^(Y,cl2*)cl2*.

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS form NBS-418

18 - 1 - 83 ) uscomm-oc t8sse-p«3

PHOTONUCLEAR DATA SHEET 291
Ref. N.Yamamuro

J.Phys.Soc. Japan 18. 11 (1963)

Elem. Sym.

Mg 24 12

Methodsynchrotron; foils; emulsions

Ref. No. 63Yal 06-

Reaccion H or 4E

S"

dE J * Notes

(t,p) bremss.

Epmax

21.5

Fig. 1. Energy spectrum of photoprotons from

Mg. (I) The solid line shows present and the dotted line is Toms and Stephens’ result.

i I I

<- i. Energy soectrum of oOotoorotoae from M* n i Hiwogrwa i» mow m width of 10OK«V

and aofid line '.hrou<!» hurt circle* iac«« ’he wnorxhed soectrum avenged over the energy regjluuoooi detection. The raJcuuien diarrioutioo of the evaporative -cottas ,» mown by in*

(4.1x10 protons/

mole/roentgen;

see Table I)

Energy distributions of p's

(Figs. 1, 2, 4)

Angular distributions fitted to

a + bsin2

0 (Table III, Fig. 3)

* —— - j —— — *• v/ » m/. » ci ucal lines represent the statistical error. The

Yield ol Na“ (j>, r*+rO la taken from Corn «t al.' s result, which is measured at 90* to the incident beam.

5.8>£'p>3

E p > 5.8

0.24±0.04

0.09±0.02

1.33 0.15

form HBS-418

(a-i- 03 ) USCOMM-OC 1 8556-P63

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 292
REF. E. C. Nucl .

METHOD

Booth, B. Chasan and K. A. Wright

Phys. 57, 403-420 (1964)

EL EM. SYM. A Z

Mg

REF. NO.

24 12

64 Bo 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANOC TYPE RANGE

G ,G LFT 1-3 C 1-3 NAI-D 100

ABI

Table I ( jscs of observed resonance fluorescence

Nucleus

multipol.

Slate (MeV)

Spin r

T(i/irru

J

1 O' 1

, . (sec).

Mean lifetime T BCW

(sec)

Mean lifetime T

other

(sec)

Ref. rjr„

BCW

Mg2 * 0.00 0* E2 1.37 2* 1 4.1 ± 1.3 x 10_“ 13i4x 10-“ 16IJ x 10-“ “) 50 Mg14 0.00 0*" E2 m

) 1.83 l-r

1 12±5.xl0-“ 37±15x 10- 14 70±30x 10-“ “) 22

roiiu NSS-418

(REV. 7. I 4.441 USCOMM-NBS-OC PHOTONUCLEAR OATA SHEET 293

U.S. DEPARTMENT Of COMMERCE

NATIONAL BUREAU OF 3TANOARDS
form NBS-418

(REV. 7-1 A-«4) USCOMM-OC 2S010-P«4 PHOTONUCLEAR DATA SHEET 294

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
N. K. Sherman

Proc. Paris Conference 1051 (1964) Mg 24 12

METHOD

100 MeV Linac; 24Mg(Y, l2

B)

l2

N

REF. NO.

64 Sh 6 JDM

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G.F ABY THR- 100 C 100 ACT-1 4PI

Y > 50 MeVFio. 1. — Complages observes pendant des intervalles de 7 ms centres & des temps T

snivant l’impulsion de synchronisation de i’acc61£rateur.

form NBS-418

IR ev. 7-1 4-641 U3C OMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 295

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANDARDS
H. Artus, P. Brix, H. G. Clerc, F. Eigenbrod, A.

F. Gudden, E. Spamer, P. Strehl, M. Stroetzel,

and K. J. Wetzel

Proc. Gatlinburg Conference, 314 (1966)

method

Go ldmann

0. Titze

ELEM. SYM.

?

A

Mg

REF. NO.

Z

24 12

66 Ar 2 hrag

REACTION RESULT excitation

ENERGY

SOURCE DETECTOR ANGLE TYPE RANGE TYPE RANGE

E,E/ LFT 9-22 D 52 MAG-D 141

qa 5

Fig. 1. Electron scattering from an isotopically enriched “Mg target in the

giant resonance region. Note the suppressed zero of the ordinate scale. The

elastic peak has 9.10* units of the ordinate scale.

TABLE 1 Summary of Experimental Results* Nuclide E.(MeV) Type rT°(eV) 4°/rw R„ ( F) •Li 2.18 E2 (3.9 ±0.5) x 10

-* 14.4 3.77 ± 0.48

3.56 Ml 8.9 ± 0.4 9.4 2.96 ± 0.11

• 7 Li 11.28 ± 0.05 (Ml) or (1.3 ± 0.4)/

g° 0.043/g •

(M2) (0.026 ± 0.008) /g 2 . 6 /

g

•Be 15.97 ± 0.03 Ml (3.7 ± 0.. 8) ,/g 0.043/g —

“B 4.46 E 2 and 0.0173 ± 0.0021 3.2 3.44 ± 0.50 Ml 0.64 ± 0.08 0.34 2.60 ± 0.35

5.04 Ml 1.84 1 0.14 0.69 2.60 ± 0.11 12 C 4. 43 E2 0.0122 ± 0.0008 5.30 3.14 ± 0.30 lsO 6.92 E2 0.100 ± 0.015 3.28 3.82 ± 0.46

11.52 E2 0.52 ± 0.13 1.31 “Mg 9.85 ± 0.04

4MI 7.95 ± 1.2 0.38 3.50 ± 0.49 9.97 ± 0.03

10.35 ± 0.03 E2 0.24 ± 0.05 0.58 5.05 ± 0.50

10.70 ± 0.03 Ml 22.2 ±2.4 0.86 3.60 ± 0.36

10.93 ± 0.04 E2 0.26 ±0.11 0.50 “Si 4.9*7 ± 0.02 CO (2.0 ± 0.5) x 10* 5

° 6.90 ± 1.20 *°Ca 6.89 ± 0.05 E2 0.29 ± 0.04 2.85 4.60 ± 0.50 ‘The Born approximation has been used except for l *0 and *°Ca. “g= (21, * 1)/(2I, i- 1).

' T. 1 equivalent to ME = (8.87 ± 1.00) F

2

.

form NBS-418

(REV. 7-1 4- 64) U3C OMM-OC 26 0 1 0* P64 PH0T0HUCLEAR DATA SHEET 296

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS
aj

m

m

*

m

m

v.

H

m

ft

REF- B. S. Ishkhanov j I. M. Kapitonov, V. G. Shevchenko and B. A. Izv. Akad. Nauk Fiz. 30, 378 (1966)

Bull. Acad. Sci. USSR-Phys. JO, 383 (1966)

METHOD

Yur 1 ev ELEM. SYM.

Mg 24 12

66 is l EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,P ABX thr-34 C 15-30 EMU-D 2-14 DST

too,

i

i

/fj

n i 11 \ no ns),

»rb. ——————————— £, r- b . unit:, 1 U unit*

00 SO SO rJO :50’9 OJ SO SO '20 'SO‘(J

1 J - ? jY. M e V Fig.l. Energy distribution of photoprcuons from magnesium irradiated

w: ... = 23 ?u3 V bremsstrahlung.

Fig. 3. Angular distributions of photoprotons frcm magnesium irradiated with

Eyrnax = 23 MeV bremsstrahlung . The

different curves are for photoprotons

with energies in the following ranges

(in MeV) : a) 3. 8-4. 5, b) 4. 6-5. 5, c)

5. 6-6. 6, d) 0& 6.7, e) ^ 1.9.

/

- - l

is:

too

so

L

' Lf^

2 J b 5

1 n ir

«' 7 d 3 10 !t u So, M \ Fig. 2. I orotons

-7max -

nergy distribution of photofrom magnesium irradiated with

34 MeV bremsstrahlung.

ziy.Pi. ">b

C. ! u r a ., uni ta

•

•

*

• a

•

•

• •

i

i .

!

1 i;:

il ,

b

ii ii i

. n

- c

1

!

i - ^ - a i -7 - .v 2s oorr. m«v Fig. 4. Pkotoproton production

cross sections of magnesium:

a - the present measurements ; b - calculated cross sections

of F.ef. 3; c - calculated

cross sections of Ref. 2.

form NBS-418

(R EV. 7-1 4-64> USCOMM-OC 2S010-P64 PHOTONUCLEAR DATA SHEET 297

U.S. DEPARTMENTOF COMMERCE

NATIONAL- BUR EAU OF STANDARDS
REF. J. Miller, C. Schuhl, G. Tarnas, C. Tzara

J. de Physique 27, 8 (1966)

EL EM. SYM.

Mg 24 12

METHOD REF. NO. 66 Mi 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,N ABX 16-27 D 16-27 BF3-I 4PI

33-4

TABLEAU V

Y, n

Tint £ 26 MeV en MeV.mb

^0 «Ca Mg

41,5 ± 4 73 ± 7 29,4 ±3 5S ~±

6

^IC- 5" ®(Yt n ) dans 24 Mg. Points cxperimentaux de mai 19o3. La courbe tient compte de ia largeur finie de la raie de photons (400 keV)

form HBS-418

(REV. 7.14-WI USCOMM.OC 2C010-P64 PHOTONUCLEAR DATA SHEET 298

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANOAROS
REF - 0. Titze and E. Spamer

Z. Naturforschg. 21a . 1504 (1966)

EUEM. SYM.

Mg 24 12

METHOD

66 Ti l egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

e,e/ LFT 7-15 D 51 MAG-D 56-51 DST

Angular distribution measured for q = 0.48, 0.41, 0.32 fm DST CONST 0

Excitation Energy (MeV)

*pectrum of ‘^elastically scattered electrons from »Mg. The effective target thickness was 50 mg/cm:

. The arrows inli,c mcasured excitation energies in MeV. The type of transition [electric (E) or magnetic (M)J is labeled. .Note the suppressed zero of the ordinate scale. The elastic peak has a height of 2.4 x 104 units of the ordinate scale

Ex (MeV) (eV) TV/Av Rir (fm)

9.85 ±0.04 1 9.97 ±0.03 / iVU 7.95 ±1.2 0.38 3.50 ± 0.49 j 10.35 ±0.03 E2 0.24 ±0.05 0.58 5.05 ±0.50 ! 10.70 ±0.03 Ml 22.2 ±2.4 0.36 3.60 ±0.36 | 10.93 ±0.04 E2 0.26±0.11 * 0.50 -

• Calculated with /?„ from 10.3S MuV intuition. Table 1. Results for t4 Mg. The first two columns give excitation energies and multipolarities as determined from this work. Column 3 to 5 show the ground state radiation widths

fj,0

, the transition strengths in ‘Veisskopp units fw and the

transiton radii Rtr • The 3obx approximation has been used.

[over]

form NBS-418

(R EV. 7-1 4-«4) USCOMM.OC 2S0I0-PS4

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 299
Mg26

E 0

= 51,2 MeV

0 =153 9

- Counts "7c"“

12

A

7.39 £

- 11

10

r 9

r 7

15 14 13 12 11 10 Excitation Energy (MeV)

Fig. 2. Spectrum of ineiastically scattered electrons from “Mg. The effective target thickness was 170 mg/cm:

. The art, .«.* in- dicate the measured excitation energies in MeV. The type of transition, [electric (E) or magnetic (M) ] is labeled. N..:.- rt*. suppressed zero of the ordinate scale. The elastic peak has a height of 2.5 x 10 1 units of the ordinate scale.

300
H. W. Kuehne, P. Axel, and D. C. Sutton

Phys. Rev. 1278 (1967)

ELEM. SYM.

Mg 24 12

METHOD REF. NO,

67 Ku 2 HMG

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,G LFT 9-11 D 9-11 NAI-D 9-11 135

Photons, defined in energy to about 1% with the aid of a bremsstrahlung monochromator, were scattered by isolated energy levels in C, Mg, and Si. Parameters for the six observed levels are

Isotope Energy

(MeV)

iv/r

(eV) r,/r B(Ml)/(«A/2i/»*

C>» 15.11 36 1 0.93 Mg* 10.66±0.02 14 0.8 1.21 Si» 11.42±0.02 23 1 1.33 Si“ 12.33±0.03 Mg* 9.92 ±0.03 3.0 0.5 0.49 Mg“ 10.07 ±0.05 4.2 >0.36

The 15.11-MeV level in C’\ the 9.92- and 10.66-MeV levels in Mg*, and the 11.42-MeV level in Si“ are r=l, r, = 0 analogs of low-lying 1+ states in the neighboring odd-odd nuclei. These levels exhaust most of

of the magnetic dipole transition strength of the respective nuclei, and therefore give information about the expectation value of I s in the ground state.

F o rm NBS-418

(R EV. 7-1 4- 041 USCOMM-OC 2S010-PS4 PHOTOHUCLEAR DATA SHEET 301

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
ref- J. R. Leslie and I. G. Main

Nuovo Cimento 50B . 389 (1967)

METHOD

EL EM. SYM.

Mg 24 12

REF. NO. 67 Le 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

P,G ABX 16-25 D 5-14 MGP-D 8-25 90

943

Ki?. 2. - n) The !I0° yield for the reaction ’•Nnfp, Y,)"Mg as «. function of excitation energy In "Mg. The ordlnnto unit Is uh/nr.

h) As a) for the reaction "N'ftlp, y,). r) The

ratio of these two yields, d) Tho results of one of the calculations by N'ilhhox ,< al.C), using a Kcrrcll-Visachcr interaction and considering ground-state correlations.

JC = 1, K - 0.

I

FORM NBS-418

(REV. 7-1 4- 64) USC OMM-OC 2S010-PS4 PH0T0NUCLEAR DATA SHEET 302

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUR EAU OF STANDARDS
0. Titze, E. Spamer and A. GoLdmann

Phys. Letters 2^3, l 69 (1967)

ELEM. SYM.

Mg 24 12

METHOD REF. NO. 67 Ti 1 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE E,E/ SPC 15-26 D 45-54 MAG-D DST

Spectrometer resolution 145*180 keV,

16 18 20 22 24 26 20 30 E

y

[m«v],

Fig.l. Giant resonance of 24j,tg. The upper part gives the photonuciear cross section for natural magnesium [2], the lower the photoneutron cross section of 24j,ig [ 3 ], The center shows a spectrum of ineiastically scattered electrons. Note the suppressed zero of the ordinate scale. The effective target thickness was 86 mg/cm2. The height of the elastic peak is 8 x 102 units of the ordinate scale. Ey are excitation energy and photon energy, respectively.

form N3S-418

(R EV. 7-1 4-64) USCOMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 303

u.s. departmentof commerce

NATIONAL BUREAU OF STANDARDS
1

1

n

1 • -
R5.F. R. C. Bearse, L. Meyer-Schutzmeister and R. £. SegeL

Nucl. Phys. A116 . 682 (1968)

ELEM. SVM. A

Mg 24 12

METHOD

[Page 1 of 3 68 Be 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE P.G ABX 16-24 D 4- 1-3 NAI-D 16-24 DST

•

24 » Mg {MeV)

Fig. 2. Yield curve at 90° of the ground-state gamma ray from the uNa(p, y) reaction.

2*» Mg (MeV)

20 22 24

i ; n

I

Ep ( Me V

)

Fig. 3. Yield curve at 90* of the gamma ray to the 1.37 MeV first excited state in MMg from the “Na

(p, y) reaction.

l_over

form NBS-418

!R E V . 7-1 A-S4) USCOMM-OC 29010-P94 PHOTONUCLEAR DATA SHEET 304

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Page 2 of 3

24* Mg (MeV)

Fig. 4. Yield curve at 90° of the (unresolved) gamma rays feeding the doublet at 4.12 and 4.23 MeV

in “Mg from the “Na(j>, y) reaction.
R. C. Bearse, L. Meyer- Schutzmeister and R. E. Segel

Nucl . Phys. A116 . 682 (1968)

METHOD

Fig. 10. Coefficients obtained in fitting series of Legendre polynomials to the angular distributions

for “Na(p,>',)MMg. The data were taken with 100 keV resolution.

ELEM. SYM. A

Mg 24 12

[Page 3 of 3

REF. NO.

68 Be 3 egf

DETECTOR

ANGLE

rig. 11. Coefficients obtained in fitting sene* of Legendre polynomials to the angular distributions for "Nafp.y^M^Mg. Tb« datm were taken with 100 keV resolution. a

m

6i

*

PHQTONUCLEAR DATA SHEET 306

U.S. OEPARTMENTO? commerce

NATIONAL BUREAU OF STANDARDS
REF. B. C. Cook, D. W. Anderson, T. J. Englert

Phys. Letters 26B, 341 (1968)

METHOD

ELEM. SYM.

Mg 24 12

REF. NO. 68 Co 1 HMG

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,N RLX THR- 65 C 13-65 ACT1

4PI

• STRUCTURE CERTAIN

O STRUCTURE PROBABLE

O STRUCTURE STATISTICALLY UNCERTAIN

: 8AOAO FEATURES ONLY

'6 24 32 MASS NUMBER A 40

Fig. 2. A dependence of structure. A qualitative esti- mate for the statistical validity for structure is also

indicated. The solid straight lines have the form mA +

8 Me / while the dashed line represents the position

of the Is level as determined from (e.e'p) experiments.

form NBS-418

(REV. 7- I A- 04

1

U3C OMM.DC 280I0-PB4

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS PHOTONUCLEAR DATA SHEET 307
REr ' L. W. Fagg, W. L. Bendelj R. A, Tobin and H. F. Kaiser

Phys. Rev. J/71, 1250 (1963)

ELEM. SYM.

Mg 24 12

METHOD

FOR REANALYSIS OF THIS DATA SEE; 70 Fa 1

REF. NO. 68 Fa 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE E,E/ LFT 7-28 D 39,56 MAG-D 28-56 180

Tahle I. Values of transition widths and radii. DETAILS 9.9: 10.7

Transition parameter Energy (MeV)

Present work

Titze and Spamer* Kuehne

el ai* r(cV) R94±0.03 11.9=2.7 7.95 = 1.2 5. 6=3.0*

10.70=0.03 18.9=3.7 22.2 ±2.4 17.0=4.0 *(!> 9.94=0.03

10.70=0.03

3. 5=0.2

3.0=0.2 3.50=0.49

3.60=0.36

• Reference 6.

b Reference 5.

* krror not given by authors; it is estimated here from information given m Ref. 5.

1278

i(1967j^Uehne’ R' and C Sutton- phys. Rev. 163,

’ 0. Titze and E. Spamer, Z. Nattirforsch. 21a, 1504 (1966) ('067) R°Sen ’ R‘ RaPhael - and H- 0berail, Phys. Rev. 163, 927

FlC. 1. Differential cross section for 180° electron scattering from ”Mg at /i« = 55.9 MeV covering the excitation energy range from about 7 to 28 MeV.

180* ELECTRON SCATTERING BY z *Mg

E 0

* 38.8 MeV

EXCITATION ( M.v I

16

2 He. 2. Differential ctoas section for 180° electron scattering from !, .\lg at /•o^3S.8 MeV covering the excitation energy range from 8 to 14 MeV.

form NBS-4I8

(R EV. 7-1 4- 64) USCOMM-OC ZOO t 0- P6 4 PHOTONUCLEAR DATA SHEET 308

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. G. J. Highland and T. T. Thwaites

Nucl. Phys. A 109 . 163 (1968)

ELEM. SYM. A

Mg

METHOD REF. NO.

24

z

12

68 Hi 1 EGF

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

A,G RLX 11-14 D 3-6 NAI-D 7-16 DST

Table 1 J-PI. G- WIDTH

Resonances in 50Ne(a, y)'*Mg reaction Ex (MeV) (MeV) *) Xo Xi Xi +Xa ( 2j-f1

)rxryir

(eV)

3.056 11.863 1- i 0.7 2.4 c

) 3.187 11.972 2* 0.3 1 0.7')

3.245 12.020 <0.3 1 2.0 3.289 12.057 <0.05 <0.2 1 g33 d

) 3.422 12.168 (29 4

+

) <0.3 1 0.9 5.8 3.715 12.412 <0.2 <0.2 1(X») 20

3.792 12.476 2* 0.4 1 2.3 3.836 12.513 (2\ 4*) <0.3 1 0.3 7.3 3.920 12.583 2

+ 1 0.1 0.1 0.9 3.997 12.647 <0.03 <0.2 1 12 4.109 12.740 2+ 0.7 1 0.2 0.7 4.193 12.810 2

+ 1 0.4 1.8 4.483 13.052 <0.04 <0.1 1 25

4.528 13.089 2* 1 0.07 0.7 2.0 4.913 13.410 (1-. 2

+

) 0.09 1 2.9 (4.944) b

) (13.436) 5.653 14.026 1- 0.6 1 12 5.720 14.082 <0.07 <0.3 1(X.) 9.8 5.743 ») 14.101 5.796 14.146 <0.07 <0.2 HXs) 12 6.017 14.330 2

+

, 3-, 4

+ <0.07 0.36 1(X.) 10

all ±5 keV all ±50%

*) Calculated using Q = 9.317 MeV, ref. “).

°) Energy uncertainty ±10keV.

') Ref. 1 *). d

) See subsect. 3.3.

Table 2 Angular distribution coefficients E, Transition 4,

(MeV)

3.245 Xi +0.07 ±0.10 +0.03 ±0.1

3

3.422 Xt +0.47±0. 14 —0.30±0.18

3.715 Xi +0.47 ±0.04 —0.04±0.06

3.836 'A +0.49 ±0.04 —0.42±0.06

3.920 Xo +0.42 ±0.30 1K* okA II o

4.109 Xi +0.56±0.22 -0.42 ±0.28

4.913 Xi +0.31 ±0.13 -0.11-0.17

5.653 Xo -0.99 ±0.1

3

5.720 Xi +0.38±0.09 —0. 17 ±0.1

1

form NBS-418

IR EV. 7-t 4- 64) USCOMM.DC Z8010-P84

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 309
REF. Y. Oka, T. Kato and A. Yamadera

Bull. Chem. Soc. Japan ^1, 1606 (1968)

EL EM. SYM. A

Mg 24 12

METHOD REF. NO. 68 Ok 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,N ABY THR- 20 C 20 ACT

4PI

ISOMERIC YIELD

m

m

L

K

«

«

f]

*3

»]

S;]

ft

Table 1. The particulars op the (^,n) reaction products and the data obtained with 20 McV bremsstrahlukg

Nuclide

Half-life of product

(sec)

Gamma-ray determined

Limit of

detection

(pg)

Yield (mol -1 R-‘)

Parent

(Natural abundance, %)

Residual Energy (MeV)

Branching

ratio (%)

Photopeak

activity (cpm/mg)»>

I4 Mg(78.60) :s Mg 9.9 0.511 200 2.04 x 10* 0.49 8.1 x 10‘

7*Ge(7.67) 75m Ge 48 0.139 100 6.37 x 10* 1.6 1 . 1 x 104

7*Se(23 . 52) 77m Se 17 0. 162 100 1.82x10* 0.55 1.2x 10* MMo(15.86) ,lm Mo 65 0.650 57 2.22X 10* 4.5 2.7x 10*

140Ce(88.48) ia»mCe 58 0.745 100 1 .06x 10* 0.95 1.3x 10*

l,2 Nd(27 . 13) 141 m Nd 64 0.760 100 3.19x10* 3.1 1.4X10*

l *»Tb(100) IssmTb u 0.111 100 2.5ox 10* 3.8 2.2x 10*

a ) The value corrected at the end of one-minute irradiation with the dose rate of

IQ7 R/min; Counting geometry is 20% with a 3"dia. x3"NaI(Tl) detector.

form NBS-418

(R EV. 7-1 4-64) •JSCOMM-OC 26010-P64

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 310
D. W. Anderson, B. C. Cook and T. J. Nucl. Phys. A127 . 474 (1969)

METHOD

Englert ELEM. SYM. A

Mg

REF. NO.

24

z

12

69 An 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

angle TYPE RANGE TYPE RANGE

G,XN ABX THR-65 C 16-64 ACTI

4PI

3Gl»

MEAS TOT ACT

Fig. 2. The least structure cross-section solution for aa 4-0.6 cr,„. The coefficient for <7,„ results because

the experimental timing cycle used was less efficient for accumulating yield data for ,l Mg(rj = 3.9 sec) than for uMg(rj = 11.2 sec). A likelihood estimate for the statistical significance of peaks is also shown. Peaks with likelihood of 0.9 are considered significant. The vertical lines represent Fy of the strongest transitions of a calculation by Bassichis and Scheck “). W.H.Bassichis and F. Scheck, Phys. Lett. (1965)509.

Fig. 3. The integrated cross section E(£) = J^(<Xa-r0.6 <7ta)d£ shown as a function of energy. form NBS-418

(R EV. 7-14- 04) use omm.oc 2eoio-p«4

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROS PHOTONUCLEAR DATA SHEET 311
n

REF. Otto litze

Z. Physik 220, 66 (1969)

METHOD

ELEM. SYM.

Mg 24

REF. NO. 69 Ti 1

12

egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE E,E/ FMF 1-12 D 37-51 MAG-D 26-51 DST

TABULAR DATA

ft

ft

:

Tabelle 2. Zusammenstellung der Ergebnisse. Spalten 1—6 zeigen die Ergebnisse dieser Arbeit, SpaUen 7—9 enthalten Vergltichswtne andertr Autoren. Hier tied die Werte Ex, I* Ref. 1 entnommen (ME: Matrlxelementfur £0, BA : ausgewertet in Bornscher Ndherung out o', C*

E, /* H Ar G Veraieicfaswene [MeV] [fa22

] UV1 [CV J tfoa* /• G

1,366(10) 2+

455 (12) 3,49 (36) 10-4

4,37 (35) 21,7 (25) 1,36857(4) 2* viele, Mittelwert 25,9+ 24

nacfa“ 4428 (10) 2+

24,1 (20) 5,26 (92) 10-3

4.12(66) 1,15 (20) 4433 (7) 2

>14,7“ 1.10(20)“,

0+

(2+

) 245 (46) 7

, (1,66) 41 6,436 (13) 643 (62) ME - 5,66 (85) — 6,436 (16) 0

+

7,335 (20) 2+

8,01 (79) 2,78 (58) 10-2

4,60 (75) 0,38 (8) 7,349 (8) 2+

1,30 (17) 5

. 1,9 6,0,72 4X 7,600(21) 3“ 1,60 (31) 103 BA 1,26 (43) 10“ 4 54 (12) 6,5 (22) 7,620 GO) 3“ 2 4,96 5

, 2,34 4 8,375 (18) 3" 2,60 (22) 103 BA 4,04 (67) 10~ 4 4,12(76) 10,5 (17) 8,357 (10) (3->4 2,60 5

, 1,33 s

, 2,9 4, 4,1741 8,995 (21) 2+

3,57 (38) 3,39 (78) 10“ 2 4,22 (84) 0,17 (4) 9,004 (12) 2+ 2 9,304(19) 2+

(0+

) 11,22 (91) 0,126 (23) 4,34 (64) 0,534 (97) 9482 (12) 9,846 (20) 1 +

3,14 (27) 10-3

1.05 (26) 3,30 (60) 0,052(13) 9,826 (12) 9,972 (17) 1 +

1,300(44) 10" 2 4,50 (73) 3,05 (44) 0,216(35) 9,984 (16) G

+

) 0469 (48) l4

, 0,9*, 047(13)“

10,363 (19) 2 +

(0+

) 7,56 (61) 0,146(31) 4,31 (86) 0,360 (76) 10,353 (20) 10,716(18) <0+

) 3,79 (65) ME — (5,66) — 10,683 (5) 0+3

1 +

3,71 (16) 15,9 (24) 3,22(47) 0,616(93) 10,737 (9) G

+

)

5,? (17)*°, 0,90 (18) 11

, 0,66 (10) 14 0,73 (14)“

10,939 (20) 2+ 748 GO) 0,184(58) 4,7 (10) 0,34 (11) 10,924 (5) 2+ 3 >0,37 3 11,474(30) <2+

) 5.33 (38) 0,177(44) (4,30) 0,26 (7) 1 i,459 (5) 2+ 3 >0,13 3 11.460 (5) 0*

[over

j

FORM NBS-418

(R EV. 7-1 4-«4) USCOMM.OC 28 010- Pfl 4 PHOTONUCLEAR DATA SHEET 312

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOAROT
Fig. 2. Zusammenstellung der aus den korrigierten Wirkungsquerschnitten berechneten B(X i, q) Werte als Funktion von q

2

. Fur C 3-0bergange sind die unkorrigierten Werte angegeben, berechnet aus <r'(s. Gl. (14))
L. W. Fagg, W. L. Bendel, S. K. Nurarich and B. T. Chertok

Phys. Rev. Cl, 1137 (1970)

I EL EM. SVM.

Mg 24 12

| 70 Fa 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYRE RANGE

E.E/ LFT 9-14 D 39.56 MAG-D 180

No new data- analysis of data found in 68 Fa 1. REANALYSIS OF 68FA1

The data of an earlier paper presenting the results of 180* electron scattering from "Mg have been re- examined using more refined data-treatment techniques. Present results favor an assignment of 2~ for r— 1 states at 12.91 and 13.37 MeV with estimates for radiation widths T« of 0.11 and 0.13 eV, respectively. Revised transition widths for the l

4-

, T— 1 states at 9.94 and 10.70 MeV are found to be 7.6 and 17.6 eV,

respectively, in better agreement with results of other workers.

Table I. Values of differential cross sections, spin and parity, transition radii, and radiation widths for energy levels excited in "Mg.

Transition radii and radiation widths have been co, -ccted to the distorted-wave theory.

Level energy (MeV)

(da/dil) t. {d*r/d&*)»

( 10~" em'/sr) J' Rh

(fm)

r. (eV)

9.94±0.03 104±5 202=1=15 1 + 2.94_.j»+,- u 7 .6_i .+1 -'

10. 70i0. 03 194±7 372±21 1 + 2.94_,J ,4«-“ 17. 12.91±0.06 76±18 58±33 (2‘) 3.9^A 0.11.4x.

4*-" 13.37±0.05 95±18 63±38 (2-) 0.13-,..4*41

FORM HBS-'ilS (REV. 7-1 USCOMM.QC 26010-P64 PHQTONUCLEAR DATA SHEET 314

U.S. DEPARTMENT Or COMMERCE

ATIONAL 9UREAUOP 5T A N O A R O S
.

.

'
REF- A. Goldmann

Z. Physik 2^4, 144 (1970)

ELEM. SYM.

Mg 24 12

j REF. NO.

| 70 Go 3 egf

REACTION RESULT EXCITATION SOURCE detector

ENERGY TYPE RANGE TYPE RANGE ANGLE

l+UL ABX 15-26 D 45-55 MAG-D DST

Fig. I. Riesenresonanz von 24 Mg. Oben: Absorptionswirkungsquerschnitt nach

Doloolkin et al. 3

, unten: a(y,n) nach Fultz et al. 29

. Mitte: Spektrum unelastisch

gestreuter Elektronen. Der Strahlenschwanz wurde nicht subtrahiert, der Nuilpunkt surk unterdruckt. £, und Ey sind Anregungs- bzw. Photonenenergien. Der zur Fiachenbestimmung angenommene Untergrund und die Integrationsgrenzen sind

gestrichelt eingezeichnet. Die r I ache der eiastischen Linie iu J,0 * iO3 MeV/p A*

[over

j

FORM NBS-4 18 (REV. 7-1 4.64) USC OMM-DC 26010-P64 PHQTONUCLEAR DATA SHEET 315

J.S. CEP ARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Tabelle2. Ergebnisse an 24Mg. Bei alien iVerten 1st A E =S,0 • 10* Me Flu As. Die

Flaclien Aj warden con 16,0 bis 22,0 MeV intcgriert. Bei der Auswertung wurden die

ini Text erwdlmten Strahlungskorrekturen 12,23 nur an der elastiscJien Flaehe angebracht (K,=*1,0 in Cl. (2)J. Die getrennte Auswertung der Bereiche oon Ex —I6,0 bis 18,0 Me V und von Ex = 18,0 bis 22,0 MeV lieferr mil den obigen Oaten konsistente Ergebnisse

£^[MeV] 6 [Grad] </2 [fm -2]* MeVl

U As

CflO-*]" £(Cl,«)[rm*]

54,5 129 0,17 24,5 4,53 1.01 50,4 153 0,16 48,0 2,45 0,95 U,3 153 0,12 26,5 2,41 1.05

• bei £x = 19,7 MeV. * G=*(dolda)t (k2IVT).

Fig. 2. Reduzierte Matrixelemente fur den Bereich von 16.0 bis 22,0 MeV in 24 Mg.

Die Photonenwerte (. entspricht 145 MeV mb, . entspricht 110 MeV mb) wurden

aus J-2 berechnet. Die Kurven zeigen die Extrapolation zum Photonenpunkt fur R\ r = 1.3 Rm (ausgezogen) bzw. Rlt = Rm (gestrichelt)

316
REF V.M. Khvastunov, N.G. Afanas'ev, V.D. Afanas'ev, E.V.

X.S. Gul'karov, G.A. Savitskii, and N.G. Shevchenko

Yad. Fiz. 12, 9 (197°)

Sov. J. Nucl. Phys. 12, 5 (1971)

METHOD

Bondarenko, ELEM. SYM.

Mg

REF. NO.

A I Z

2W 12

TO Kh 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECT O R ANGLE TYPE RANGE TYPE RANGE E,E/ FMF 1 D 225 MAG-D DST

(1-37)

L=.1Q7

Elastic and inelastic scattering of 225-MeV electrons by the isotopes Mg” and Mg2® have been

measured. Analysis of the data was carried out in the Born approximation. From analysis of the

elastic scattering for a uniform- Gaussian charge-distribution model it is found that addition of two

neutrons to the Mg2* nucleus leads to an increase in the parameter R by 0.03 ±0.02 F and a de- crease in g by 0.07 ± 0.04 F, which corresponds to a decrease in the mean-square radius of the Mg2 ® nucleus by (1.6 ± 1.3)% in comparison with Mg2*. Analysis of ‘he inelastic scattering with

excitation of the first V level shows that the internal quadrupole moments of the nuclei Mg24 and Mg2 ® are identical within experimental error.

FIG. 3. Form factors for inelastic scattering with excitation of the

first T levels, 1.37 MeV in Mg44 (a) and 1.81 MeV in MgJ6 (b). The

solid lines are theoretical curves calculated with Eq. (3).

Characteristics of the first 2" levels of the nuclei Mg2* and Mg28

Nucleus

Level energy. MeV 02(0+, 2+) B(E2T).

e

2 F*

r, 10' 13 sec G Oo. F

2

\ie'« ! Mg5 * I

I o.:u -11.02

1

| 0.25 -o.ot | 412 - 43 20.5-2.1

349 — 30 f>. 04 — 0.32

20.1 -2.1 t-4 -4

15.2 -1.3 59 b 3

FORM NBS-418

1R E V . 7-14- 04) USC OMM-O C 26010-P64 PH0T0NUCLEAR DATA SHEET 317

U.S. DEPARTMENT of commerce

NATIONAL BUREAU OF STANOAROS
P. Strehl

Z. Physik 234« 4^-6 (1970)

REF. ELEM. SYM. A Z

method

Mg

REF NO.

24 12

70 St 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E . R./ ABX 6 D 31-59 MAG-D DST

( 6.44)

Tabelle 3. Experimented Parameter und Mcfiwerte. E0 , 9 Primarenergie, Streuwinkel

ini Laborsvstem. q unelastischer Impulsiibertrag. alaE gemesscnes Verhaltnix van

unelasrisehem :u elastischem differcntieilcn W'irkungsquersehnitt; in Klammer ist der , . statistische Fchter in % angcgeben. dajdQ imelaslischer diffcrenticller Wirkungsquer- — — —* schniu ; wegcn dcr Fehlerangahcn igl. Text. Die Mefiwerte fiir Si und S sind als Ergebnisse fur na,Si und na,5 aitfzufasscn (igl. Text)

(MeV)

9

o

d

2(fm 2

) (io- 4

) da/dO

(10-33 cm2/ster.)

l2C 7,65 MeV 59,58 117,04 0,231 14,90 (0,6) 24,69 ±1,60

56,94 129,02 0,231 13,79 (1,0) 1 3,68 ±0,96

54,12 141,11 0,229 14,98 (0,7) 8, 1 5 ±0,55

52,75 153,15 0,231 15,24 (1,0) 6,62 ±0,47

51,90 165,05 0,231 15,78 (1,8) 1,16±0,09

51,18 104,98 0,145 5,80 (0,7) 28, 80 ±1,69

47,90 117,04 0,145 5,51 (0,7) 17,19 ±1,01

45,48 129,02- 0,145 5,97 (1,2) 11.14 ±0,71

43,57 141,11 0,143 5,95 (1,1) 6,09 ±0,38

42,54 153,15 0,145 5,82 (1,4) 2,67 ±0.18

37,51 104,98 0,074 1,41 (1,4) 15,38 ±1,07

35,08 117,04 0,073 1,33 (1,6) 9,14 ±0,57

33,39 129,02 0,073 1,44 (1,7) 5,89 ±0,37

32,04 141,11 0,073 1,39 (2,0) 3,11 ±0,21

31,36 153,15 0,073 1,39 (3,2) 1,39 ±0,11

24 Mg 6,44 MeV 59,01 116,94 0,232 5,53 (2,2) 28,28 ±2,24

55,81 129,03 0,231 5,41 (1,5) 16,65 ±1,20

53,64 140,95 0,231 5,65 (1,6) 9,51 ±0,70

52.14 153,00 0,231 5.17 (2,1) 3,95 ±0,32

c ; 104,96 0,074 0,59 (2,6) 25,08 ±1,78

• +.i ? 116,94 0,074 0,56 (3,2) 15,09 ±1,16

32,87 129,03 0,074 0,58 (2,8) 9,37 ±0,68

31,72 140,95 0,074 0,58 (3,1) 5,10 ±0,39

30,86 153,00 0,074 0,68 (5,5) 2,69 ±0,27

Si 4,98 MeV 58,38 116,94 0,232 5,61 (1,9) 38,70 ±2,68

55,12 129,03 0,231 5,27 (0,9) 21,98 ±1,34

52,87 141,11 0,231 5,58 (1,3) 12,72 ±0,81

51,28 153,00 0,230 5,69 (1,9) 6,00 ±0,42

49,93 104,96 0,145 2.05 (1,6) 49.60 ±3,13

49,97 104,96 0,146 2,10 (1,4) 50,68 ±3,09

46,77 116,94 0,146 2,23 (2,2) 33,90 ±2,31

44,28 129,03 0,146 2,14 (2,0) 19,48 ±1,29

42,44 141,11 0,146 2,20 (1,7) 10,98 ±0,70

41,23 153,00 0,145 2,45 (2,1) 5,64 ±0,38

41,37 153,00 0,146 2,48 (2,5) 5,67 ±0,40

36,28 104,96 0,074 0,53 (4,5) 32,51 ±2,90

36,26 104,96 0,074 0,56 (4,0) 34,35 ±2,89

33,98 116,94 0,074 0,55 (4,3) 21.28 ±1,83

32,17 129,03 0,074 0,52 (4,0) 11,98 ±1,00

30,87 141,11 0,073 0,59 (5,3) 7,54 ±0,73

29,96 153,00 0,073 0.66 (5,7) 3,89 ±0.39

30,09 153,00 0,074 0.60 (5,0) 3,52 ±0,33

Si 6,69 MeV 58,38 116,94 0,225 0,48 (25) 3,30 ±1,00

S 3,78 MeV 59,19 101,96 0,210 0,32 (37) 5,17 ±3,36

58,80 101,96 0,209 0,27 (45) 4,40 ±3,30

'"Cz 3,35 MeV 53,98 1 10,95 0,250 0.92 (9) 3.03 ±1,2!

form NBS-418

ir ev . 7- I *-«4> USCOMM-OC 26010-P64

Fig. 3. MeQergebnisse fur Monopolubergange in 24 Mg(6,44 MeV), 23Si(4,98 und

6,69 MeV), 32 S(3,78 MeV) und -*°Ca(3,35 MeV) als Funktion von q

2

. Die einge- tragenen MeBpunkte und die zugehorigen Kurven gelten fur eine Auswertung mit fc , x{ und xz nach Model! I. Fur :5 Si(4,98) sind nur die aus <x/crE und Df* berechneteo

longitudinalen Anteile aufgetragen (vgl. 5.1), wobei die MeQpunkte

P

bei gleicher Impulsubertragung und gleichem Streuwinkel (vgl. Tabelle 3) zusammcngefaOt wurden. Die gestrichclten Kurven zeigen die Extrapolation nach q=0 mit vorgegebenem

Ubergangsradius
REF - D. V. Webb, E. G. Muirhead and B. M. Spicer

Nuc 1 . Phys. A159 . 81 (1970)

EL EM . SYM. A

Mg 24 12

REF. NO.

70 We 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,N ABX 17-32 C 17-32 ACT

4PI

$ >'i- -+

Fig. 2. Analysis of the J, = 50 keV data to 22 MeV in J, = 100 keV bins for the photoneutron

cross sections of fa) silicon and (b) magnesium.

24

) S .C . Fultz, J.T. Caldwell,

B.L. Berman, R.R. Harvey and

M. Kelly, Bull.Am.Phys.Soc.

14 (1909J 103.

c= )j. Miller, C. Schul, G. Tamas

and C. Tzara, J.de Phys.27 (1966)8.

2b

)K. Min and W.D. Whitehead, Phys.

Rev. 137B (1965)301.

2/ )D.W. Anderson, B.C. Cook and

T.J. Englert, Nucl. Phys. A127

(1969) 474.

Table 3 Integrated cross sections for magnesium

Source r2A MeV

1 <Td£ (MeV • mb)

J 0

f 3 1 M.V

J trd£ (MeV • mb)

this experiment 35±4 72±7

(62.S±6to 29 MeV)

Fultz el al. 33.7 66.8 (to 29 MeV)

Anderson el al. 11

) 52 115

Miller et al. “) 45±7

Min and Whitehead J ‘) 60

over]

FO RM N8S-418 REV. 7-14- 04) use O MM- O C 20CM0-P04 PHOTQNUCLEAR DATA SHEET 319

u.s. department OF commerce

NATIONAL SUREAUOF STANOARDS
3

Fig. 5. The photoneutron cross section for natural magnesium. The full circles indicate the coarse

resolution measurement (J, = 250 keV, J, = 500 keV). The higher resolution measurement

(A, = 50 keV, A, = 200 keV) is presented by the error bars up to 25 MeV. The predictions of

Nilsson et al. *) are shown by the heavy dashed (

K

= 0) and continuous (K — 1 ) bars.

9 )S.G. Nilsson, J. Sawicki and

N.K. Glendenning, Nucl. Phys.Jii (1962)239.

320
BEF- R. J.

Phys.

Baglan, C. D. Bowman and B. L. Berman

Rev. £2, 672 (1971)

ELEM. SYM. A 2

Mg 24

METMOO REF. NO.

12

71 Ba 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

g t n ABX 16-20 C 17,20 TOF-D 135

(16.6-19.5)

^Hl

FIG. 15. The 135* differential threshold photoneutron cross section for l4 Mg (see caption to Fig. 4).

FIG. 4. The 135* differential threshold photoneutron cross section for :07Pb at low energies versus the energy of the emitted neutron (lower scale) and the excitation energy (upper scale). The arrows indicate peaks which decay to excited

states of the residual nucleus (ES), or peaks owing to contaminating Isotopes in the photoneutron sample. The inset shows the ‘ 'Pb(y.n) cross section averaged with a square 40-keV wide smoothing function.

Also see:

R. J . Baglan et al.

Phys. Rev. £2, 2475

(1971)

! over 1 porm NBS-418

(R EV. 7-1 4-041 USCOMM-OC 20O1O-P04 PHOTONUCLEAR DATA SHEET 321

U.S. (DEPARTMENT OF COMMERCE

NATIONAL BUREAU OR STAnOARC'
TABLE VII. Resonance parameters for - 4,25 -"°Mg, ,S F, and ‘P. For all resonances, the area under the peak in the 135 = differential cross section is multiplied by 4 tt to yield approximate values for ^y r ro rn /r X' y0 - For those reso- nances where J

is known, the differential area is multiplied by the appropriate factor F from Table I to obtain r y0 . E is the laboratory neutron energy for the (y,n) reaction and E„ is the corresponding laboratory neutron energy for a neutron-induced reaction. Column 5 labels the peak as a ground-state (GS) or excited-state (ES) transition as deter- mined in this work alone

.

Nucleus El

(keV) (MeV)

EyEyo /r

(eV)

GS

orES J

* (eV) E„ (keV) (This work)

24Mg 22 16.559 0.61 (1~) 0.40 28

55 16.596 2.4 GS <l-> 1.6 66 no 16.656 4.0 GS (1-) 2.7 128

312 16.871 10.7 <1“> 7.1 3 354

382 16.95 432

717 17.30 19.5 (1") 13.0 3 804

1210 17.83 1348

1620 18.26 1799

1955 18.61 2168 “Mg 41.1 7.374 0.09 GS

46.8

45.1 8.746 0.31 ES

74.9 7.410 0.36 GS 3— b

2 1.1 84.1 b 208 8.920 0.29 ES

236 7.580 0.09 GS 261 404 7.756 0.03 445

439 7.793 0.05 5 + C

2 484

472 7.828 0.06 520

515 7.873 0.46 GS 3 + C

2 567

601 7.964 0.18 661

781 8.152 1.51 GS 857 912 8.292 0.72 1003

1236 9.999 2.4 c ES | + or 1

+

c

1707 9.12 1869

1764 9.18 1931

26 Mg 54.3 11.155 2.6 GS l'(l + ,2 +

) 1.75 62.3

63.2 11.164 0.05 0.034 72.2 181 11.289 1.0 GS 1~(1\2+

) 0.68 202

222 11.333 1.9 GS 1~(1 +, 2

+

) 1.3 248

391 11.511 5.1 GS i-(r , 2

") 3.5 433

621 11.753 32.5 GS 1"(1- ,2*) 22.2 684

738 15.0 d ES 5.1 1122 12.279 14.7 GS i'ir , 2

+

) 10.0 1232

19-p 100 10.542 1.8 GS 113

3tp 109 12.429 0.86 121 280 12.609 0.60 307

398 12.732 0.59 434

678 13.026 0.90 737

939 13.297 4.4 1013

a These values for r, ot when increased by approximately a factor of 2 in order to include the relatively high cross

sections in the valleys, agree very well with corresponding values from Ref. 9 (see Ref. 4).

b This resonance was seen at En =83 and 34 keV in Refs. 24 and 25, respectively.

c Analogs of states in 25 Na (see text). The value for gy r ro rn / V given in Ref. 26 was not corrected with the multiplicative factor in Table II. d Assuming a first-excited-state transition.

Van Hemert, C.D. Bowman, R.J. Baglan, and B.L. Berman (to be published);

R.L. Van Hemert, University of California Lawrence Radiation Laboratory Report

No. UCRL- 50442, 19b3 (unpublished).

8

S.C. Fultz, M.A. Kelly, J.T. Caldwell, R.R. Harvey, and B.L. Berman, Bull. Am.

Phys. Soc. _14, 103 (1969), and private communication.

^H.W. Newson, R.C. Block, P.F. Nichols, A. Taylor, A.K. Furr, and E. Merzbacher,

Ann. Phys. (N.Y.) 8, 211 (1959).

2

**D.J. Hughes and R.B. Schwartz. Neutron Cross Sections (U.S. Government Printing

Office, Washington, D.C., 1966), 2nd ed., 2nd Suppl., Vol. lie.

322
S.C. Fultz, R.A. Alvarez, B.L. Berman, M.A. Kelly, D.R. Lasher,

T.W. Phillips, J. McElhinney

Phys. Rev. C^, 149 (1971)

ELEM. SYM. A Z

Mg 24 12

1_

i METHOD REF. NO.

! 71 Fu 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,N ABX 16-29 D 16-30 BF3-I 4PI

3M-1. 14 LEVEL FIT

FIG. 3. ,4 Mg total cross section <r((y,n) + <y.pn)) fitted with a calculated cross-section curve. The solid line is the sum of the 14 Lorentz lines whose parameters were adjusted to fit the data.

TABLE II. Integrated cross sections of magnesium

isotopes.

Isotope

r u

<r(Y,n w,jd£

CMeV mb)

r«

/ vfy, 2 n)dE J*xhtCMeV mb)

:4 mr 30

:s Mg 226 68 Natural 76 magnesium

[over]

roRM NBS-418

IR E V . 7 • 1 4- 04) USCOMM-OC 26010-P64 PHOTQNUCLEAR DATA SHEET 323

U.S. DEPARTMENT OF COMMERCE

national bureau of standaros
TABLE m. Analytical and experimental resonance enorglcs for :4 Mg (MoV)

Resonance number

Analytical energy

Present

data

<T. »tot)

Experimental energies

Livermore Yale Darmstadt

(Ref. 15) (Ref. 14) (Ref. 12)

(y. «») (y. »o) (c. e“)

Argonne

(Ref. 2)

(y. Po>

1 16.92 16.90 16.871 16.90 16.9 16.95 17.08 17.2

2 17.32 17.30 17.30 17.33 17.35

3 17.55 17.65 17.83 17.83 17.60 17.5 17.95 17.90 18.15 18.21

4 18.33 18.30 18.26 18.36 18.50 18.25

5 18.75 18.82 18.61 18.58 18.85 18.5 6 19.16 19.17 19.21 19.23 19.0 19.48 19.3

7 20.00 20.05 19.95 20.10 20.1

8 20.40 20.36 20.35 20.4

9 20.80 20.90 20.77 20.7 21.16

10 21.4S 21.45 21.50

11 22.35 22.35 22.28 12 23.10 23.10 23.02 23.42

13 25.00 25.00 25.05

14 27.50 27.50

^R.C. Bearse, L. Meyer- Schutzmeister, and R.E. Segel,

Nucl. Phys. A116 . 682 (.1968).

0. Titze, E. Spamer, and A. Goldman, Phys. Letters

, 169 (1967).

12

14,C.-P. Wu, Ph.D. Thesis, Yale University, 1968

(unpublished)

.

15

R. J. Bag lan,

Phys. Rev. C3 ?

C. D. Bowman,

672 (1971).

and B. L. Berman,
Y. Horikawa, Y. Torizuka, A. Nakada, S. Mitsunobu, Y. and M. Kimura

Phys. Letters 36B , 9 (1971)

METHOD

Kojima,

Mg 24

REF- NO.

12

71 Ho 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE

E,E/ FMF D 183,250 MAG-D DST

1. 37, 4. 12 MEV

Ftg.l.The experimental form factors for the V members of the ground-state rotational bands In 20Ne,

24 Mg and 2Hg| are shown as a function of the qeff (3).

Fig.2. The same as for fig. 1 except for the 4

+ members.

The unresolved data of the 4.12 MoV (•»’') and

4.23 MoV(22> 3^e8 I* presented in the case of 24nig#

(over)

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANOAflOS form NBS-418

(R EV. 7-1 4- 04 ) USC OMM-OC 26010-P04 PHOT0HUCLEAR DATA SHEET 325
(2) R. de Swiniarski, D. Glashausser, D. L. Hendrie, J. Sherman, A. D. Bacher,

and E. A. McClatchie, Phys. Rev. Letters 23 (1964) 317.

(3) D. G. Ravenhall , quoted in: R. Hof stater, Rev. Mod. Phys. 28 (1956) 214.

(5) H. Rebel, G. W. Schweimer, J. Specht, G. Schatz , R. Lohken, D. Habs,

G. Hanser and H. Klewe-Nebenius , Phys. Rev. Letters 26. (1971) 1190.

Table 1 The values obtained from the Nilsson orbits which provide the best fit form factors. The signs of the moments were

determined by the characteristic of the orbits. The 02 nncl 04 vn l uu3 of the present study are compared with those

of the (p. p') [ 2 1 and (dr. or') (5) reactions.

<r

2

> 1/2 <W* Q0 Ho 02 04

(fm) (fm) (efm2

) (elm*) present

<e,e')

<P.P') (O . or ') present

(e, e')

(P. P’> (Of. Of*)

20 Ne 2.31 3.14 +58 ±3 +249 ±27 +0.40 +0.47 +0.35

±0.01 +0.19 ^00

lO

CN1 O

O

O

+

•** +0.11

±0.01

2 -*Mg 3.03 3.24 +69 ±3 + 48 ±16 +0.45 +0.47 -0.06 -0.05

±0.08

28 Si 3.14 3.35 -64 +3 +205 ±33 -0.39 -0.37

-0.32

±0.01 +0.10

+ 0.25

+0.08 ±0.0810.01

326
REF.

E. J. Moniz , I. Sick, R. R. Whitney, J. R. Ficenec, R. G. and W. P. Trower

Phys. Rev. Letters 26, 445 (1971)

METHOD

Kephart

ELEM. SYM. A

Mg 24 12

71 Mo 3 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ ABX 0-240 D 500 MAG-D 60

T.'iIiIp 1. Niirlortp I’ornil inriim<ritiim by mill nvfrago

init'liMiii Inloriirllon «ii<<rgy . (Iilnrriiliic<l tiy lo.-mt- «|uar<‘H fit of Lhoory to qun.slclustic peak.

€ Nucleus (MeV/c) 1 (MeV) b

3 Li8 169 17

s c

12 221 25 nMg24 235 32

;o Ca‘° 251 28

2 8 Ni53 * 7 260 36

33Y39 254 39

soSn

118 - 7 260 42

; 3 Ta18t 265 42

32 Pb208 265 44

a The fitting uncertainty in these numbers is approximately ±5 MeV/c.

b The fitting uncertainty in these numbers is approximately r3 MeV. Simple estimates for e give numbers

in reasonable agreement with those in the table.

FORM N3S-413

(R EV. 7-1 4-64) USC OMM-O C 2Q010-P64 PHOTONUCLEAR DATA SHEET 327

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
C. P. Swann

Phys. Rev. C4, 1489 (1971)

REF. ELEM. SYM. A Z

METHOD

Mg 24

REF. NO.

12

71 Sw 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,G LFT 1 D 1 SCD-D 127

(1. 368) (1.468)

1. 368 MfiV 2+ STATE

A mean life of 1.92 ±0.15 psec has been obtained for the 1.368-MeV 2* state of J1 Mg by compairing the resonant scattering of y rays through the 2l Mg level and through the 1.333-MeV 2* state of s0 Ni , the lifetime of which is known accurately. This value is in good agreement with recent Coulomb-excitation results but differs markedly from a recent resonance-fluorescence

self-absorption result.

TABLE I. Mean lifetime of the 1.368-MeV level of 24 Mg.

Method

T

(psec) Reference

Resonance-fluorescence scattering 1.92 ±0.15 Present Resonance-fluorescence scattering 1.95 ±0.26 3 Resonance-fluorescence scattering 1.11 ±0.13 2 Inelastic electron scattering 1.9 ±0.2 5 Coulomb excitation 2.00 ±0.10 i Coulomb excitation 2.04 ±0.14 4

form NBS-418

(R EV. 7-1 4- 64) USC OMM-O C 26010- PS

4

PHOTONUCLEAR DATA SHEET 328

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. EL EM. SYM. A

B. S. Ishkhanov, I.M. Kapitonov,

and V. G. Shevchenko

Nucl. Phys. A186 , 438 (1972)

METHOD

E. V. Lazutin, I.M. Pi akarev,

Mg

REF. NO.

24 12

72 Is 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

angle

TYPE RANGE TYPE RANGE

G.XN ABX 16-30 C 16-30 BF3-I 4PI

548

Table 2 The maxima of the fine structure of the giant resonance in 24 Mg and the corresponding resonances of

intermediate structure

Ref. '») Ref 11

) Ref. ,0> Present work

Resonances

of inter- mediate

structure (MeV)

16.?: 16.6 16.00 16.92 17.0 16.85 J 0.08

(17.08)

17.33 (17.60)

1 7.00

17.32 (17.55)

17.2 17.6

17.8

17.40i0.08 17

(i8.:i)

1 8.50 18.33 18.5 18.30i0.09

18.85 18.75 18.9 18.85 ±0.09 19

19.23 19.16 19.3 19.30i0.l0

19.74 :o.io

20.35

20.00

20.40

20.3 20.20 i0. 10

(20.77)

(21.16)

(21.50)

(20.80)

21.45

20.7

21.2 2J.45±0.13

20-21

j

j 548

22.28

(23.02)

(23.42)

22.35 23.10

22.5 22-50 ±0.15

23.2 23.35±0.15 23 Jh

(24.06) 25.05 25.00

24.1 (25.8) 24.6 ±0.2

26.3 ±0.2

25

t: </

) )

\

!

1

! 10

D. V. Webb et_ al. , Nucl. Phys. A159 (1970) 81 L-i

S. C. Fultz et al.

^0. Titze et_ aL t

, Phys. Rev. G4 (1971) 149

Phys. Lett. 24B (1967) 169

* 10 l' it FI*. 1. Crou section for n) + (y, np).

FORM N3S-418

(R EV. 7-1 4-64) USCOMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 329

U.S. DEP ARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
A. Nakada & Y. Torizuka

J. Phys. Soc. Japan ^2, 1 (1972)

Ei_ EM. a i M.

Mg 24 12

METHOD REF. NO.

72 Na 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

E,E/ LFT 1-6 183-250 MAG-D DST

».* cr'j

Fig. 5. The inelastic form factors for the 1.37-(2 +

), 4.20-McV (2 +

) states in “Mg and for the 1.78- McV (2+) in “Si are shown as a function of q.a. The curves are the best fit form factors calculated with the Born approximation.

1. 37,4. 23,6.00 MEV

Fig. 7. The inelastic form factors for tho 6.00- McV(4+) state in “Mg . and 4.61-MeV(4 ,,‘) state

in “Si.

Table II. Tho B(EL) values extracted from the experimental form factors. Bom approx.

form N3S-418

(REV. 7-1 4-64) USC OMM-O C 26010-P64 330

DWBA

Nucleus E. (McV) J’ B(EL)

(W.U.)

B(EL)

(e*F«) B(EL) (W.U.)

i B(EL)

(c*FJA

) 1.37 2+ 18.1±1.7 (3.27±0.35)x 10* 21.7±2.2 (4.46±0.45)xl0»

“Mg 4.23 2+ 1.11 ±0. 18 (2.28±0.37)xl0

6.00 4+ 10.6 2.87 x IO

1.78 2+ 11.1±1.5 (2.80±0.38)x 10* 13.7±1.3 (3.46±0.33)xl0*

4.61 4+ 4.35±0.49 (1.78x0.20)x 10* “Si

6.88 3- 8.99±0.71 (2.93±0.23)x 10* 9.70 3- 1 .88 ±0.30 (6.13±0.98)xl0*

I
A.H. Chung, W.T. Diamond, A.E. Litherland, H.L. Pai,

and J. Goldemberg

Phys. Lett. 53B, 244 (1974)

EL EM. SYM. A Z Mg 24 12

METHOD REF. NO. 74 Ch 9 egf

REACTION RESULT EXCITATION ENERGY

SOURCE detector

ANGLE TYPE RANGE TYPE RANGE E.C12 NOX 24- 29 D 25- 29 TRK-I DST

adE>3.0±0.6 ub-MeV

Fig. 1. The angular distribution of giound-state carbon nuclei from the electron induced fission of 24 Mg at £e = 27 MeV is shown together with the function sin 2 29.

The electron induced fission of * 4 Mg leading to the ground states of two carbon nuclei has been studied using 25 to 4 5 MeV electrons. The observed sin 2 29 angular distribution of the carbon nuclei indicates the dominance

ot E2 virtual photon absorption. The yield of ground state carbon nuclei is observed to decrease with increasing

excitation energy in 24 Mg above 24 MeV.

N3S-418

U.S. OEPARTM = nTQNAT'ONAL SUREAu.C- S CO 4,)APC - I A- 641 t-OC 260I0-PS4 PHOTONUCLEAR DATA SHEET 331
'
A. Johnston and T.E. Drake

J.Phys.A: Math., Nucl.Gen. 7_> 898 (1974)

CL CM. SYM.

Mg 24 12

METHOD ReF. NO.

74 Jo 4 egf

REACTION result EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE E,E/ LFT 1- 14 D 64-116 MAG-D DST

2 2 F (q), F

T

(q) plots given.

19 STATES

Figure 5. F (;(</) for the 2

' states at 1-37 MeV. 4-23 MeV and 9-30 MeV.

Table 1. Kinematics of the experimental runs.

Run Number Energy (MeV) Angle (deg) (fm~ ‘>

1 91-50 120-0 080

2 81 66 154-0 0-80 3 110-82 120-0 0-97 4 99 21 153-0 0-97

5 64-94 154-0 064

6 70-92 120-0 0-62

7 73-81 153 0 0-72

8 110 07 800 0-72 9 115-67 153-0 1-14 10 72-6 65 0 0-40

(over) Figure 6. Fu(q) for the 4 * state at 6 00 MeV

form N3S-418

IP E V . 1 A- 64) USCOMM-OC 26010-P64

U.S. DEPARTMENT Q c DOMMEPCN ATI ON A L. BUREAU C ~ S V / v 3 4 0 S PHOTONUCLEAR DATA SHEET 332
Table 5. Results for the states with £, < 1 1 MeV.

£, (MeV) J'

Tassic model Helm model

<1M t(rm) B(YLt)e2 fm :<- £„(fm) R(fm) £(Y£T)e: fm :i £,,(fm)

1-37 2* 2-88 2-06 420 ±25 4-11+0-03 3-03 411+23 4-03 + 0-07

4-23 2* 2-91 2-08 26-3 ±6-0 +14 + 0-30 3-10 25-5 + 4-0 +09 + 0-20 600 4* 2-48 1-93 (4-2 ± 1-0) x 10* +90+0-70 3-0 (3-6 ± 1-0) x 10* +50 ±0-50

6-43 0* 5-14 6-7 + 0-4(me) 6-05 ±0-20

7-59 3' 2-68 2-08 (1-36+0-22) x 103 +57 ±0-40 3-17 (1-30 + 0-16) x 10 3 +39 ±0-22

8-37 3‘ 2-61 2-09 (2-0 ± 0-2) x IQ 3 +55 ±0-38 3-03 (1-80+0-20) x 10J +28 ±0-22

9-30 2* 3-18 2-36 12-0 ±2-0 4-62+0-30 3-56 11-3 ±1-5 +45 ±0-19

9-97 \* 2-45 2-90 (l-38±0-20)x 10" 2 2-83 ±0-30 (1-34 + 0-15) x 10” 2 2-70 ±0-20

10-35 4* 3-0 (1-2 + 0-4) x 10* +5

10-70 1* 2-64 2-90 (3-1 1 ±0-40) x 10"* 2-91 ±0-40 (3-15+0-30) x 10' 2 2-74 ±0-30

Table 6. Results for the states with £, > 11 MeV.

Helm model

£,(MeV) J

* R(fm) ..0

/ fl(Y£T)e2 fni- 1 £, r (fm)

111 3" 303t 20 6-2 x 10 2 +3

11-38 2* 3-I0t 0-4 ±0-2 2-5 +0-7 + 1

1 1 86 (I-.3-) 303t — 2-6 x 10 _6

(E1)

( 3-4 ±0-5) x 10 2 (E3) +3

11 99 3" 3-03t l-0±0-2 (I 4±0-2)x 102 +3

12-39 3~ 3-031 — (2-0 + 0 2) x 102 +3

12-52 2

* 3-10t 0-63 ±0 05 2-2 +0-4 4-1 12-7J 2“ 0 42 ±008 1-6+0-

3

0-26 ±0-10 2-5 + 10

12-99 2* 3-10t 0 85 ±0 05 3-7 + 0 6 + 1 13-37J 2

- 0-63 ±0-11 2-2 ±0-4 0-58 ±0-20 2 5 ± 10

f Parameter fixed at value obtained for a lower energy transition of the same multipolarity. 7” and y’’ are given under R and y° respectively.
REF. G. C. LI, M. R. Yearian, and I. Sick

Phys. Rev. C9, 1861 (1974)

I

-- - METHOD

REACTION RESULT EXCITATION ENERGY

SOURCE 0ET ECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ FMF 1- 6 G 250,500 MAG-D DST

EL EM. SYM.

Mg 24 12

REF. NO.

74 Li 2 hmg

Detailed elastic scattering data tables for

24.. 27.. 28

Mg,~" Al, Si, and

32

S.

E F

2

tq) FOR THE 4 12 MeV (4") LEVEL ANQ C THE 4.23 MeV (2*) LEVEL IN ^“V(j

Ijii „

250 MeV

500 MeV

r r

F

2

(q, E

h

I0' 5 b-c

f

I0's t-F

ium

i

• ; *•

15 2.0

q (fm~ ') —

4 LEVELS 1. 37 to 6.00

FIG. 10. Experimental form factor of the 4.12-MeV

(4

+

) and the 4. 23- MeV (2*) levels in 24 Mg.

FIG. 9. Experimental form factor of the 1.37 -MeV (2+

) level in 24Mg.

F

2

(q)

=E F

2

(q) FOR THE 6.00 MeV (4*) LEVEL

F

IN z<

M(j

• 250 MeV

S= ill fPx

•••.. * 500 MeV •L"V

i *

1 a

a — a

“ a "

X - l

1

I

E

I—

1..J. ..1. .1.1 1 1

i 1 i i i i 1 ' i i i 1 i i i i

1.5 2.0

q ( f m“ * ) -

2.5 3.0

FIG. 11. Experimental form factor of the 6.00-MeV

(4*) levei in 24 Mg.

form N3S-418

(R EV. 7-1 4-941 USC OMM-DC 29010-P94 PH0T0NUCLEAR DATA SHEET 334

U.S. DEPARTMENTOF COMMERCE

NATIONAL 0UREAUOP STANDARDS

1

1

1K

1

R.R. Whitney, I. Sick, J.R. Ficenec, R.D. Kephart,

W. P. Trower

Phya. Rev. C9, 2230 (1974)

METHOD

and

EL CM. STM.

Mg

REF. NO.

A

24

74 Wh 3

12

bang

reaction RESULT

EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E.E/ ABX 0-300 D 500 MAG-D 60

See further analysis of this data in reference 79Zil qOASinJVSTiC _SCAT

E' (MeV)

FIG. 1. The measured quasielastic peaks; the errors on the data points do not include an over-all 3% normalization

uncertainty. The solid curve is a fit by the Fermi-gas model which yielded kF

(in MeV/c) and F (in MeV) as follows:

(a) «Li (169, 17); (b)

12 C (221, 25); (c)2<l Mg (235, 32); (d)

' 5 Ca (249, 33); (e) M - 7 Xi (260, 36); (f) 83Y (254, 39); (g) Il,-I Sm (260, 42); (h) la, Ta (265, 42); (i) 208 Pb (265, 44). The fitting uncertainty in is ± 5 MeV/c and in F it is ±3

MeV. The small-amplitude dashed curve is the s-wave "-production contribution, the dot-dashed curve is the isobar

excitation, and the iarge-ampiitude dashed curve is the total result.

FORM N3S-4I8

.P EV. 7.1 4*64) J5COMM.DC 26010- P64

(over)

PHOTONUCLEAR DATA SHEET 335

U.S. DEPARTMENT COwMEPCi

NATIONAL BUREAU Or STAN CARDS
TABI.K

1.

l’rolon-norni.ilizod

and

radiativc-rorrcctcil

cross

sections

cl 2

o/dQdE'

=

(N±AN)x

10

_n

In

mb/sr

MeV,

for E

=

500

McV

and 0

=60°.

P. *

Cfl ~ <

© O © O m © © © © © © © © © © © © © © lA lf> © © © © lA O O O lO LO ©

cn cn o co -r 05 n o co « n n ^ ^ © © <-' h co t* oj o h cn © •<*• e- oo o «- 3 c- r-« -h h in w n n n n n eo en eo eo n eg eg eg eo co eo co co co co rr -g* o o o’ o* o’ o o’ o* o' o’ o’ o’ o’ o’ o’ o’ o’ o’ o* o’ o’ o* o’ o’ o’ o' o’ o* o* o’ o’ o*

r-) t-4 r-4 . — . T^-^C-O iflcOOHN.COCOH.tON, C3 O CO H . COOOCOOr-f ©

o 00 CO CO . O eg CO . C- CO UO O C4 CO H (9 . 00 to 00 . o 04 . C> CO C-* © . CO TJ* flj CO N rH 04

6

-’ «' H* CJ ' N CO CO '

TJ« Ifl CO C- C-C-COCOCO ’ CO 00 C» * C-O IO O lO UO ' lO lO lO ifl (O ©

to © UO © IO U) IO 10 10(0 10 IfllOlOlOlOlOlOlOLO IA (O IO IO to (O IO (O (O (O IO lO ©

r» 00 O r-t tJ« O © 00 O C- LTOCOHClOOfl5CD CO M CO ^ O CO O O O O t> CO

to o i-» *-« i-< r-c h eg eg eg eg eg eg co eo eo eo eg eg eg eg eg eg eg eg eg eg co co co co co o’ o* o o’ o’ o’ o’ o’ o’ o’ o’ o’ o’ o’ o’ o* o* o’ o* o’ o’ o’ © o’ o* o* o* o’ o* o’ o’ o’ o’ fljO'fO . t-rttf . ncocico ooe*t>eg»-* 0 'g*co.i-t»H. cocgcgeg . e-eOLOt-egco o h w c* . c* t h . ^ 05 co in n n co ^ ci ia ia ^ oi . (Oh, co © eg o . © co eo lo -g* © co o' r-4 r-t* f-» * eg co* co* * ^ g* © o’ to o’ o t- t> e-' e- e»’ to • to’ to* ‘ w o g* g* id to in o loo © lo © © © lo © © © © © © © lo © lo © © © ©©©©© ©©©©©© in © © a h n ^ co o aooci— cO’-'hoococ'-c-o innoococoaiooNcg O O O O f—t r-t r-l f-4 r-H i—• «~* eg eg N, H, H, H H H H t^HCgCgegCg eg © o o’ © © © © o © o © o’ o o o’ o’ o’ o’ o' o* o’ o’ o o* o’ o’ o* © o’ © o* o’ o’ o*

. eg *i-o co. . o e» co © © © ©coco-g*©cge-cgcocO'g«egco g«©©eg-g‘c~©egco©^i* co

. co.coao- . eg e-cog« ©eg © ao ao eo o eg co © ao © eo co © e-m^c^oaoooc^cgeg o*

’ co ' h r* ’ eg eg eg co co rr co’ co eo eg eg eg eg' co eg co co' co* o o lololo LOLOinmuotn LOinminmininmininininLO ©©©olo©©©lo©© in

e- LOLOLO t- 03 a H w O >?OC30lOC-!AOU3rJ<^CON NCOCO^tO-ft-mot'CO o

rr CO OOO O O O >-« *-* *—• r-«r— ti—*r— I—I r-4 r-* i—»»-«r-trHrHr-tr-»rHi—t eg

o' o’ o’ o o' © o’ o* o’ o’ o’ o' o’ o’ o' © o’ o’ o* o’ o' o o’ o’ o’ o’ o’ © o* o’ o’ o’ o’ o’ o’ o’

L0 CO • C' n C3 • O .-h —• CO © -e1 -*HMrfHnMCOCO^P3 C«H NOrfMOt-Tf-fOCOH l>

co o . © © eo . © ^ n x o n -g* © © © ^ eg © o t- co -r eg o o o co © eg eg eg co in eli li

1 « h i- ' h eg n eo « n ceci^'i’^f-rfcioocio cocgeg-Mr—cgegegcgcgcg eg © © © © lo ©©©m©© © © © © © © © © © © uo uo © ©©©©©©©©©©© ©

eo eo i—t>© © e- oo © ao © cn o ^ o Hnno^eiciBB e-oc^cococo©©©© —< m

C3 ce — — O O O O r-l O O O — i—tfHf—»r-«»-^oooo oooooo©©-. — — —

o’ o’ o’ o' o’ o' o’ © o’ o' o’ o o' o’ o’ o’ o' o’ o’ o' o o' o’ o’ o odd d d o' d o’ d d d

oeo. o eg eg . © o -g* ao © © cg — M©oo©cgcoao©ococ- o eg o — © e- © — © —• co © © — . ooo . - rf ui f- o e? cg©c—©©©c~T?< »e«c-re^io© co f- © r: r: m r: r. n “ - ©

co r- C'- © — * — — —• m co ei ei n ?i :i n n’ n n n m fi - — — — — — —

© • r. —

.

© © © ©

c- e- © ©

o o o o o o o o

© © © ©

© c- © e- o o o o

o o o o

o © © ©

OOO©

o o —« ©

o’ o’ o’ o’

o o © ©

o o o o o ©

o o o o o o

© © © © ©

o o © © ©©©©©©© o o o o o o o o o o

if ^ 1 -5 <3 ! d o’ d o'

o © o o

m eg eg o’ o’ o’

eg eg o d o’ o’ ooooooooo o o o o o o o o o o

r-< — r- ^ © © OOO© © © © © © o ©OOO o o o o o o o OOO© o © o o © oooo ocooooooo o o o o o o o o o o

eg © ©

— eg’ eg

c— l» — cs

eg -r © © oooo©© • — eg eg c» eg eg eg eg eg co

i: 2 -3

I

i- t- o co' o’ o' d© © © © © © © © © ooooooooo

© © © © oooo

©oooo o

o o o o o o

eg eg © - - e e g e ce n n ooooo — oegOego©Tr©o ^-^-©oococo—'©oocco ©©coco©g«oc'-co©o o^o — o-rorro — o-rrr-ro xjoooo©©^ — egegeg—ioo

-T’Crr — — - ei'ri'cev-eeT

— © rr © o © © © © o © © o ©oe^oo©Trcgc'je'j-^oo ©©ooooooooo 05cot'c3ce©ertcgrt0

ej :i n ei eg eg eg eg eg ei eg

336

*

m

m

m

m
"EF. U. E. P. Berg, K. Wienhard, H. Wolf

Phys. Rev. Cll, 1851 (1975)

ELEM. SYM.

Mg 24 12

REF. NO.

75 Be 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

LFT 9- 11 C 29 SCD-D 125

(9.83-10.73) (28.7)

TABLE n. Integrated scattering cross sections 1 1 and derived y-decay widths. 9. 827 ,9.965,10.7 31 LEVELS

Titze 1 Fagg b This work

Transition lr®

r rr r°

7 riL y (Energy in MeV) (eV) (eV) (eV) (eV) (MeV mb)

10.71 — g.s. 15.9±2.4 17.6!|; q

5 17.84;1 A-*°-0.44 10.71 — 1.38 4-2:1; 1 o-334:li 9.97— g.s. 4.50 ±0.73 6-22:1:1 o.48 4:11 9.97— 1.38 2 =

7.611:5 2.84:1 °.224:»

9.83 — g.s. 1.05 ±0.26 i.74:? 0-164: ol 9.83— 1.38 o.54:f 0.04 54; ofs

1 Reference 2.

b Reference 3.

2^0. Titze,

L.W. Fagg

Z. Phys,

et al .

,

. 220, 66

Phys . Rev

(1969)

. Cl, 1137 (1970)

form N3Si R E V . 7-14- 418

64) use OMM-N es-oc PHOTONUCLEAR DATA SHEET 337

U.S. DEPARTMENT OF COMMERCE

NATIONAL. 9'JREAU OF STANDARDS

METHOD

E. Kuhlmann, E. Ventura, J. R. Calarco,

S . S . Hanna

Phys. Rev. Cll , 1525 (1975)

D. G. Mavis, EL EM. SYM.

Mg 24 12

75 Ku 4 hmg

REACTION RESUL T excitation ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE A,G ABX 11- 26 D 3- 20 NAI-D DST

SEE ANALYSIS 79KU5

E« in M

Mq(M«V)

FIG. 2. Top: excitation function at 9= 130“ for the reaction 20 Xefa, y^Mg. The arrows indicate energies

at which angular distributions were studied. Middle:

the extracted 51 and £ 2 total cross sections for the

(a, y 0

) reaction. Bottom: the 52 phase 6. relative to the 51 phase, which is arbitrarily set to zero.

FIG. 4. (a) the extracted total 52 cross section converted by detailed balance to that for the reaction

24 Mg(y, Q 0

) 20 Ne. (b) the 130’ excitation function (£1 + 52)

for 24 Mgfy, a jl^Ne. (c) the excitation function at 9 = 9C° for 24 Mg(y,/>0

) 2:! Na obtained by detailed balance from

23 Na(p, yo)

24 Mg (Ref. 14).

form N3S-418 REV. 7-14-64) USC OMM-N 3S-OC

(over)

PHOTONUCLEAR DATA SHEET 338

u.s. department of commerce

NATIONAL BUREAU C F STANOAROS
FIG. 3. Typical angular distributions for the reaction wNe(o, yc

) 24 Mg. Note the almost pure £1 character of the distributions at £a = 5.00 and 11.90 MeV in marked

contrast to the predominantly £2 character at 4.20 and

13.00 MeV. The solid lines are fits in terms of Eq. (3).

_ TABLE I. The averaged absolute cross sections

cr (or.

V

q) for the reactions 20 Ne(a,y)24 Mz and 22 Ne(a,y) 25 Mg.

“Nela.ypMg 22 Ne(a,y) 2? Mg

5(a.yo)

a 5

: (0-,y l

) b ?(a, yo)* 5(a,y,)l> (MeV) (fib) (fib) (fib) (fib)

11.4-14.4 3.2 3.9 • • • 14.4-17.8 3.1 , 4.8 9.2 8.6 17.8-20.2 3.6 9.6 3.0 4.5 20.2-23.8 0.6 1.8 0.9 2.8 23.3-26.0 0.4 0.6 ... ...

3 Angular distribution assumed to be of the form

H'(e) = sin2

fl. h Angular distribution assumed to be isotropic.

TABLE n. Summary of £2 strengths in 24,26 .\Ig(y, a0

) (see text) given in percent of the £2

sum rule f Eq. (5)1.

A£ fa(E2)/E*dE A E J

o

c"

t (E2)/E-dE

Nucleus (MeV) (7c) (MeV) (%)

24 Mg 12.0-22.5 11. 8± 1.0 0-22.5 120±30

26 Mg 15.0-21.4 6.0± 2.0 0-21.4 290± 80

TABLE III. A comparison of the integrated £1 strengths found in various reactions in the GDR’s of 24 Mg and :s Mg. The strengths are given in percent of the £1 sum rule ( Eq. (4)].

(y, a) (y,?0)* (y,n) b (e,e’) c

f<r(El)dE A£ fa(El)dE A£ /c(£l)d£ A£ /a(£l)d£

Nucleus (MeV) (%) (MeV) (7c) (MeV) (%) (MeV) (7c)

2, Mg 14.6-20.6 0.33 15.5—23.0 3.3 16.5-28.0 14.0 16.0-22.0 30.0

26 Mg 14.9-21.0 0.70 ... • • • 11.0-23.0 58.0 14.5-28.0 48.0

3 Reference 14. c References 19 and 27.

b Reference 15.

14 R.C. Bearse et al., Nucl. Phys. A116 , 682 (1968).

1 J S.C. Fultz et al. , Phys. Rev. 04, 149 (1971) . 19 0 . Titze at al . , Phys. Lett. 24B, 169 (1967) ; A. Goldmann,

Z. Phys. 234, 144 (1970)

.

27

0. Titze et al .

,

Phys. Lett. 31B, 565 (1970) .

339
REF.

METHOD

K. Bangert, U.E.P. Berg, G. Junghans,

H. Wolf

Nucl. Phys. A261 , 149 (1976)

R„ Stock, K. Wienhard EL EM. SYM.

Mg 24 12

76 Ba 2 egf

EXCITATION SOURCE DETECTOR

REACTION RESUL T ENERGY TYPE RANGE TYPE RANGE ANGLE

r.

r P SPC 13- 30 C 18- 30 TEL-D 90

G.PG ABY 12- 30 c 18- 30 SCD-D 125

G,NG ABY 17- 30 c 18- 30 SCD-D 125

G, A ABX 18- 22 c 30 TEL-D 90

Fig. 2. The 24 Mg(y, a) differential cross sec- tion obtained from the 30.0 MeV a-particie spectrum.

Table 1 Structures in the J4 Mg(y, p) spectra •) Run (MeV) 13 19.5 21

Peaks at 2.63 2.76 2.82 (MeV) 3.00 2.92 3.03

3.83 3.78 4.26 4.18 4.07

4.63 4.65 4.80

5.06 5.11 5.35 5.43 5.55 5.58 5.66

5.76

6.32 6.26

6.S4

23 30

2.8 2.92 3.02

3.88 3.96

4.10 4.20

4.75 4.73

5.13

5.8 5.73 5.96

6.43 6.42

6.86 6.80

7.06 7.03

7.70 7.66

7.98 7.95

8.4 8.4

8.7 8.6

8.9 8.9 10.4 10.6

10.9

12.5

*) Peak energies are corrected for energy loss in the target and for recoil energy, assuming direct

{y, p) reactions.

(over)

form N3S-418

(REV. 7-1 4-54) USC OMM-N 3 S-O C PH0T0NUCLEAR DATA SHEET 340

U.S. OEP ARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANOAROS
Table 2

Results of the J4 Mg(y, xy') experiment, giving the “bremsstrahlung-weighted” integrated cross sec- tions in MeV • mb for the population of excited residual nuclear states

Bremsstrahlung endpoint energy (MeV)

18.0 19.5 21.0 23.0 30.5

(a) 23Na states

g-s. I

+ *) 0.67 1.02 1.52 2.07 2.59 440 keV, i* 7 7 7 ? ? 2076 keV, }

+ <1.25 <2.24 <2.74 <5.49 <8.90

2391 keV, J

+ 0.99 2.73 4.68 7.45 10.56 2640 keV, 0.80 1.41 Z27 4.52 8.02 2704 keV, J + <1.25 <2.80

2982 keV, 0.85 1.77 3.13 5.73 3678 keV, }“ 0.65 1.34 2.72 4.44 3848 keV, $- 0.82 2.03 3915 keV, J

+ 0.57 0.94 2.27 6.27 4432 keV, 0.94 1.78 3.22 6.53 5380 keV, (}, $)

+ 0.7 1.31 1.89 5967 keV, (}, })- 0.3 0.51 1.81 <3.5

(b) 13Mg states

g-s. i

+ 7 7 7 ? 7 451 keV, i* 7 7 ? ? ? 2051 keV, i* 0.85 2359 keV, 1.46 2.13 2715 keV, f

+ <1.18 <1.79

2771 keV, J" 0.93 3.05 4356 keV, J

+ 0.3 0.55

(c) 22 We states 1275 keV, 2* 1.17

(d) 20We states 1634 keV, 2* <1.25 <2.24 <2.74 <5.49 <8.9 Sum of observed

(y, p) excited

states cross

sections 1.79 7.18 13.99 28.50 51.77 Sum of observed

(y, n) excited

states cross

sections 3.87 8.37 Total (y, n)

yield “) 0.57 3.16 6.91 11.97 21.41 Total photoabsorption yield ') 7.46 16.23 32.42 52.62 104.55

The bremsstrahlung spectra are normalized at 10.71 MeV.

*) Calculated from the data of ref. 14

). 6

) Calculated from the data of ref. J).

e

) Calculated from the data of ref. 12).

2 S.C. Fultz et al., Phys. Rev. C£, 149 (1971); R. A. Alvarez et al.,

Phys. Rev. C4_, 1673 (1971) . 14

R.C. Bearse et al., Nucl. Phys. A116, 682 (1968).

22

B.S. Dolbilkin et al.. Bull. Acad. Sci. USSR 30, 354 (1966.

341
ref. H. Zarek, B. 0. Pich, T. E. Drake, D. J. Rowe, W. Bertozzi

,

c unWe11, A * Hirsch * M - v - Hynes, S. Kowalski, B. Norum,

F, N. Rad, C. P. Sargent, C. F. Williamson and R. A. Lindgren

Phys. Rev, Lett. 38, 750 (1977)

eLEM. SYM.

Mg 24 1A.

METHOD REF. NO.

77 Za 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE E,E/ FMF 15 D 108-260 MAG-D nsT

The unique high-resolution and high-energy features of the electron-scattering facility 15.045 MeV

at the MIT—Bates Accelerator were used to locate a dominant narrow resonance at 15.045 ±0.035 MeV in 24 Mg. A spin-parity assignment of 6* and an isospin T =1 assignment were made. The Af6 form factor was measured and compared to the prediction of a

theoretical calculation which uses the open-shell random-phase approximation on a

shell-model ground state for 24Mg.

FIG. 3. The form factor Lf*6

(‘7)I 2 for the 6', T=1 reso- nance at 15.045± 0.035 MeV in 24 Mg. The open-shell

random-phase approximation calculation for A/6 is shown as a solid line. An A/5 curve (see text) is added

for comparison purposes.

FORM N3S-41S

(R EV. 7-1 4-641 USC OMM-N ftS*0 C

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTGNUCLEAR DATa SHEET 342

, eF . L.K. Fifield, M.J. Hurst, T.J.M. Symons, F. Watt, C.H. Ziiranerman,

and K.W. Allen

Nuclear Physics A3Q9 , 77 (1978)

ELEM. SYM.

Mg 24 12

method

78 Fi 6 hg

EXCITATION SOURCE OETECTOR

REACTION RESULT ANGLE energy Type range TYPE RANGE

A,G LFT 12-15 C 3-6 SCD-D DST

(12.00-14.15) (3.05-5.8)

8 LEVELS STUDIED

Abstract: The 20 Ne(a, y)

2,4 Mg reaction has been used to measure radiative decay rates for known high

spin levels at 12.86(6*'), 13.44(6*) and 14.15(8*) MeV in 21 Mg, and for previously unidentified

levels at 12.00, 13.04 and 14.08 MeV. Gamma-ray angular distributions indicate that the 12.00 and

14.08 MeV levels are probably 6* levels, while the 13.04 MeV level is the lowest 0* T = 1 state. A

new level at 11.005 MeV, populated in the radiative decay of the 14.08 MeV level, is most likely the lowest 5* T = 1 state in 24 Mg. Alpha-particle widths have also been measured for several of

these levels and for the known 6* level at 13.85 MeV using the 20Ne(a, i'y) 20 Ne reaction and

previously determined branching ratios. The results for both radiative and particle decay widths are compared with recent shell-model calculations performed within a full (sd)

8 basis. NUCLEAR REACTIONS 20Ne((i. y), 20 Ne(a, a'y), E = 3. 0-6.0 MeV; measured a(Ex, E,,9 ). E

21 Mg deduced levels, J. n, T, y-ray branching ratios, radiative widths, a-particle widths. Windowless gas target.

FOAM N3S-418

(R EV. 7-1 *-«ai USC OMM-N BS-0 C

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 343
Groundstale

transitions

Transitions

to

1.63

MeV

state

X

X

X

«o vo

—

ri (N

— o o o o

+1 -H -H -H © © © ©

+i +i +m

»o ©v © d

© v">

-i «oo o o o V xxx

u. ! S d 'Or*, j O O — ^ -H -H -H . . so o v O — ro O A ° <N D O ^ H -hi n r-j o ^ ° A 0 O A O vo — — ^ +1 -H -H +1 * *T vo O O n n n n *t

|-a I ©

©©© ! '** ! X X X X ^ j T —. vO «o <^4 • | n » n n

h 00 o

ri fN

m

© ^ ^ J — «0 '-’“I — x o - - v

-H -ft -H o VO o ^ A SC wO

©

©—

_ood TT NO— r*’ v v i V V

NO

— VO

oo (N - —• r-> T eu

Cl • = QC

© ^ ^ ^

-3 <C g .s“ 2 ii o

UJ . _ E 5 o M d e a - o W

—

C3 03

OX) J2 s >

1) Si

«- «C W tz •C T3 £

-d ^ £

TZ

O f

-S

CJ-wo— “O 11

.3 oo

CO >

>» 3

J3 -O&= "2 >* S.O 2 ^ —^ -*r avj y^ 2 ~ 2 « £ c ^ d — c <=> O 4-1

0X) o\v 3 £oo c.- o o - ’5o 2 ~ H « r: = § d C 2 E « P 30 q 0; 1)

=0 tJ C cj & E

^3

O 2 3J w = -° — •Ml

—• o j- ^ o

rW r* o — § -o

j£ .2

iTM o 3 o

10

— S § - 3 Ci

—£

C/T

l— V- o o s o - £

CO . — W £ * d T3 w w CO C 3 ^ U o o v, “

£' i § 1

ill- - 'j ^ j: ' J 5 ? c ii d , 3

"2

03

W

J

“O <— cn W n >d

l> Z * *

5- 2

“a

— <o

?3

— > d < £

S3 ^ o u

cn

n Z O

Q.U » ^ O == o £ “ ^ r 3 i5o

4J

O : £ ~- 2 "3 t?- - *H o vo c oo

•j o « II </> , c —. * 3 ^ - e w E a

“oil wS w= 15 w P-c2 3 O = U

c: c

v. •— S ^ ^ r*

vd • d

_

u. o d —

a.

y

cn

O ° O W E d

-a

w c > d 3 2mNC 2 S

OO

c/)

JH ^ »-is

— 03 00i> ^ 1>

fiSw«2 iSJi V ..

— •= 0 D ai

C c

.3d 1 « ^ C d o

00 3 J=U4J

w <5 <> W 3 JD ^

T3 E j= = " 3 ^ ^ O ^ ^ + <J *T3 W — W -3 3 5 H

HZ 3 in

a o d

—

Q.

w . > a o £ > — U

•s s d c

cj

Cn|

<uu.w

J3

W m—m • 3 w ^r

cj2 ^ w J3

</j

—

c: oi

x> ^ 1) 3> — 3 W

LO

C\J CM

OO

CDr—

C\J CMm

CD8

to>s -E

O. >

<D cc -a sat • -E - in in io >»••” 3

-E i— (B CL J3 V) 3 ia - a. e

-e at

+-> at t— 3 .a

u. c l. ii ra

O h-

•2

Wo o c. f3 -M

“O “*3 — - 

CJ 3 CQ #k c

75 S d L ^ *a ra 3 •js • ra W

CO T3 Q- aj +J

d s o

CL

w

CO3 O

JZ

a)

i-<D

CO

U Q.3 W *n

4-> •f— -Q E -E ra to 3 3:

r— Ct; C_3 _E . . C3 CC LU e -a » 3 E ra

tvi ro s • +J S_ 3• +J <ra Q£ 3 <

a< - I— ra

at « i-

•r- E 3 <*- — E •r- > -fLi. I— JE

at

u • L«i i—I

—ia 2: I I I I— CM

CTS r— CM

at oj ai a: oc cc

mm

344

m
ref. K. Masumoto, T. Kato, N. Suzuki

Nucl . Inst. Meth. 157, 567 (1978)

ELEM. SYM.

Mg 24 12

methoo REF. NO.

78 Ma 10 hg

REACTION result excitation ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,PN ABY 26-68 C 30-68 ACT -I 4PI

Analysis is made of reactions interfering with

photon activation analysis procedures.

The activation yield curves have been presented for a number of photonuclear reactions in .he energy range from 30 to 68 MeV, in order to evaluate quantitatively the interferences due to competing reactions in multielement photon activation

analysis. The general features of the yields as functions of both target mass number and excitation energy were elucidated from the data obtained, discussion being given on the results in terms of the reaction mechanism.

Simultaneous neutron activation due to appreciable neutron production from the converter and surrounding materials has also been studied, and. finally, the magnitudes of interferences in real multielement analysis were given in the form

of their energy dependences.

XJ.U I 1 I J-.L l-ljJ 10 ' 10 : Nr

Fig. 2. Yield per equivalent quanta versus target neutron number.

Fig. 3. Activation yield curves for the reactions on C. Na. Mg

and Al. r

1 -C(y. n

)

1

1

C. B

IJ C(;\ art) Be. A

- 3 Na(y. n) :: Na. O

- 5 Mgl y. pi

:i Na. ® - 4 Mg ; . pni-- Na. A

:1 All y. tm) :; Na. 7

:: AI- : -Na

(over)
£

max (

M

*V )

Target mass number

Fig. 11. Yields of the (y, pn) reactions as a function of bremsstrahlung maximum energy and target mass number. The

numerical values in the figuie are yields per equivalent quanta

in mb.

4 Z

Fig. 12. The reaction yields leading to : -Na as difference in atomic number between target and

elides.

function of

product nu346
REF - A.M. Sandorfi and A.M. Nathan

Phys. Rev. Lett. 40, 1252 (1978)

ELEM. SYM.

Mg (N

< Z

12

METHOD REF. NO.

78 Sa 3 rs

REACTION RESULT EXCITATION ENERGY

SOURCE 0ETECTO R ANGLE

TYPE RANGE TYPE RANGE C12,G ABX 18- 28 D 4- 14 NAI-D 45°

The yield curves of high-energy capture y rays from l2 C(12 C,y0

) and 12C(12 C,yt) were measured at 0^, = 45* from Ec . m. = 5.0 to 11.0 MeV. A J* = 2* resonance, with a width

(full width at half-maximum) of 261* 74 keV and a peak cross section at 45“ of 44.3* 4.5 nb/sr, was observed in 12 C(l2C,y0

) at (21.98*0.03) MeV excitation in 2 *Mg. Several

other resonant features were also observed in the ' -ray yields.

I05CHANNEL NQ

26 ENERGY MeV

FIG. 1. The high-energy portion of the y-ray spectra, taken at incident beam energies of 15.70, 15.98,

16.25, and 16.30 MeV with a 230-keV- (c.m.) thick target, are shown here. The spectra are labeled with

the Doppler-shift-corrected excitation energies at the middle of the target and have been shifted linearly

in channel number to compensate for the differences

in energy. As displayed, all share a common energy

scale with the data at 21.81 MeV excitation. The position of the centroids of y0 , ylf and y2i3 are indicated. The variations of the Doppler shifts and of the peak

widths are negligible for these spectra. The intensities of the high-energy y-ray lines may thus be compared directly. The solid curves are three-peak fits

to the data points (see text).

C.M ENERGY (MeV ) IN 5.07 6.07 7.07 8.07

12C9.07

12 C SYSTEM

10.07 h.07

50 -

40

30

20

I 0

1

°

fcle

°l ^ 50

40

30

20

- +.+

,

i 1

l2C(' 2C,

yi

) 24Mg

i T 6y

AB

--4 5°

r il [ ? T , r 1 I ^ l L

T

| }

|

l2C(l2C.y

0

) 24Mg _

IT*

i

ay

AB

= 4 5°

'o

T

‘ l j T 1

T~

19 20 21 22 EXCITATION ENERGY IN23

24.

347

24 25 ’Mg ( MeV ) FIG. 2. The solid points on the excitation functions shown here were taken with a 74-pg/cm: 12 C(99.97o) target. The dashed data points were collected with a 280-*ig/cm2 natural carbon foil. The horizontal bars

indicate the target thickness. The solid curve is a fit to the data assuming a single Breit-Wigner resonance

(see text)

.

tRCE

XROS
gP

111 . PP
A.M. Sandorfi, L.R. Kilius, H.W. Lee, and A.E. Litherland

Phys. Rev. Lett. 40, 1248 (1978)

METHOD

EL EM. SYM.

Mg 24 12

78 Sa 4 rs

REACTION RESULT excitation ENERGY

SOURCE DETECTOR

ANGLE

TYPE RAN GE TYPE RANGE

E,F ABX 20- 28 D 21-32 TRK-D DST

We report the electron-induced fission of 24 Mg into two ground-state aC nuclei following monopole excitation at energies between 20 and 22 MeV. The observed cross section exhausts at least (8±2)% of the linear energy-weighted monopole sum rule S( E0) and may

form a part of the giant monopole resonance. In addition, we have observed a peak in the 9 i 2 C

= 45“ excitation function between 22.0 and 23.5 MeV with a width (full width at half-maximum) < 1 MeV and a

12 C angular distribution, sin2 (20 c>m> ), indicating J*= 2*.

FIG. 1. Differential electrofission cross sections are shown here. The solid curve follows a form calculated assuming F2 excitation [Ref. 6, Eq. (14)1. The

dashed and dotted curves are fits to the data assuming

the quadratic energy dependence characteristic of “Coulomb” excitation (see text)

.

4c' (deg)

FIG. 2. The equivalent photofission cross section

(bottom) was deduced from the data points on the solid curve of Fig. 1. The points shown here result from

integrals over the regions of excitation energy denoted by the horizontal bars. Below 21 MeV, the cross sections are uncertain within a factor of 2, in addition to the errors shown 'see text). The dashed curve is merely a guide to the eye. The !2 C angular distribution

(top) indicates a ]* = 2‘ assignment to the peak centered

at 22.7 MeV (bottom)

.

°G. Bishop, in "Nuclear Structure and Electromagnetic

Interactions, Scottish Universities Summer School,

Edinburgh, Scotland, 1964," edited by N. MacDonald

(Oliver and Boyd, Edinburgh, Scotland, 1964). over

FORM NSS-418

(REV. 7-14-64) USC OMM-N BS-DC PHOTONUCLEAR DATA SHEET 348

U.S. DEPARTMENTOF COMMERCE

NATIONAL BUREAU OF STANDARDS
24Mg (e,l2 c)

90*- 7a24Mg(e,l2 c) + 24 Mg{y,l2 c)

9°*r- ^ 135* 24Ua

- -5?, *

k e — 90* ^ 45*

v G0LD

RA0IAT0R

''* 45* ~90'

FIG. 3. The inability to excite 0* states with real photons was utilized, in the experiment shown here

schematically, to verify the association of the 90* yield

of Fig. 1 with monopole excitation <see text and Table D.

TABLE I.

12 C production cross sections (nb/ sr) with and without a photon converter. This data has not been

corrected for ls O(e/y, l2 C) (10% of the yield at this elec- tron energy). E i 2 C ^ 3.5 MeV.

0 ( 12 c) 45* 90* 135° 1

Radiator out 2.0 ±0.2 0.6 ±0.1 0.4 ±0.1

Radiator in 4.1 ±0.3 0.8 ±0.1 1.1 ±0.2

a The lSS’ and 45° data differ because they are presented for a fixed detector development time (see Ref. 2). This results in an angle-dependent detector

efficiency due to the varying kinematic shifts between

laboratory and center-of-mass frames. This dependence was removed from the angular distribution measurements of Fig. 2 (see text).

^R. Fleischer, P. Price and R. Walker, "Nuclear Tracks

in Solids (Univ. of California Press, Berkeley,

1975), pp. 136-137.

349
REF.

METHOD

K. Zarek, S. Yen, B.O. Pich,

Kowalski, C.P. Sargent,

M. Karvey and H.C. Lee

Phys. Lett. 8 OB , 26 (1978)

T.E.- Drake, C.F. Williamson, s W. Chung, B.H. Wildenthal,

Mg

REF. NO.

24 12

78 Za 2 rs

REACTION RESUL T EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE E,E/ FMF 4 D 1* 2 MAG-D DST

The high-resolution electron scattering facility at the MIT-Bates accelerator was used to resolve the 4^ 4.12 MeV and

2j 4.24 MeV levels in

" 4 Mg. The respective E2 and E4 Coulomb form factors were measured and compared to form factors calculated theoretically; the 4 . form factor exhibits a momentum-transfer dependence which strongly suggests that K is a

24 good quantum number in Mg.

.8*2.2 FM-1 ,SEE 81 ZAl

Fig. 2. The form factor for the 4| 4.12 MeV level of

24 Mg is on the left, and for the 4.24 MeV level on the right. The Fermidensity form factors are shown as a solid line, shell-model form factors as a dashed line and the PHF form factors as a dash -dot

line.

over

po rm N3S-4 18 'REV. 7 - t 4*64i use OMM-N as-o c PHOTONUCLEAR DATA SHEET 350

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Table 1 Parameters for Fermi transition charge densities to the 2 and

4* K = 0 and 2 states in 24 Mg.

/

c(fm) r(fm) fl(EXt)

2; 2.77 235 453 ± 35 e

2 fm4

25 2.77 2.35 27.4 ±3.0 e

2 fm4

4; 3.625 1.85 (2.0 ± 0.3) X 10

3 e2 fm8

4j 2.725 1.91 (43 ± 0.6) X 104

e

2 fm8

351
K. Sh. Egiyan

Yad. Fiz. 30, 890 (1979)

Sov. J. Nucl . Phys. 30, 461 (1979)

ELEM. SYM.

Mg 24 12

REF. NO.

ref.

METHOD

79 Eg 3 hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,XP RLY 12-250 C 130,250 MAG-D DST

Experimental data are presented on the inclusive photoproduction of protons in the nuclei l:C, J4 Mg, MC“» n ' Sn* !0<Pb irradiated by bremsstrahlung with maximum energies 0.13 and 0.25 GeV. The

regions of angles 30-90* and of photoproton momenta 0.24-0.48 GeV/c were studied. PACS numbers: 25.20. + y

FIG. S. A -dependence of the photoproton yield In reactions (2) and (3). Experimental points for £71B1 = 0.2S GeV: circles—

•

p,= 0.29 GeV/c; triangles —

p

f = 0.34 GeV/c, squares —p,

= 0.40 GeV/c; half-open symbols—for 3, = 30", open symbols — 3, = = 60", solid symbols —,3, = 90", for 4^^,= 0.13 GeV: O—p,

= 0.29 CeV/c, = 30"; —

p

p = 0.34 GeV/c, 3,= 30". Che lines have been drawn through the experimental points by the method

of least squares.

popm N3S-4IU

(a ev. 7-1 a-aai use omm-n as-oc

U.S. DEPARTMENT OF COMMERCE

NATIONAL 8 UREAUOF STANOAROS PHOTQNUCLEAR DATA SHEET 352
—

.
REF V.V. Varlamov, B.S. Ishkhanov, I.M. Kapitonov, Yu. I. V.I. Shvedunov

Yad. Fiz. 30 , 1185 (1979)

Sov. J. Nucl . Phys. 30, 617 (1979)

METHOD

Prokopchuk,

ELEM. SYM. A

Mg

REF. NO.

Z

24 12

79 Va 3 egf

REACTION RESUL T EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,P ABX 11-30 C 17-30 SCD-D 90

Photoproton spectra from “Mg have been measured in a bremsstrahlung beam. The end-point energy was

varied over the range 17-30 MeV with a I-MeV step. From the photoproton spectra we calculated the

distributions of the fraction of transitions to various states of the 23 Na final nucleus and determined the

partial cross sections corresponding to these transitions. The giant resonance of “Mg is broken down into components associated with electric dipole transitions from the \d-2s outer shell and the lp inner shell. An estimate is given of the contribution of lp— l/t configurations. The results are compared with theory. PACS numbers: 25.20. +y

<is/dSH , mb/sr

a. </ -

f 0 2

0<J)r

02 -

,* i.

9.6

.....til,

7.6

L

FIG. 3. Partial cross sections for the reaction Z4 Mg(y, p)n Na

with formation of the final nucleus in groups of states with centers of gravity at 0.4, 2.6, 4.0, and 5.8, 7.6, and 9.6 MeV.

In the lower figure we have also shown the cross section for the (y,p 0

) reaction from Ref. 11.

form N3S-418 REV. 7- 1 4- 64) USC O MM-N 3 S-O C

dO/dSZ

,

mb/sr

i i i i i i i l. IS n 19 Zl 2J ZS 27 29

, MeV

FIG. 4. Sum of the partial cross sections for the reaction ^Mgly.pl^Na.

TABLE HI. The main characteristics of electric dipole transitions which form the giant resonance of :l Mg.

Transitions from

l<J-Zs shelf Transitions irom

lp shell 1 . ! *

C 5 o ry c v <— 2

w _ 2 Z >| 3 - >

l-j ill

11

i

*

-

c “ c

Reference oHI Z ->

c

= z-~- tz -Sans

I?> !t>

f lx

173 5.0 0.47 27.0 4 S 053 0.7

j 2S- IS 100 rl

18.5 6.4 2." « 7 2 n.76 6.9 26-27 ton [ 3

I 22.1 5.8 0.57 21.1 6.3 «». til -0.7 1 25-25 100 IM

21.6 6.8 0.65 23.6 5.1 0.35 2.U

| 10-'l JO Present work

(over)

PHOTONUCLEAR DATA SHEET 353

U.S. CEPARTMENTOF COMMERCE

NATIONAL. BUREAU OP STANDARDS
max = 210 MeV

r ,yBI SCO »,i:> U

503 -

003 '

200-\-L 0 L_

20o\

#L

200

0 L

2C0 -

<7 L_

/fjlI.

25or

0 —

.1 V ' it^l,

/

I

* .Vi "‘V /n

'

ETM’ = J0. J MeV

, Wl At

,/• *

a h

f * J**,V

I I

/• : ;l 4‘.' V

•V

1 sv *\ .

V,\

— .

29 0

V..,. 23.0

, / //

27.0

'•v. 26 0 v 25.0

V*• 20 0

> r

23 0

/ j ; 7 g n tj to n

E„ . MeV

FIG. 1. Phofoproton spectra for £"** = 17-23 MeV' (a) and

£.m« = 23-30 MeV (b).
ref. A.M. Sandorfi, J.R. Calarco, R.E. Rand,

Phys. Rev. Lett. 45, 1615 (1980)

method

H.A. Schwettman EL EM. SYM. A Z

Mg 24 12

REF. NO.

80 Sa 4 hg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,F ABX 13-29 D 26-40 TEL-D 90

FISS PROD COINC

Coincidence measurements of electrodisintegration products have been used to simultaneously study the l2C + t2 C,

15 0+ 8 Be, and 20Ne + a decay channels of 24 Mg. Asymmetric

fission into ls O+ 8 Be, is concentrated between 18 and 28 MeV in 24 Mg ani exhibits resonances '-vita cross sections ten times those of symmetric fission. There is little correlation among resonances in the three decay channels. The fission yields are not consistent with statistical decays from giant resonances, and suggest highly clustered states in 24 Mg.

PACS numbers: 24.30.-v, 24.75.+I, 25.85. Ge

FIG. 3. The 90° cross sections (in nanobarn/steradian per megaelectronvoit excitation) for 24 Mg(e ,/,/,)£' are histogrammed here for the main decay channels of Fig. 1. A vertical bar on each spectrum at E ex = 20.8 MeV indicates the level of statistical uncertainty. The a 0 yield predicted by the data of Ref. 9 is shown as open circles in (c). Peaks that could result from decays to 20 Ne 2 * (1.63 MeV) are Labeled with a

subscript 1. (The energy scale is appropriate to a 0 decays.) The triangle points in (b) are the predictions

of a H-F calculation for the decay of the GDR.

FOBM N3S-418

(REV. 7-I4.UI USC OMM-N 8S*0 C

(over)

U.S. OEPARTMENTOF COMMERCE

NATIONAL. BUREAU O lr 5TANOARCS

PHOTONUCLEAR DATA SHEET 355
e';

o (M.v)

1 .0 20 3.0 4.0 3.0 6.0

FIG. 2. Cross sections (in nanobarn/s te radian per megaelectronvolt of excitation* for :l Mg(e t ls o ’Belt'' are shown in (To) and (c). The angle- integrated spectrum, is shown in (a). The detection efficiency follows

the solid curve in (a) with its scale on the right. A

vertical bar on each spectrum at £ ex = 20.8 MeV indi- cates the level of statistical uncertainty.

356
REF. ELEM. SYM. A Z Y. Cauchois, H. Ben Abdelaziz, R. Khdrouf, C. Schloesing-Moller

J. Phys. G7, 1539 (1981) Mg 24 12

METHOO REF. NO.

81 Ca l hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,G LFT 1 C 0-2 SCD-D

(1 .368)

Abstract. Lifetimes of 49 excited states below 1.65 MeV have been measured in

24 Mg, 27 Al. 1 . 358 MeV

**Ti.

!, Ni.

3, Co. “-“Ni. si43Cu.

44 “- 4*Zn.73 As.,03 Rh. ,l3J,3

In.

,,6' n,' ,:0Sn and l2U23Sb

by means of nuclear resonance fluorescence experiments. The levels are excited by

bremsstrahlung x-ray photons. The self-absorption technique applied to suitable cases provides nuclear absorption cross sections, widths and lifetimes from which the x-ray

spectral distributions are also obtained. Scattering experiments are performed for all other cases in order to obtain widths and lifetimes from these x-ray photon curves. The Compton

effect in the sample is taken into account. Self-absorption provides ^Po from which T is deduced using adopted J* and To/P values; scattering provides u = $X\lE)W{9) from

which P is also deduced with J, Po/T and mixing ratios taken from the literature. Thanks to simultaneous determination of the x-ray spectra all the lifetimes as given by our programs

with their statistical errors form an unusually coherent set of values. NUCLEAR REACTIONS (y. /). bremsstrahlung excitation: natural isotopes:

:4 Mg.

27 AI. **Ti.

!, Ni.

3, Co. 4l ' 42 Ni, 43 ' 43 Cu, 44M-‘, Zn.

1! As.

,03 Rh. u3-" 3 In. ‘“ “'• l20Sn

and l2ll23 Sb: E ~ 0.5-1.65 MeV; measured gTa or gfro/DWTtf): deduced Ti/j.

(OVER)

form N3S-418

(REV. 7-1 4-64) USCOMM-CC 26010-P64 PHOTONUCLEAR DATA SHEET 357

U.S. DEPARTMENT OF COMMERC

NATIONAL. BUREAU OF STANDARD
TaMua 3. Resultats del mesures des niveau* etudies par diffusion.

TaWt 3. Results obtained using the diffusion method.

u=g(ri/rm0) r(ps)

Isotope Energie (ke V) J' JS Eo/r <5 (meV) ce travail rrtf (ps) References!

J *Mg 1368.59(4)

27 Al 1014.45(3)

“Ti 983.512(3)

!, Ni 1454.45(15)

3, Co 1099,224(25) ”Co 1458.8(3)

3, Co 1430.9(3)

s, Ni 1185,7(6)

42 Ni 1 172,91(9)

‘3 Cu 1327.00(7)

4, Cu 1412.05(4) MZn 991.54(7) "Cu 1481,83(5) “Zn 1039,37(6)

4, Zn 1077.38(5)

71 As 572.5(10)

7j As 823,0(10)

73 As 865,5(10)

73 As 1076,0<!0)

73 As 1128,5(10)

73 As 1 349.W 10) 13703X10)

103 Rh 803.1(2) ""Rh 1277,0(2)

ll3 ln 1 177(1)

ll3 In 1510(1)

1 1

3

1 n 1077. 7( 10)

ll3 ln 1290.59(3)

1 l! ln 1448.78(3)

ll3 In 1486.1(1)

l,3 ln 1497.2(4) “3 ln 1607.8(15)

l,4 Sn 1293.54(2)

u, Sn 1229.64(4)

l70 Sn 1 171.6(2)

l2l Sb 1023.5(10)

,!l Sb 1 105.5(10)

l2l Sb 1 142.5(10)

l2l Sb 1384.0(10)

,23 Sb 1029.5(10)

,23 Sb 1086.5(10)

2* 0' I

$* j’ 0.971

2

* 0

* 1 2

* 0

* 1

1- l~ > y- o,9i }- r o.8

]- 0.77(8

)‘ 2* 0* I 1 - j“ 0.84 j- j' 0.72 2’ 0* 1

i !' 0,85 2* 0* 1 2' 0' 1 j- i~ l d

j- j* 0,86

d

1* j- 0,83

d 0,94“

i* J- i

j- }' 0.67 d

J 0.47 d

i j* 0.70

4 \ 0.75 y- f I j' j* 0,935

1

‘ 5* 0.81' V

* ?

* 0.98' r j* 0.86

?• ?* 0.787

(s') V <i

(j*) ?* 4 ! 2

* 0* I 2' 0* I 2' 0* I

2

’ i' 1 !* J* 0.4

?' i' 0.6

3

*

i *

i

E2 1,08(13)

+ 0,351(12) 0,186(13)

E2 0,282(23) E2 2,11(26)

(E2) 0,069(8) (E2) 0,68(8) <0.35* 1.23(15)

|0.14| 1,88(49) E2 0,88(17) (E2) 1,04(14) + o.6ii:l| 0,260(38) E2 0,640(54)

(E2) 1,13(19) E2 0,70(6) E2 0,70(6) 0,39

b 0.236(26) (E2) 0.214(22)

C 0.78(6)

0,3 8

d 1,97(13) El d 0,224(24)

0.20d 1.61(29) 0.47 d 0.64(13) Ml 1.85(16) - 0.ti2(30)

e 0,81(9) + 0.5(2) 9.1(8) -o.5|:i{ 6,4(9) (E2) 0.159(24) (E2) 1.31(11) - 8

r 0.90( 1 1

)

- 0.8

f 0.63(9) (E2) 1.33(16) (E2) 1.54(24) E2 3,58(37) E2 2,75(28) E2 1.83(16)

10.57|* 3.69(34)

0,47(4) (E2) 0.85(8)

!0.45|* 4,7(5) 0.57|* 2.96(27)

|d| > 1.26* 1.06(9)

1,76(21) 1,98(4)

2,20(16) 2.12(8)

6,74(55) 6.1(13) 0,90(11) 0.92(3)

4,79(55) 3,17(58)

1,17(14) 1.52(16) 0.254(31) 0.31(3)

0.21(5) 0.16(3) 2,15(42) 2.09(3) 0.84(11) 0,88(4) 1.90(28) 1.61(3) 2,97(25) 2,60(13) 0.79(13) 0,49(5) 2,71(23) 2.25(15) 2,71(23) 2.34(23) 4,14(46) 3.5(9) 4.27(43) 3.5(3) 0,863(68) 0,60(12) 0,287(19) 0,32(7)

1.47(16) —

0,180(32) 0.12(3) 0.218(44) —

O.I74< 15) —

0.8 7(10) 1.3(9) 0.086(8) 0.10(6) 0,071(10) 0.1 ll’.

4

;! 1.61(24) 1.23(7) 0.66(6) 0.55(4)

0.50(6) 0.5 2( 20) 0.63(9) 0.4(3) <0.30(4) —

4 0.26(4) —

0,53(6) 0.522(14)

0.69(7) 0.67(2)

1,04(9) 0.91(2) 0.228(21) 0.2CX 7)

h

0.42(4) —

0.449(40) 0.41(8)"

0.0921 10) 0.0881 14)

1

0.272(25) 0.26(4)"

0.67(6) 0.72( 15)"

Endt et van der Leun

(1978) Endt ct van der Leun

(1978) Been (1978) Kocher et Auble

(1976) Kim (1976) Kim (1976) Kim (1976) Andreev el al (1974)

Halbert ( 1979a) Auble (1979b) Auble (1979b)

Halbert (1979b) Auble (1975a) Auble (1975b) Lewis (1975) Horen et Lewis (1975) Robinson et al ( 1967)

Celliers el al (1977)

Celliers et al (1977)

Wilson (1970)

Harmatz ( 1979) Manual/. (1979)

Tuttle et ul ( 1976)

Tuttle el ul ( 1976)

Tuttle et al ( 1976)

Tuttle ctaK 1 976)

Tuttle et all 1976)

Tuttle el al ( 1976)

Carlson et al ( 1975) Carlson et al ( 1976) Kocher ( 1976) Tamura et al ( 1979)

Booth et all 1973) Booth et al ( 1973) Booth et al

(

1973)

Booth, et i// ( 1 973)

7 References pour les colonnes 3. 4, 5. 6 et 9 de ehaque ligne, sauf indication appeiec au bas de ce tableau. Pour les autres donnees se reporter au

teste. Remarque. Pour calculer 6

1 quand nous ne dtsposons que de B( E2), pour un melange (E2) + (M1), nous dedutsons i;ro(E2)or Z?(E2)E,

3

; en admettani H'(IM-I et connatssant IV, T. nofc determination de u donne une premiere approximation de efo d’ou une valeur de

<j‘ =<xTo( E2))/(xT.j -gTo(E2)) qui permet d'.tmeliorer ll\U) el t'To de proche en proehe.

1 Swann ( 1971);° Robinson et al ( 1967);

c It (9) = 0.99 calcule d’apres la formule de Celliers et al l 1977). d Abbondanno et all 1 9 "8);

= Saver et a I

( 1972); Tuttle et al (1976); 1 d’apres B( E2) de Barnes et al ( 1966); " calcule d’apres Booth et a

l

( 1973);

1 Williams et al ( 1975); > Dietrich et al

( 1970).

358
REF. K. Itoh, S. Ohsawa, Y. Torizuka, T. Phys. Rev. C23, 945 (1981)

METHOD

Saito, T. Terasawa EL EM. SVM. A

Mg

REF. NO.

Z

24 12

81 It 1 hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE HANOI TYPE RANGE E,E/ ABX 9-34 D 102-200 MAG-D DST

Highly excited muitipole resonances of ! *Mg between 9 and 34 MeV excitation energy have been investigated by

inelastic electron scattering for incident energies in the 102 and 200 MeV range. Prominent giant dipole resonances were observed at 18.9 and 20 MeV excitation energy, with a shape which is very similar to the shape of the photoneutron cross section. Over twenty-five quadrupole and twenty octupole resonances were identified and

separated by means of the multipole expansion method. The giant dipole strength exhausts |85t*,)% of the isovector dipole energy-weighted sum rule. The quadrupole and the octupole strength exhaust (1 17 ±23)% and (115 ±23)% of

the corresponding isoscalar energy-weighted sum rule, respectively. Evidence for the excitation of higher multipole

states such as hexadecapole transitions was also found in the excitation energy region studied.

’NUCLEAR REACTION 2*Mg(e,e'), £ = 102, 125, 150, 200 MeV, ?=0.37-1.3

fm-1

( measured cr{E' , 8) up to 34 MeV la excitation energy; deduced dipole, quadrupole, and octupole strengths In giant resonance region. Enriched targets^ 2

<0 O £ C
TABLE 1. Reduced transition prooauuiues oiui, i) and percentage of the isovector energy-weighted sum

rule St

. The errors are +10%, —20%. The (y,n) data were taken from Ref. 14.

Present (T.n) Ez B (Cl, ») Si Ez Si (MeV) (eHm2

) ft) (MeV) <%)

9.1 0.11 1.1 10.2 0.039 0.44

10.8 0.10 1.2 11.6 0.054 0.71 13.7 0.043 0.67 14.4 0.077 1.2 15.0 0.026 0.45

16.7 0.22 4.2 16.9 0.16

17.1 0.12 2.3 17.3 0.29

17.6 0.015

18.3 0.84 18.9(17.7- 19.5) 0.75 15.9 18.8 1.1 19.2 0.79 20.0(19.5-20.3) 0.33 7.5 20.1 2.0 20.4 0.29 20.3-21.4 0.23 6.5 20.9 1.2 21.4-25.0 0.77 20.0 21.5 0.41 22.4 0.27

23.1 2.0 25.0-28.0 0.39 10.5 25.0 4.2 27.5 3.2 16.5-

16.7 28.0 28.0-31.0 0.22 6.5 31.0-34.0 0.16 5.8 9.0-34.0 3.69 84.9

TABLE III!. B(C 3, t) and percentage of the isoscalar

octupole EWSR S 3

. The errors are ± 10% up to 16.5 MeV, ±25% above 17 MeV. B (C3) for the lowest two

states were taken from previous (e,e') work of Ref.

12. The result of the ( p,p ') was taken from Ref. 9.

Present (P.P’) ez B (C3, t) Sj Ez s3 (MeV) lO2 e^m3 ft) (MeV) (%)

7.62 1.33 5.3 7.616 4.99 8.36 1.90 8.2 8.356 4.26

9.1 0.04 0 J2. 10.3 0.26 1.4 10.9 0.47 2.7 11.157 1.24 11.318 0.31 11.7 0.71 4.3 12.016 0.58 12.4 0.24 1.5 12.261 0.39 12.663 0.39-. 12.850 0.30

0.77 13.344 0.33 13.440 0.60

13.7 0.21 1.5 14.3 0.31 2.3 16.5 0.78 6.6 17.1 0.18 1.6

17.9 0.18 1.7 18.5 0.36 3.5 19.1 0.13 1.3 19.8 0.34 3.5

20.7 0.12 1.3 21.1 0.23 2.5 21.6 0.20 2.2 22.0 0.42 4.8 22.3 0.18 2.1 23.4 0.41 4.9 23.9-25.0 0.26 3.3 25.0-28.0 1.04 9.3 28.0-31.0 0.92 14.1 31.0-34.0 1.51 25.5 0-34.0 12.7 115

TABLE II. TiiC'2, i) and percentage ot the isoscalar quaurupole EWER Si. The errors are =10% up to 15.7 MeV, ±20% above 16 MeV in excitation energy. B(C2, t) for the two lowest

states were taken from the (e,e') work of Ref. 22. The a-parttcle scattering data were taken from Ref. 7. S2 for the a-capture reaction were calculated by Bertrand et al. (Ref. 7) using

the data of Ref. 3. The previous (e,e') data were taken from Ref. 12.

Ez (MeV)

Present B(C 2, t)

(e

2fm4

)

S,

ft)

(a, Ez (MeV)a') s2 ft)

(<*.r0 ) Ex (MeV)

s2 ft)

(e, Ez (MeV)

e') s2 ft)

1.37 446 13.3 1.37 12.4 4.23 22.8 2.1 4.23 2.4 7.34 0.9 0.2 9.38 9.4 1.9 9.30 2.4 10.6 7.6 1.7 11.2 9.7 2.4 11.38 0.6 11.3 6.8 1.8 12.6) 12.52 0.6 12.8

f 20.0 5.6 12.8 3.5 12.8 4.0 12.99 0.6 13.1 ' 13.1 3.6 13.1 2.8 13.9 11.3 3.4 13'. 9 3.0 13.9 0.4 14.7 10.7 3.4 14.5 3.3 14.9 2.5 15.2)

11.0 3.7 15.8 0.6 15.7/

16.6 2.3 16.5 1.1 16.9 7.5 2.7 17.0 5.3 17.3 19.0 7.1 17.4 8.4 17.4 1.2 17.8 3.1 18.2 2.5 18.2 0.5 19.3 6.3 2.6 18.3 4.8 19.1 2.0 19.6 5.2 20.1 10.0 4.3 20.0 2.3 20.0 1.0 20.4 6.8 20.8 2.1 0.9 21.1 (2.7) 21.3 7.8 3.6 21.4 (2.8) 22.4 8.4 4.1 21.7 5.4 22.7-25.0 20.6 ioa 24.0 7.9 25.0-28.0 29.4 17.0 28.0-31.0 28.5 18.3 31.0-34.0 10.0 7.0 0-34.0 705 117

360
«er H. Zarek, S. Yen, B.O. Pich, T.E. Drake, C.F. Williamson, S. Kowalski,

C.P. Sargent, W. Chung, B.H. Wildenthal, M. Harvey, H.C. Lee

Phys. Lett. 104B , 499 (1981)

ELEM. SYM.

Mg 24 12

METHOO REF. NO.

81 Za 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ FMF 4 D 1*2 MAG-D DST

ERRATA FOR 78ZA2

ERRATA

H. Zarek et al.. Electroexcitation and the determination of the /f-band structure in 24 Mg, Phys. Lett. 80B (1978) 26.

On page 27 in table 1, £(E4t) to the 4{ state is (3.8 ± 0.3) X 10 3 e

2 fm8 and not (2.0 ± 0.3) X 10 3

e

2

fm8

.

porm N3S-418

<R EV. 7-1 4-«4l USC OMM»N 8S*0 C PHOTOMUCLEAR DATA SHEET 361

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF" STANDARDS

Mg

A=25

Mg

A=25

'

- Mg

A=25

Ref. R. Nathans, P.F. Yergin

Phys. Rev. 9& , 1296 (1955)

Method bf counters; 24 MeV Bremss Betatron.

5

Reaction

(Y,xn)

E or AE

9- 3*24 20.3

S"

dE

O.O96 MeV-mb

J *

Elem. Sym.

Mg 25

Ref. No.

55 Na 1

12

EGF

Notes 3 20

E = 7.5 MeV; a = 16.5 mb.

th max No corrections.

[NOTE: Figure 2: Ref 8: Katz, Baker, Montalbetti,

Gan. J. Phys. *>1, 250 (1953)

Ref 5: Katz, Haslam, Goldemberg,

Taylor, Can. J. Phys. 32 , 580 (195*0.

Ref 9: Katz and Cameron, Phys. Rev.

84, 1115 (1951).

Ref 10: Toms, Stephens, Phys. Rev.

82, 709 (1951).]

Fig. 2. (y,n) cross section for Mg2i

. The ordinate scale is in millibarns (H)

-” cm2

). The locations of the thresholds for various

reactions are indicated by arrows. The circles are the points calculated from the yield data. The solid curve is drawn to ht tne

points. The three dotted curves are the previously reported Mg^T./ONa24 cross sections (see references 5. 9. and 10). The

dashed curve is the estimate of the Mg“(7 ,s) cross section made

previously by subtracting the Mg^fy.n) of reference 8 from tne measured cross section for natural Mg (see reference 5).

u.s. department of commerce

NATIONAL BUREAU OF STANDARDS form N8S-418

(8-1-83) USCOMM-OC 185S8-P63 PHOTONUCLEAR DATA SHEET 365
Ref. F.R. Metzger, C.P. Swann, V. K. Rasmussen

Nuclear Phys. 1 6 , 568 (i960)

Elem. Sym.

Mg 25

Ref. No. 60 Me 1

12

Method Protons from Bartol-ONR generator; (p,p'7), etc. reactions for y

source; ring scatterer; Nal. JHH

Reaction E or AE ad E J

it Notes

(7,7) 1.61 3.0

±1.5X10

-2

ev 3/2

H

FORM N8S-418

(a-i-*3) USCOMM-OC 1835S-P83

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 366
Ref. V.K. Rasmussen, F.R. Metzger, C.P. Swan

Phys. Rev. 122, 1 386 (1961)

Method van de Graaff; 1.6l MeV y source by Mg^^p'-y) with I4 .Q MeV

protons; ring scatterer; Nal.

Elem. Sym.

Mg 25 12

Ref. No. 61 Ra 1 JHH

Reaction E or A E s

ffd E J

it Notes

(y,y) 1.61 1.61 (7/2+) Assuming level to be 7/2+, mean life

is (2.5to*^) ^ ^ ^ sec * Angular

distribution fitted to l+(0. i4-2±0.03)P2

cosS + (0.03±0.003)P^ cos 0 but P^

term probably about zero.

PULSE HEIGHT

rio. o. ixusuiiaui blattering or me l.Oi-Mev y rav (rom Me25 rhe upper curves give the original data for the scatterer-absorber combinations noted Statistical errors can be estimated from the lett-hand scale which gives the total number of counts for each point. .Magnesium scatterer-aluminum scatterer differences are shown in the lower plot, where the solid curve drawn is the shane found tor an isolated 1.61 -.Mev 7 ray from a radioactive source and is normalized to the aluminum absorber data. The sum of the counts tor pulse heights 34 to 37 was taken to represent the resonance effect.

form NBS-418

(8-1-63) U SCOMM-DC 1 8856-P63 PHOTONUCLEAR DATA SHEET 367

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Re/. E.C. Booth, K«A. Wright

Nuclear Phys, kj2 (I962)

Elea. Sym.

Mg 25 12

Ref. No. 62 20—6^

Method 4 MeV electron Van de Graaff; bremss,; nuclear resonance

scattering, ring scatterer; Nal JHH

Reaction E or AE

S

ad E J

Note*

Mg25

(Y,Y)

Bremss,

0-4

Table 2 Comparison of mean Lifetime measurements

Nucleus Eoerjy Spins r„r W'{Q) TX 10“ se

This work Other

Li* 3 56 ; 1*- 0 in l 0.012 0.00‘>o -0 0015

2 -0 0013

B" 2.14 81 1 1 l 0.53

0.0105 -0.001 '») 0.47 r0 06 “) U‘: 2.21 100 r (D l 3.2 2.7 — 0 3 “) Al 17

l 01 100 I'-f t 0 98 l 520 170 — 50 l *>

Si“ 1.78 92 5 l 0 63 88 73 -22

511 2.24 96 0* — 2- 5 1 0.63 26 16 l#

) MgM 1.37 78.6 0*-2“ 5 l 0.63 220 155 -40 “) M*“ 1.61 25 t*-i t (D l 36 2.5 «

w d

d

II1

Cu- 0.943 69 i-t »

1 0.92 230 72 -18 >')

Cu- 0.97 99 i-i *

.

1 1 100

90

31 -15 ,#

) — 3 “>

The (actor {

equals (1/ - i ) (2/,-H l)

101 R. C. wPhys. Rev. 14# <1966) 1466 IDS. Vegan. L. Hirshs ana R. Heath. IDO-lWTf

IS) LemUm Cotom aa4 Ralph Tohs«. Mscaar Phnioa 14 (1M6) 343

IS) W C. Baroer. F Berthold. G. Fnela and F. E. Gudden. Phys. Rev. 129 (I960) 2126

1 14) F. R Metzger. C P Swann and V. K. Rasmussen. Phys. Rev 110 (1958) 900

lfl) F R Metzger. C P Swann and V K. Rasmussen. Nuclear Phvsm 14 (I960) 666

19) S. Ofer and A. Schwarzschild. Phys. Rev Lett. 3 i 1969) 384

17) V. K. Rasmussen. F. R Metzger and C. P Swann. Phys. Rsv. 131 (1961) 1396

19) J B. Cummings. A. Schwarzschild. A. W. Sunyar and N. T. Pottle. Phys. Rev. 130 (I960) 2128

19) T. Rothen. F. R. Metzger and C. P Swann. Nuclear Phvsics 33 (1961) 303

1 - - —... , n ro rm NBS-418

(9-1-491 J3COMM-OC 19B86-P69 PH0T0NUCLEAR DATA SHEET 368

u.s. department or commerce

NATIONAL BUREAU OF BTANOARO*
ref. E.C. Booth, B. Chasan and K.A. Wright

Nucl . Phys. 57, 403-420 (1964)

CL. CM. SYM.

Mg 25 12

METHOO

Van de Graaff; resonance fluorescence

REF. NO. 64 Bo 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,G LFT 1-3 C 1-3 NAI-D

—

s

OO (0.5 - 3.0) (0.5 - 3.0)

ABI

Taule l Cases of observed resonance lluorescence

Nucleus

multipol.

Stale (MeV)

spin r„;r ngwrsir*)-'

(sec).

Mean lifetime T BCW

(sec)

Mean lifetime T

other

(sec)

Ref. T’o/^’w BCW

Mg“ 0.00 Ml 1.61 r i 21±5x 10-“ 28±7x 10-“ 25:Jx 10-“ u ) 0.085

form N3S-41I REV. -.1 4.44) USCOMM-OC 2«010-P64

U.s. DEPARTMENT OF COMMERCE

NATIONAL 5UREAOCF ST AM CARDS PHOTONUCLEAR DATA SHEET 369
REF. I. Bergqvist, J. A. Biggerstaff , J. H Phys. Rev. JJ>8, 1049 (1967)

METHOD

Gibbons, W. M. Good

EL EM. SYM.

Mg 25 12

67 Be 7 egf

RESULT EXCITATION SOURCE OETECTOR

REACTION ANGLE ENERGY TYPE RANGE TYPE range

N.G LFT 7 D 1 NAI-D 0-7 90

SOURCE 84 KEY

Tab

L

r IV. Gunmi rays from £*-84 keV, J’ — §~.

Ey (MeV) I, (per 100 captures) Assignment — J,’ rT< (meV) 1000|jf|!

7.41 18±1 C-0 630 2.7 6.83 67±2 C — 0.58 1--1+ 2350 13. 5.45 2.5±1.0 C — 1.96 r-r 85 0.9 4.84 12.5±1.5 C —* 2.57 440 6.7 (3.9)* (1.4) (3.25) (1.2)

(2.8) (2)

(2.5) (2.4) 1.98 11.1±0.9

|

f 2.57 —* 0.58

1 1.96 —» 0

1.58 3.3±0.4 {

( 2.57 — 0.98

L (1.61 —0)

!\ «n - 1 +

) 1.38 2.4±0.4 1.96 — 0.58

0.98 5.7±0.8

|

f 1.96 — 0.98

l 0.98-0 /!

+ -r

* Parentheses imply marginal credibility.

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS form NBS-413

(R EV. 7-14-04) U3COMM-OC 20010-P64 PH0T0NUCLEAR DATA SHEET 370
Y. Oka, T. Kato,

Bull. Chem. Soc.

METHOO

K. Nomura, T. Saito,

Japan _41, 380 ( 1963;

Hui-Tuh Tsai ELEM. SYM.

Mg '25 12

68 Ok 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,P ABY THR- 20 C 20 ACTI

API

l Ani.t 1. Summary of data on (r,p) reactions with 20 MeV bremsstrahluno

Nuclide

Parent Residual

(Natural (Half-life) ahundanre. %)

s> (MeV)

Observed /--ray Yield determined Energy

(MeV)

Branching

ratio (%)

Type of multipole

transition /iCi/mg»> Yield/mol • R

“Mg (10.11) -*Na (15 hr) 12.06 1.37 too £2 1 .48X 10-* 1.7x10'

»Si (4.71) :, AI (2.27 min) 12.33 1.78 100 £2 1.91 2.8 x 10'

'»Si (3.12) =»AI (6.56 min) 13.59 1.28 93.8 £2 + A/1 6.51 X 10-

*

1.5x 10'

,4 Ga (2.06) *'K (22.4 hr) 12.17 0.374 85 £2-t-A/l 7.86x10-' 1.3x 10* •"Ti (7.32) **Sc (84. Id) 10.47 0.887 100 £2 7.11 X I0-* 3. 1 x 1 0> **Ti (73.99) * 7 Sc (3.4d ) 11.44 0.160 100 £2 + A/I 6.83X 10-' l.2x 10» **Ti (5.46) •»Sc (l.Bd) 11.35 1.31 100 £2 4.40x 10-' 5.8X 10* »>Cr (9.55) “V (3.8 min) 11.15 1.43 100 £2 5.01 x 10-

‘

6.6x10*

»7 Fe (2.17) “Mn (2.58 hr) 10.57 1.81 23.5 £2+ A/1 8. lOx 10-' 2.1x10*

7*Ge (36.74) ,3Ga (4.8 hr) 10.92 0.295 97 (£2) 3.70x10-' 1.3x10*

77Se (7.58) 7C As (26.5 hr) 9.61 0.559 41 £2 1.48X 10-» 1.3X 10*

»7Sr (7.02) **Rb (I9d) 9.41 1 .08 9 £2 5. 15x 10-‘ 9.9x 10* “*Cd (12.26) "*Ag (3.2 hr) 9.74 1 .39 35 £2 1 .91 x 10-' 2.1 x 10* "7 Sn (7.57) "•“In (54 min) 9.58 1.27 84 £2 9.80X 10-' 6.9x 10'

l,7 Ba (11.32) "*Cs (13d) 8.67 0.830 100 £2 1 ,68x 10*‘ 2.2x 10* ‘"Hg (16.84) "*Au (2.7 d ) 7.27 0.412 100 £2 8. 43 x I0-* 2.2x 10*

a) The value corrected at the end of 1 hr irradiation (9.4 x 10* R/min).

Fig. 2. The yield curve for the ( t , p) reaction with 20 MeV bremsstrahlung.

form NBS-418

(H EV. 7-t 4- 64) USCOMM-OC 2SC10-P94 PHOTONUCLEAR DATA SHEET 371

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANOARDS

L. W. Fagg, W. L. Bendel, E. C. Jones, Jr.

T. F. Godlove

Phys. [lev. 187, 1384 (1969)

method

H. F. Kaiser, and

Mg 25 12

REF. NO. 69 Fa 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

E,E/ ABX 0-27 D 39,56 MAG-D 30-56 180

(38.9,55.9)

303 T

ieo* electron scattering

EXCITATION (M»V)

J-PI. B(ML )

lacr electron scattering

sr

E0

« 55.9 M«V

-6 «<0*a

|

1

>

I 2 —4

. . /v

,Jr ^43 W *, A

/

‘ 'OJ a 7 7 "'V r. v»y . / -y

•

EXCITATION UA.VI

Fig. 1. Spectrum obtained from 180° electron scattering by

“Mg with £0 = 53.9 MeV, covering the excitation energy range

12-27 MeV.

Fig. 2. Ditiercntiai cross section for 180° electron scattering from “Mg with £» — 55.9 MeV, covering the excitation energy

range 0-12 MeV.

.90* ELECTRON SCATTERING

ar “ m<j E0

. 38.9 MeV f

• -12 xlO'“

X

l :—

c

,2 10 6 6 4 2 0 EXCITATION IMeVl

Fig. 3. Differential cross section for 180° electron scattering from “Mg with £o=38.9 MeV, covering the excitation energy range 0-12 MeV. The gap in the spectrum arises from the fact that a preliminary survey, as well as the 56-MeV data, showed

no structure of interest in this region; thus presentable data were not accumulated here.

3 905

l ) II.W'

3.333 ' 2.708——— 11 ) 1043.

2.204

( 1 *

( >*

qOQRO — Vi* 74| ”N4 Vi*

7.03

T444 Vi*

‘ Vi* TM778

•( )*

3.74 ( >* 5.90

-t 7/^i* iai

•5** 0

-<Vi>

-(Vi)* V

13

“G.C. Morrison, D.H. Youngblood, R.C.

Bearse, R.E. Segel, Phys.Rev. 174 . 1366

(

1 68]

P.M. Endt, C. Van der Leun, Nucl. Phys.

A105 . 1 (1967). 372

.. c-nergy- level diagram adjusted for the Coulomb dis- placement showing “Na, “Mg, and “A1 analog states. In the

. Mg scheme only states excited and analyzed in this work are rtmentof commerce

shown with solid lines. Some corresponding “A1 states are shown. vre»uof standards

Energy values given in the “NTa and “A1 level schemes are those quoted from Ref. 18 except for the 7.916- and 7.98o-MeV levels quoted from Ref. 5.
Table I. Values of differential cross section, isospin, spin and parity, spin projection on the nuclear axis, transition radius, and radiation width for energy levels excited in “Mg.

Plane-wave Born approximation DWBA corrections

Level energy ( d<r/dQ)u (<f<r/d£2)j» Rm

27+1

27o+i

r' 27+1

27»+l

r<>

(MeV) (icrM cm*/sr) T A' (fm) (eV) (fm) (cV)

1.60±0.02 91±7 158±15 i I* 2.7 0.078 2.4-sV 1 0.055^,.o,2

-M,J1“

5. 77±0.04 27±3 3S±8 1* (i+

) (D 2.4 0.83 2.0..V* O.dl^V*

7. 03a:0.05 13±4 42±8 1 (! +

) (n 3.8 2.9 3.7±0.5 2.2^).j+1 '°

7. 81 ±0.03 59±4 100±10 1

i a 2.9 6.5 2.6_,VJ 4.7..V*

1 0 . 4\3 rt 0 . 05 39±6 104±1.S (5) ( )*

( )» 3.7 22 3.5±0.3 17±5

11.37±0.07 34±8 68 ±15 (» ( )»

( )» 3.3 16 3.o-.y# -‘ 12V 1 1 . 76±0.06 41±8 87± 16 (3) ( )•

( )• 3.4 24 3.2_V‘ isv

* §*• I*, or j*.

373
,EF ' B. L. Berman, R. J. Baglan, and C. D. Bowman

Phys. Rev. Letters 2^, 319 (1970)

! EL EM. SYM.

Mg 25 12

REF. NO. 70 Be 5 hrag

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE G,N ABX 7- 10 C 11 TOF-D 135

The photoneutron cross section for Mg25 has been measured from 30 to 2000 keV above

threshold. The locations of the isobaric analogs of the ground and first excited states

of Na25 have been assigned and lower limits for their neutron-decay widths have been

determined.

EXCITATION ENERGY (M«V)

EXCITATION ENERGY (M#V)

FIG. 1. Differential photoneutron cross section for Mg25 at 135° as a function of laboratory neutron energy

(lower scale) and of excitation energy (upper scale) . The arrows refer to peaks resulting from transitions to the

first excited state of Mg24

, (a) Low-energy cross section; (b) high-energy cross section. 374

DEOARTMENTOF commerce

jnal bureau op standards
p
R. A. Alvarez, B. L. Berman, D. R. Lasher, T. W. Phillips, and

S. C. Fultz

Phys. Rev. C4, 1673 (1971)

ELEM. SYM. A

Mg 25 12

METHOD

71 A1 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G » N 3 51 ABX 7-29 D 7-29 BF3-I 4 PI * G,2N 351

+

ABX 23-29 D 23-29 BF3-I 4 PI

* INCLUDES G , NP 252 +

TABLE IL Integrated total photoneutron cross sections and their moments.

E•^vmax ^ in r " h Nucleus (MeV) (MeV' mb) (mb) (mb MeV-1

)

22 Na 27 119 5.74 0.288

25 Mg 29 249 11.7 0.584

j

I E

y max £ thr

'1<7-n= j1P °tot a dE.

-thr

Ph*t«n Eacr( j

( MtV)

FIG. 3. Cross sections for 25 Me. (a) Total photoneutron cross section, oi(V, n)*(y,np) + (y,2«>|. (b) Singlephotoneutron cross section, (7l(y,/i) + (y,«p)l. (c) Doublephotoneutron cross section, <7(y,2nj.

(over)

form N8S-418

(R EV. 7-1 4-04) USCCMM-QC 20010-P04 PHOTOHUCLEAR DATA SHEET 375

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUR EAU OF STANDARDS
FIC. 4. Comparison of the present total photoncutron cross sections with previous measurements. The dashed curves

--.ideate the results of Sato (Ref. 11) for :l Na and of Nathans and Yergin (Ref. 13) for 25 Mg; the dash-dot curve represents t.-.e "Na data of Fielder, Bolen, and Whitehead (Ref. 12).

376
m

m

m

m

R. J. Baglan, C. D. Bowman and B. L* Berman

Phys. Rev. £3, 672 (1971)

method

Mg

REF. NO.

25 12

i 71 Ba 2 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

angle

TYPE RANGE TYPE RANGE

G,N ABX 7- 11 C 8,11 TOF-D 135

(7.3-11.0)

FIG. 16. The 135’ differential threshold photoneutron cross section for :sMg

(see caption to Fig. 4).

3lC5

FIG. 4. The 135* differential threshold photoneutron cross section for

:57Pb at low energies versus the energy of the emitted neutron (lower scale) and the excitation energy (upper scale). The arrows indicate pealcs which decay to excited

states of the residual nucleus (ES), or peaks owing to contaminating Isotopes in the photonautron sample. The inset shows the J0I Pb(y,») cross section averaged with a square 40-keV wide smoothing function.

Also see:

R. J • Baglan et al.

Phys. Rev. £3, 2475

(1971)

FORM NBS-418

(R EV. 7-1 A- 64) USC OMM-OC 26 010- PA 4

[over]

U.S. DEPARTMENT of COMMERCE

NATIONAL BUREAU OF STANOARQ®

PHOTONUCLEAR DATA SHEET j77

»

mi
TABLE VII. Resonance parameters for “'“"“Mg, la F, and jl P. For all resonances, the area under the peafc in the 135” differential cross section is multiplied by 4x to yield approximate values for gy r TOr„/r »gr r 7

,. For those resonances where J* is known, the differential area is multiplied by the appropriate factor F from Table I to obtain Tr0 . El

is the laboratory neutron energy for the (y,n) reaction and En is the corresponding laboratory neutron energy for a neutron-induced reaction. Column 5 labels the peak as a ground-state (GS) or excited-state (ES) transition as deter- mined in this work alone.

Nucleus El

(keV) E„

(MeV) *r r r<>r./r

(eV)

GS

orES J*

r70 (eV) En (keV)

(This work)

,4Mg 22 16.559 0.61 (I -

) 0.40 28

55 16.596 2.4 GS <1“) 1.6 66 no 16.656 4.0 GS (I") 2.7 128

312 16.871 10.7 (I-

) 7.1* 354

382 16.95 432

717 17.30 19.

5

(I -

) 13.0* 804 1210 17.83 1348

1620 18.26 1799 1955 18.61 2168

siMg 41.1 7.374 0.09 GS 46.8

45.1 8.746 0.31 ES

74.9 7.410 0.36 GS r

b 1.1 84.1 b 208 3.920 0.29 ES

236 7.580 0.09 GS 261 404 7.756 0.03 445

439 7.793 0.05 484

472 7.828 0.06 520 515 7.873 0.46 GS i* e 567

601 7.964 0.18 661

781 8.152 1.51 GS 857

912 8.292 0.72 1003

1236 9.999 2.4 c ES i* or § « 1707 9.12 1869

1764 9.18 1931 *Mg 54.3 11.155 2.6 GS 1~(1\2*) 1.75 62.3

63.2 11.164 0.05 0.034 72.2 181 11.289 1.0 GS 1“(1* , 2*) 0.68 202

222 11.333 1.9 GS 1*(1*,2*) 1.3 248

391 11.511 5.1 GS 1-(1*,2*) 3.5 433

621 11.753 32.5 GS 1“(1*,2*) 22.2 684 738 15.0 d ES 5.1 1122 12.279 14.7 GS 1”(1+

, 2*) 10.0 1232

*‘F 100 10.542 1.8 GS 118

Sip 109 12.429 0.86 121 280 12.609 0.60 307

398 12.732 0.59 434

678 13.026 0.90 737

939 13.297 4.4 1018

•These values for r„, when increased by approximately a factor of 2 in order to Include the relatively high cross

sections in the valleys, agree very well with corresponding values from Ref. 8 (see Ref. 4).

b This resonance was seen at £„ =83 and 84 keV in Refs. 24 and 25, respectively.

c Analogs of states in 2iNa (see text). The value forg, Ty*!", /r given in Ref. 26 was not corrected with the multiplicative factor in Table II. d Assumlng a first-excited-state transition.

*R.L. Van Hemert, C.D. Bowman, R.J. Baglan, and B.L. Berman (to be published)

;

R.L. Van Hemert, University of California Lawrence Radiation Laboratory Report

No. UCRL-5C442, 1963 (unpublished).

gS.C. Fultz, M.A. Kelly, J.T. Caldwell, R.R. Harvey, and B.L. Berman, Bull. Am.

Phys. Soc. 14. 103 (1969), and private communication.

2bi .W. Newson, R.C. Block, P.F. Nichols, A. Taylor, A.K. Furr, and E. Merzbacher,

Ann. Phys. (N.Y.) 3, 211 (1959).

^D.J. Hughes and R.B. Schwartz. Neutron Cross Sections (U.S. Government Printing

Office, Washington, D.C., 1966;, 2nd ed., 2nd Suppl., Vol. lie.

378
B. L. Berman and T. W. Phillips

Phys. Rev. G6, 2295 (1972)

ELEM. SYM. , A

Mg 25 12

METHOD REF. NO.

72 Be 9 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,N NOX 7 C UKN TOF-D 90

(7.864)

Repeat of previous experiment. SEE 70BE5

The location la of the isobaric analog of the first excited state of J5 Na has been measured to be 7864.5*1.2 keV. Combining this result with other data yields a value for the coefficient of the cubic term In the isobaric-multlplet mass equation of -0.2*4 keV.

f o rm N3S-418

(REV. 7-14- 64

)

USCOMM-OC 2601C-P64 PHOTONUCLEAR DATA SHEET 379

U.S. DEPARTMENTOF COMMERCE

NATIONAL 3UREAUOF STANDARDS
REF. E. W. Lees, C- S. Curran, S. W. Brain, W. A. Gillespie,

A- Johnston, R. P. Singhal

J. Phys. Gl , L13 (1975)

ELEM. SYM.

Mg 25 12

REF. NO.

75 Le 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

F r F/ LFT o1 rr D 62-119 MAG-D DST

1.611,3.405 MEV

Abstract. The members of the ground state band of 2S Mg have been studied in the momentum transfer range 0-2 to 1-15 fm-1

. The reduced transition probabilities and

transition radii were measured for the 1-612 MeV and 3-405 MeV levels. The transition probabilities are shown to be considerably more precise than existing measurements and

are compared with various theoretical predictions. The bexadecupole strength to the

-f- + levels is also discussed.

Table 1. Best fit dwba parameters.

E, C, r hr Rut BCE2,t)J x

1 pdf§ (MeV) (fm) (fm) (fm) (e1 fm*)

1-611 ±0-004 2-85+0-20 2-21 ±0-23 4-25 ±0-11 158±7 1-0 3-405 ±0-007 2-48 + 0-43 2-42±0-32 4-28±0-I8 57 ±4 0-7

t R,

,

is the transition radius.

t f?(E2,t ) is the E2 reduced transition probability from the ground state. §X

J pdf is x2 Per degree of freedom.

Table 2. Comparison of ' ) deduced from lifetime measurements and present

results. See text for references to individual measurements.

Ground

state Et(MeV)

J

n Lifetime

(fs) Mixingratio branchingratio R(E2,t

)

(e 1 fm*) BfE2,T )e, e' (e- fm*)

1-612 1 * 7 20-6± 2-6* o-:o±o-o: 100% 187 + 43 153 + 7 24-5±3-3“ 0-20 -‘-0-02 100% 157 + 37 158 ±7

3-405 9 -f 10± 5 0 13±1% 54+27 57 + 4

* Includes the measurement by Fagg et at (1969). “Excludes the measurement by Fagg et at (1969).

Phys. Rev. 187, 1384 (69)

Figure 1. Inelastic form factors for the v

+ level in :3 Mg at 1-612 MeV fO) and for the

level at 3-405 MeV (#). The full curves are the corresponding best-fit dwba

Coulomb form factors for an L = 2 transition. The upper curve is multiplied by a

scale factor of 1-5. See text for further details. 380

U.S. OEP ARTMENT of commerce

NATIONAL BUREAU OF STANDARDS
REF. K. Bangert, U.E.P. Berg, G. Junghans, R. Stock, K. Wienhard,

H. Wolf

Nucl. Phys. A261 , 149 (1976)

EL EM. SYM. A Z

Mg 25 12

METHOD

76 Ba 2 egf

EXCITATION ENERGY

SOURCE OETECTOR

REACTION RESULT TYPE RANGE TYPE RANGE ANGLE

G,P ABX 14- 18 c 19- 29 TEL-D 90

G, A ABX 18- 24 c 29 TEL-D 90

G,D ABX 19- 24 c 1 29 TEL-D 90

G, PG ABY 13- 29 c 19- 29 SCD-D 90

G,NG ABY 8- 29 c 19- 29 SCD-D 90

329

300

200

100

Fig. 6. The 90“ 23 Mg(y, p0) differential cross section as derived from the 18.5 MeV proton

spectrum, assuming ground-state transitions.

U IS 18 Excitation Energy

^Mg

Fig. 7. The 90“ 23 Mg(y, d) and J3 Mg(y, a) differential cross sections derived from the 28.7 MeV

particle spectra.

Fig. 8. A comparison between the 28.7 MeV 23 Mg photoproton spectrum and a “(y, p0 )” spectrum

derived from the 23 Mg(y, p0 ) differential cross section of fig. 6.

(over)

FORM N3S-418

'REV. 7-14- 641 USC OMM-N 8S-OC PHOTONUCLEAR DATA SHEET 381

U.5. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Table 4

Results of the 2J Mg(y,xy') experiment, giving the “bremsstrahiung-weightcd” integrated cross

sections in MeV mb for the population of excited residual nuclear states

Brcmsstrahlung endpoint energy (MeV)

18.5 21.0 28.7

(a) 24

j

V

a stales

g.s. 4*

472 keV, 1- *> 9 9 563 keV, 2

+ *> 9 7 1341 keV, 7+1347 keV, 1* 0.89 6.09 1345 keV, 3 0.52 2.20

1511 keV, (3, 5)* 0.33 2.21 1885 keV, (2, 3)* 0.41 3.72 2513 keV, (1-3) 0.15 1.25 2561 keV, (1-4)* 0.49 3.67 2909 keV, 3* 0.23 1.15

(b) 2 *Mg states

g-s. 0* 13.04 a

) 24.9 J

) ? 1369 keV, 2* 4.30 4.76 12.84 4123 keV, 4* 1.32 2.12 5.18 4239 keV, 2* 1.04 1.34 3.64 5236 keV, 3* 0.82 0.93 2.65 6010 keV, 4* 0.55 0.53 1.56 7616 keV, 3“ 0.18 0.42 1.63 8436 keV, 4* 0.29 1.03 2.94 9515 keV, 4* T= 1 0.78 2.84 9827 keV, 1 + T = ? 0.29 1.28 9967 keV, 1 + T = 1 0.55 1.05 10059 keV, (1,2)* T= 1 10822 keV, ?

0.32 1.38

1.42

(c) ziNa states 404 keV, |* 2076 keV, |*

*> 9 93.11

(d) 2 l Ne states 350 keV, 5*

1746 keV, 5*

9 9 ? <1.32 Sum of observed (y

,

p) excited states cross sections 3.07 20.29 Sum of observed (/, n) excited states cross sections 8.5 13.12 38.42 Proton yield 12.15 77.10

(y. n) + (y, np) yield *) 21.54 38.02 106.11

Brcmsstrahlung spectra are normalized at 11.44 MeV.

a

) Calculated from the data of ref.

2

).

2S.C. Fultz et al., Phys. Rev. C£, 149 (1971);

R. A. Alvarez et al., Phys. Rev. C4 , 1673 (1971).

382
m

«]

m

REF.

METHOP

E. W. Lees, C. S. Curran, T. E. Drake, WA. Johnston, and R. P. Singhal

J. Phys. (London) G2_, 341 (1976)

A. Gillespie, ELEM. SYM.

Mg 25 12

REF. NO.

76 Le 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RAN GE TYPE RANGE E,E/ FMF 1- 4 D 62-119 MAG_D DST

Table 3. Results for the dwba analysis of the present data using an L = 2 transition within the framework of the Tassie model. The accepted values have been used for the excitation energies, spins and parities of the states.

7 LEVELS, .98-4.1 MEV

E, d. r„ R,r B(EZ !) (MeV) J' ffm) (fm) (fm) (e

2 fm‘‘)

0-975 V 2-85t 2 21t 4-25t 2-3 ± 0 6

1-612

7T 2-S5 ± 0-20 2-21 ± 0-23 4-25 ±0-11 156 ± 7 1965 5.+ 2-S5+ 2-2 It 4-25t 3 0 ± 0-5 2-563 1 f

2 2-45 2-21

1

4-01 4-3 ± 0-8 2-801 3I 2-45T 2-2 It 4-01t 5-3 ± 0-4 3-405 9T 2-48 ± 0-43 2-42 ± 0-32 4-28 ±0-18 57 + 4

4-059 9 + 7 266 2-2 It 4-13 9 6 ± 10

t Denotes that the radial parameter for this level was fixed.

,0

‘ 3r

0 04 08 12

glfm ''I

Figure 3. Inelastic form factors for the transitions in 25 Mg to the levels at 0-975 MeV

(O) and 1-965 MeV (•). The full curves are the corresponding best-fit L = 2 Coulomb

form factors calculated in dwba. The upper curve and data are multiplied by a scale factor of ±°.

10‘3r

0 0 4 0 5, '2

glfm’ )

Figure 4. Inelastic form factors for the transitions in --Me to the !e\eis at - MeV

1C) and 2 SOI MeV (•). The full curves are the corresponding best-fit L = 2 Coulomb

form factors calculated in dwba. The upper curve and data arc multiplied by a scale

factor of 3 and the lower ones by Y

FORM N3S-418

'REV. 7-14-64) USC CMM-N SS-O C

0 04 08 12

g

( fm 1

Figure 5. Inelastic form factors for the transitions in

23 Mg to the levels at 4056 MeV

(O) and 5-252 MeV (•>. The full curve is the corresponding best-fit L = 2 Coulomb

form factor calculated in dwba. The upper curve and data are multiplied by a scaie

-yS 3 factor of 2 and the lower data by
-

I
ref. K. Masumoto, T. Kato, N. Suzuki

Nucl . Inst. Meth. 157, 567 (1978)

EL EM. SYM.

Mg 25 12

hg

R EACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE R AN GE

G,P ABY 12-68 C 30-68 ACT 4 P

I

Analysis is made of reactions interfering with

photon activation analysis procedures.

The activation yield curves have been presented For a number of photonuclear reactions in the energy range from 30 to 68 NleV, in order to evaluate quantitatively the interferences due to competing reactions in multielement photon activation

analysis. The general features of the yields as functions of both target mass number and excitation energy were elucidated from the data obtained, discussion being given on the results in terms of the reaction mechanism.

Simultaneous neutron activation due to appreciable neutron production from the converter and surrounding materials has also been studied, and. finally, the magnitudes of interferences in real multielement analysis were given in the form

of their energy dependences.

-3RM N3S-413 (over)d.s. 8EPAR T ME‘ - 2 F COMMERCE

*

m

384
E

max

(McV )

Fig. 10. Yields of the ly, p) reactions as a function of bremsstrahlung maximum energy and target mass number. The

numerical values in the figure are yields per equivalent quanta

in mb.

385


Mg

Mg

A=26

Mg

A=26

Ref. V.K. Rasmussen, F.R. Metzger, C.P. Swan

Phys. Rev. 123 , 1386 (1961)

Eiem. Sytn.

Mg

A

26

z

12

Method f Van de Graaff; I.83 MeV 7 source by Mg (p,p'Y) with k.k- MeV protons;

ring scatterer; Nal.

Ref. No. 61 Ra 1 JHH

Reaction

(7, 7)

E or AE

1.83

dE J " Notes

1.83 Mean life = ( 7-3 ) X 10"^5 sec.

f

*

0

0

0

0

PULSE HEIGHT

Fig. 6. Resonant scattering of the 1.83-.\Iev y ray from Mg;ii. The upper curves give che original data for the scatterer-absorber combinations noted. Statistical errors can be estimated from the

left-hand scale which gives the total number of counts for each

point. Mg scatterer-Al scatterer differences are shown in the lower plots, where the solid curve is that obtained when the counter is exposed to direct radiation from the target. The sum

of counts for pulse heights 39 to 42 was taken to represent the resonance effect.

form NBS-418

(8-1-83) USCOMM-OC I85S8-P83

u.s. department of commerce

NATIONAL 3UREAU OF STANDARDS PHOTONUCLEAR DATA SHEET 389
" eF - E. C. Booth, B. Chasan and K. A. Wright

Nucl . Phys. 57, 403-420 (1964)

EL EM. SVM. A

Mg 26 12

METHOD

Van de Graaff; resonance fluorescence

KEF. NO. 64 Bo 1 NVB

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,G LFT 1-3 C 1-3 NAI-D 100

(0.5 - 3.0) (0.5 - 3.0)

ABI

Taiile I Cases of observed resonance lluoresccnce

Nucleus

multipol.

Slate (MeV)

Spin I'jr T(g«-lV/n

)

1

(sec).

Mean lifetime T BCW

(sec)

Mean lifetime T

other

isec)

Ref. rairw BCW _ Mg2* 0.00 0” E2 1.83 2

f

1 12±5x 10-“ 37£l5x I0- 1 * 70 i 30 x IQ->* u

) 22

fobu N3S-418

'REV. 7*1 4. 641 uscomm-nbs-oc PHOTONUCLEAR DATA SHEET 390

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF 3T ANOARDS
REF‘ 0. Titze and E. Spamer

Z. Naturforschg. 21a, 1504 (1966)

ELEM. SYM.

Mg 26 12

METHOD REF. NO. 66 Ti 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

E.E/ LFT 7-15 D 51 MAG-D 36-51 DST

Angular distribution measured for q = 0.48, 0.41, 0.32 fm

- 1 DST CONST 0

24

£ 0

= 51,0 MeV

3 =129 0

i3.as '4J0 14 .O 14,48 H 13 12 11 Excitation Energy (MeV)

1 to

£ Counts

PC

b 45

- 40

35

L 30

r 25

- 20

' ** ipectrum of melasucally scattered electrons from »Mg. The effective target thickness was 50 mg/cnr. The arrows in-

" M “,c measured excitation energies in MeV. The type o£ transition [electric (E) or magnetic (M) ] is labeled. Note the suppressed zero of the ordinate scale. The elastic peak has a height of 2.4 x 104 units of the ordinate scale

Ex (MeV) r* (eV) T//Av fftr (fm)

9.85 ±0.04 1 9.97 ±0.03 / Ml 7.95 ±1.2 0.38 3.50 ± 0.49

10.35 ±0.03 E2 0.24 ±0.05 0.58 5.03 ±0.50

10.70 ±0.03 Ml 22.2 ±2.4 0.86 3.60 X 0.36 10.93 ±0.04 E2 0.26 ±0.11 * 0.50 —

* Calculated with Rtr from 10.35 MeV trantitioa.

Table 1. Results for *4 Mg. The first two columns give excitation energies and multipolarities as determined from this work. Column 3 to 5 show the ground state radiation widths r the transition strengths in Weisskopp units Av and the

transiton radii Rir

. The Bohn approximation has been used.

L over

form MBS-418

(R EV. 7-1 4-84) USCOMM-OC 2S010-PS4 PHOTONUCLEAR DATA SHEET 391

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
Mg 26

E 0

= 51,2 MeV

9 =153°

[\

1

i

I7.39

15 14 13 12 11 10 9 8 7 Excitation Energy (MeV)

Fig. 2. Spectrum of inelastically scattered electrons from “Mg. The effective target thickness was 170 mg/cnr. The

dicate the measured excitation energies in MeV. The type of transition [electric (E) or magnetic (M) ] is labeled suppressed zero of the ordinate scale. The elastic peak has a height of 2.5 x 1G1 units of the ordinate scale

12

11

10

9

3

7

arr..\.*

. Not.- •*«,

392
H. W. Kuehne, P. Axel, and D. C. Sutton

Phys. Rev. _16^, 1278 (1967)

ELEM. SYM.

Mg 26 12

METHOD REF. NO. 67 Ku 2 HMG

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,G LFT 10 D 10 NAI-D 10 L35

Photons, defined in energy to about 1% with the aid of a bremsstrahlung monochromator, were scattered by isolated energy levels in C, Mg, and Si. Parameters for the six observed levels are

Isotope Energy (MeV)

r»«/r

(cV) r,/r B(Ml)/(eh/2M

C

1 * 15.11 36 1 0.93 Mg* 10.66±0.02 14 0.8 1.21 Si“ 11.42±0.02 23 1 1.33 Si“ 12.33 ±0.03 Mg* 9.92 ±0.03 3.0 0.5 0.49 Mg“ 10.07 ±0.05 4.2 >0.36

The 15.11-MeV level in C”, the 9.92- and 10.66-MeV levels in Mg“, and the 11.42-MeV levei in Si“ are T=* 1, T, = 0 analogs of low-lying 1+ states in the neighboring odd-odd nuclei. These levels exhaust most of

of the magnetic dipole transition strength of the respective nuclei, and therefore give information about the expectation value of Is in the ground state.

*

m

*

m

form NBS-418

(R EV. 7-t 4-84) USCCMM-OC 2801 0- PC 4 PHOTONUCLEAR DATA SHEET 393

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. W. L. Bendel, L. W. Fagg, R. A. Tobin,

Phys. Rev. J72, 1103 (1968)

F. Kaiser

METHOD

EL EM. SYM. A

Mg 26 12

REF. NO.

68 Be 2 HMG

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE E,E/ ABX 8- 14 D 39,56 MAG-D 180

TAflU I- Leveh at 8 to 14 MeV Ln »Mg found in electron scattering. The differential cross sections are in units of 10-“ cm' persr.

Energy (MeV) (d<r/dCi) 5e M.v ld<r/dtt)y) ne v

Parameters R

(fm)

as transitions To

(eV) Energy and type, Titze and Spamer*

8.52±0.05 81 ±22 159±57

9.24±0.03 268±26 695±63

9.67 ±0.05 246±26 409±69

10.1S±0.03 447 ±30 968 ±77

10.63±0.03 593 ±42 1332 ± 77 11.20±0.05 - 274±26 525±68

11.67, 11.82

12.31 62±26 <97

13.33±0.03 689±35 1174±90

13.66±0.06 110±31 180±76

3.2_i.4+®-‘ 0.5-0.2H,A

8.22 .1/ 8.57 .1/

3.62_o i, 4*'3 3.3_„ t ^» 8.91 E

9.25 .17 2.90.o 1.7_„.,-TM 9.58, 9.80 .\r 3.40.o ,V°‘6 5.7_i ,+‘-J 10.20.1 7+(£)

3. 47 ±0.14 9. 1_1 ;-=°

10.67 ,17+E

3.23_ 0 .33~°' 34 3.9_i.i +i - 3 11.17.17 + £

TO OO <1.2

11.76 £+.1/

12.26.17

3. 10_0 14.5_3.o*3 - 3 12.79 £

13.34.17

3.0_,.o-o 8 2.3_i. s +5 ‘

• See Ref. 10.

10 O. Titze and E. Spamer, Z. Xaturforsch. 21a, 1504 ^1966).

form NBS-418

| IR EV. 7-1 4-441

| USCOMM-OC 24 0 t 0- P4 4

u.s. oepartmentof commerce

NATIONAL BUREAU OF STANDAROS PH0T0NUCLEAR DATA SHEET 394
B. L. Berman, R. L. Van Heraert, C. D. Bowman

Phys. R.ev. Letters 2^, 38b (1969) Mg 26 12

METHOD REF. NO. 69 Be 3 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE G,N ABX 11-13 c 13 TOF-D 0 135

0= 1(J to L2U(J KEV

PHOTON ENERGY (MeV)

11.15 11.3 11.5 12.0 13.0

FIG. 1. Threshold photoneutron cross section for Mg26 at 135° as a function both of photon energy and of laboratory neutron energy. The solid line drawn

through the data points is to guide the eye. The arrows

indicate excited-state transitions. The electron beam

energy was 13.3 MeV.

FORM NBS-418

(R EV. 7-1 4-04) USC OMM-OC 26010-P64 PH0T0NUCLEAR DATA SHEET 395

U .3. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
8B
i

«

«

«

I

I

I

l

«

«

A. GoLdmann

Z. Physik 224, 144 (1970)

EL EM. SYM.

Mg 26 12

method REF. NO.

70 Go 3 egf

REACTION RESULT EXCITATION SOURCE DETECTOR

ENERGY TYPE RANGE TYPE RANGE ANGLE

E,E/ ABX 15-26 D 45-55 MAG-D DST

0L— . 1 —

12 IS 20 24 29 E, [M*¥]

Fig. 3. Riesenresonanz von J6 Mg. Die von den Meflspektren bereits subtrahienen

Anteile stnd in Tabclle 1 zusammengestellt. Die gestrichelten Linien geoen den zur Auswertung angenommcncn Untergrund und die . Integrationsgrenzen an. Alle Spcktren sind aul gleichc elastische FIScbe /4 £

=»3,0- 103 MeV/pAs normien

over ^ form H

B

5- 4 1

8

( R EV. 7-1 4-641 USCOMM-OC 26 0 10- PC 4 PH0T0NUCLEAR DATA SHEET 396

U.s. OEPARTMENTCF COMMERCE

NATIONAL. 0UREAUOF STANOARDS
Tabelle3. Ergebnisse an uMg. bei alien Werten isi AE

=*S,0 • JO* MeVIfiAs. Die

Fldchen A, wurden jeweils in den Bereiehen 14J bis 19J MeV („EX » 17 MeV") and

19J bis 23,0 Me K ?„£.,= 22 MeV") inlegriert. BezugUeh der Slrahlungskorrekturen

sie/ie Unierschrift zu Tabelle 2

£o[MeV] e

[Grad] £x[MeV]

d

2[fm~2

] At [MeV/pAs]

G

[io-«]* B{C\,q)[fm2

]

30,9 153 17 0,180 28,3 1,31 0,72 22 0,155 45,8 2,51 1,05

52,1 141 17 0,180 13.9 1,38 0,54 22 0,155 27,9 3,22 1,07

33,8 129 17 0,180 11,3 1,94 0,54 22 0,155 18,2 3,63 0,91

52,1 81 17 0,087 3,2 3.55 0,65 22 0,080 5,5 7,31 1,30

* <7—(daldQ), (k2J Yt).

Fig. 4. Reduzierte Matrixcleniente fur J6 Mg, inlegriert in den Bereiehen 14,3 bis

19,3 MeV („£,=* 17 MeV") und 19,5 bis 28,0 MeV (,,£, = 22 MeV"). Die Kurven

zeigen die Extrapolation zum Photoncnpunkt fur £lr = 1,3 Rm

(ausgezogcn) bzw. £„ = Rm (gestrichelt)

397
*

m

K

m

V.M. Knvascunov, lN.g. lianas ev, v.D. Aranas ev, h.v.

I.S. Gul'karov, G.A. Savitskii, and N.G. Shevchenko

Yad. Fiz. 12, 9 (1970)

Sov. J. Nucl. Phys. 12 , 5 (1971)

METHOO

bonaarenKo,

ELEM. SVM.

Mg

REF. NO.

A

12

70 Kh 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE oetector

ANGLE

TYPE RANGE TYPE RANGE E,E/ FMF 1 D 225 MAG-D DST

( 1 . 81 )

1 = 1.81

a

n

«

H

m

:

m

Elastic and inelastic scattering of 225-MeV electrons by the isotopes Mg24 and Mg28 have been

measured. Analysis of the data was carried out in the Born approximation. From analysis of the

elastic scattering for a uniform- Gaussian charge-distribution model it is found that addition of two

neutrons to the Mg24 nucleus leads to an increase in the parameter R by 0.03 ± 0.02 F and a de- crease in g by 0.07 ± 0.04 F, which corresponds to a decrease in the mean-square radius of the Mg28 nucleus by (1.6 ± 1.3)% In comparison with Mg24

. Analysis of the inelastic scattering with

excitation of the first 2* level shows that the internal quadrupole moments of the nuclei Mg24 and Mg28 are identical within experimental error.

FIG. 3. Form factors for inelastic scattering with excitation of the

first 2* levels. 1.37 MeV in Mg24 (a) and 1.81 MeV in Mg26 (b). The

solid lines are theoretical curves calculated with Eq. (3).

Characteristics of the first 2' levels of the nuclei Mg24 and Mg26

Nucleus

‘ Lc' c^~*y - J.KKM' ' r. l o'

1

kc a

j Oo.F J

v-’ 1

: i.n; n. at Mc‘4 1 i.m | our. _u.ui , ire-ta co.s - a. i n.ti | r.,04 ; o. 32 j

‘10. \ -2.1 f.4 -4

t:..2 - 1 .3 r.o^

m

a

a

ari

an

PHOTONUCLEAR DATA SHEET 398

U.s. OEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS
r

Refr - 0. Titze, A. Goldmann, and E. Spamer

Phys. Letters 3 IB , 565 (1970)

ELEM. SYM.

Mg 26 12

70 Ti 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

E,E/ SPC 12-28 D 50-54 MAG-D DST

9S*3

CONST 0 = .41 FM-1

12 is 20 24 28 £, [M*V]

Fig. 1. Spectrum of electrons scattered inelastically from 26 Mg at primary’ energy 52.1 MeV and scattering angle

31°, after subtraction of the calculated [€] elastic radiation tail; Ex

= excitation energy. The energy resolution at Ex - 20 MeV is about 130 keV. The dashed lines Indicate the background subtraction and the separation of the two

"bumps*.

FORM NBS-418

IR e V . 7-1 4-941 USC OMM-OC J9010-P94 PHOTQNUCLEAR DATA SHEET 399

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
C. P. Wu, F. W. K. Firk, and B. L. Phys. Letters 32B , 675 (1970)

method

Berman EL EM. STM.

Mg 26 12

j 70 Wu 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,XN SPC 11-23 C 19,23 TOF-D XX

Data taken but not given at E = 21.4 and 27.5 MeV.

ymax

XX = NOT GIVEN

Fig. 2. a) The observed energy spectrum of photoneutrons from the reaction 2S Mg (y. n) 2!5 Mg for a bremsstrahlung end-point energy £ - 2.1.1 McV. The

energy scale assumes groundstalc transitions, b) The

observed energy spectrum of photoncutrons from the reaction 2GMg (y. n) 25Mg with £^max 18-9 MeV. The

energy scale assumes ground-state transitions, c) The

difference spectrum obtained from the two spectra

with £ymax = 23.1 and 19. 9 MeV. The energy scale assumes transitions to the first T = i state in 2 ^Mg at an energy of 7.7926 MeV (In 25 Mg). Note the appearance of doublets for the strong transitions: these are

attributed to transitions to the 7.7926 and 7.9729 MeV

states in 2 ^Mg. The arrows point to the states seen in the work of ref. [1| and (5|.

'

PH0T0NUCLEAR DATA SHEET 400
•
REF ' R. J. Baglan, C. D. Bowman and 3. L. Berman

Phys. Rev. C^, 672 (1971)

i EL EM. SYM.

Mg 26 12

j

REF. NO.

j 71 Ba 2 hmg

RESULT EXCITATION SOURCE detector

REACTION ENERGY TYPE RANGE TYPE RANGE ANGLE

G.N ABX 11-14 c 11,14 TOF-D DST

(11.1-13.3)

Excitation Energy (MeV)

FIG. 17. The 135” differential threshold photoneutron cross section for Z6 Mg (see caption to Fig. 4).

FIG. 4. The 135* differential threshold photoneutron cross section for Z07Pb at low energies versus the energy of the emitted neutron (lower scale) and the excitation energy (upper scale). The arrows indicate peaks which decay to excited

states of the^ residual nucleus (ES), or peaks owing to contaminating isotopes in the photoneutrop sample. The inset shows the “ a ‘Pb(y, n) cross section averaged with a square 40-keV wide smoothing function.

Also see:

R. J. Baglan et al.

Phys. Rev. £3, 2475

(1971)

FORM NBS-4 18 (REV. 7-1 4.64) USCOMM-OC 26010-P64

over]

PHOTONUCLEAR DATA SHEET 401

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANQAROS
TABLE VII. Resonance parameters for I4 4«.J*Mg, ,*F. and 3, P. For all resonances, the area under the peak In the 135° differential cross section is multiplied by 4tr to yield approximate values for £y r yorn /r =*£

y r y0 . For those reso- nances where J* is known, the differential area is multiplied by the appropriate factor F from Table I to obtain T r0 . £ is the laboratory neutron energy for the (y,n) reaction and E„ is the corresponding laboratory neutron energy for a neutron-induced reaction. Column 5 labels the peak as a ground-state (GS) or excited-state (ES) transition as deter- mined in this work alone

.

Nucleus El

(keV) E„

(MeV)

gyEy0 r„/r

<eV)

GS

orES J

n Tro

(eV) £„ (keV) (This work)

24 Mg 22 16.559 0.61 (1~) 0.40 28

55 16.596 2.4 GS <1“) 1.6 66 no 16.656 4.0 GS (I -

) 2.7 128

312 16.871 10.7 (1~) 7.1 3 354

382 16.95 432

717 17.30 19.5 (I -

) 13.0 1 804

1210 17.83 1348

1620 18.26 1799

1955 18.61 2168

:s Mg 41.1 7.374 0.09 GS

46.3

45.1 8.746 0.31 ES

74.9 7.410 0.36 GS a- b

2 1.1 34.1 b 208 8.920 0.29 ES

236 7.580 0.09 GS 261 404 7.756 0.03 445

439 7.793 0.05 3 C

2 484

472 7.828 0.06 520

515 7.373 0.46 GS 2 + c

2 567 601 7.964 0.18 661

781 8.152 1.51 GS 857

912 8.292 0.72 1003

1236 9.999 2.4° ES 2+ nr 5+ c

2 or 2 1707 9.12 1869

1764 9.18 1931

:6 Mg 54.3 11.155 2.6 GS l~(l + ,2

+

) 1.75 62.3

63.2 11.164 0.05 0.034 72.2 181 11.239 1.0 GS 1"(1\2+

) 0.68 202

222 11.333 1.9 GS i _ (r , 2

") 1.3 248

391 11.511 5.1 GS i-<r , 2

*) 3.5 433

621 11.753 32.5 GS l-(l + ,2*) 22.2 684

738 15.

0

d ES 5.1 1122 12.279 14.7 GS 1~(1 + ,2

+

) 10.0 1232

I9 F 100 10.542 1.3 GS 113 Up 109 12.429 0.36 121

230 12.609 0.60 307

398 12.732 0.59 434

678 13.026 0.90 737

939 13.297 4.4 1018

a These values for r y0 , when increased by approximately a factor of 2 in order to include the relatively high cross

sections in the valleys', agree very well with corresponding values from Ref. 3 (see Ref. 4). ’’This resonance was seen at En =33 and 34 keV in Refs. 24 and 25, respectively.

c Analogs of states in :5Na (see text). The value for g y r yo r„ /T given in Ref. 26 was not corrected with the multiplicative factor in Table II. d Assuming a first-excited-state transition.

^R.L, Van Hemert, C.D. Bowman, R.J. 3agLan, and B.L, Berman (to be published);

R.L. Van Heniert, University of California Lawrence Radiation Laboratory Report

No. UCRL- 5O442 , 1963 (unpublished).

g°S.C. Fultz, M.A. Kelly, J.T. Caldwell, R.R. Harvey, and B.L. 3erman, Bull. Am.

Phys. Soc. 14 . 103 (I9c9)} and private communication.

^H.V. Newson, R.C. Block, P.F. Nichols, A. Taylor, A.K. Furr, and E. Merzbacner,

Ann. Phys. (N.Y.) 8 , 211 (1959).

25

'D.J. Hughes and R.3. Schwartz. Neutron Cross Sections (U.S. Government Printing

Office, Washington, D.C., i960;, 2nd ed., 2nd Suppl., Vol. lie.
m

*

m

g

*

REF' S.C. Fultz, R.A. Alvarez, B.L. Berman, M.A. Kelly, D.R. Lasher,

T.W. Phillips, J. McElhinney

Phys. Rev. C4, 149 (1971)

ELEM. SYM.

Mg

A

26

2

12

method

[Page 1 of 3]

REF. NO.

71 Fa 2 hmg

REACTION RESULT excitation

ENERGY

SOURCE oetector

angle TYPE RANGE TYPE RANGE

G.N 3*+H + ABX 10-29 D 10-29 3F3-I 4PI

G r 2N 3*45 ABX 18-29 D 18-29 BF3-I 4P1

32 LEVEL FIT

3Wt

TABLE II. Integrated cross sections of magnesium

isotopes.

Isotope

<J(y,n w)dE

J B thr(McV mb)

1 (Tty, 2n )dE

-/*thr(MeV mb)

:i Mg 30 'Mr 226 68

Natural 76 magnesium

j_ over j form NBS-418

(R £V. 7-1 4-641 USCOMM-OC 26010-P64 PH0T0NUCLEAR DATA SHEET 403

u.s. department of commerce

NATIONAL BUREAU OF STANOAROS
Page 2 of 3

TABLE V. Analytical and experimental resonance energies for *Mg (MeV)

.

r \

- Resonance number

Analytical energy

Experimental energies

Livermore Yale Present data {Ref. 15) (Ref. 17)

(y. *»,) *> fr. "#> <y»

Darmstadt

(Ref. 13)

{•, s')

1 11.17 11.15 11.155

11.164 11J89

11J33

2 11.46 11.47 11.511

3 11.75 11.75 11.753 4 12.35 12 JO 12J79

S 12.80 12.80 12.81

12.90

13.04 13.12

6 13.30 13.35 13 J3 13 J5

13.44

7 13.75 13.75 13.67 13.70

13.83 13.89

14.22 3 14.60 14.60 14.49 14.50

14.91

9 15.15 15.15 15.10 15.12

10 15.70 15.70 15.59 15.73

11 16.25 16.20 16J5

12 16.70 16.70 16.90 13 17.05 17.15 17.16 14 17.65 17.65 17.52

IS 17.95 17.95 17.83

16 18.20 18.20 18.19 17 18.45 18.45 18.51

18 18.75 18.75 18.80 18 .79 19 19.30 19.30 19.32 19J1

20 19.75 19.75 19.63 19.66 21 20.25 20 J5 20.05 20.37 20.12

22 20.82 20.87 20.68 20.77 20.59 23 21.20 21 JO 21.30 21.16 21.09

24 21.50 21.50 21J7 21.42 25 21.85 21.93 21.93

26 22.15 22.15 22.13

27 22 JO 22J5 22.74

28 23.50 23.00 23 .15 24.9 23.60 29 25,35 25J5

30 26.10

31 27 JO 27.00 27 J2

32 28 JO 28 JO

13^0. Titze, A. Goldraann , and E« Spamer

,

Phys. Letters 3 IB , 565 (1970).

15

R. J. Baglan, C.D. Bowman, and B.L, Berman,

Phys. Rev. C3 . o72 (1971).

1/ C.-P* Wu, F.W.K.

Phys. Letters 32B , Firk, and B.L. Berman,

675 (1970).
*

m

m

t

*

10 12 14 16 18 20 22 24 26 28 30

Photon Energy (MeV)

FIG. 5. Double-photoneutron cross section <r(y,2s) for "Mg.

FIG. 7. Total photoneutron cross section + + <Y, 2s.)) for The solid Una Is the sum of 32 Lorentx Unas with parameters listed In Table VI.

porm NBS-418

(REV. 7- \ 4-A41 USCOMM-OC 26010-P94

i U.S. DEPARTMENTOF COMMERCE

national bureau op stanoaros PHOTONUCLEAR DATA SHEET 405
B. S. Ishkhanov, I.M. Kapitonov, E. V. Lazutin, I. M. Piskarev,

and V. G. Shevchenko

Nucl. Phys. A186, 438 (1972)

EL EM. 5 YM.

Mg 26 12

I METHOD REF. NO.

72 la 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G ,XN ABX 11-30 G 11-30 BF3-I 4 PI

Table 3 The position of the structural features (MeV) of (he giant resonance for J *Mg

549

Ref. ,7

) Ref. ‘M The present work

11.11 11.53 1 1.40x0.05

11.84

12.37 1 2.35 ±0.05

13.1 13.00 13.15+0.05

13.3 13.45

13.7 I3.60 ± 0.05

13.9 13.84

14.2

14.5 14.67 14.45x006

14.9

15.1 15.31 15.25x0.07

15.8 15.85 ±0.07

16.2 16.33

16.9 I6.80±o.08

17.6 17.50x0.08

17.9 17.80

18.2

18.8 18.75x0.10

19.2

19.6 19.40x0.10

20.1 20.20 20.10x0.10

20.7 20.85±O.I2

21.1 21.4 22.0 22.0 22.25x0.15

23.6 23.6

24.5 24.8 24.5 x0.2

12

S. C. Fultz _et al.

17

0. Titze _et al. ,

, Phys. Rev.

Phys. Lett.

G4 (1971) 149

31B (1970) 565

Fig. 2. Cross section for 1 *Mg(y, jcn). The dashed line shows the expected behaviour of the (y, n)4-

(y. 2n) + (y, np) reaction cross section above the (y, 2n) reaction threshold.

form N3S-418

(REV. 7-1 4-64) USCOMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 406

U.S. DEP ARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
REF. m

m

METHOD

E.W. Lees, A. Johnston, S.W.

and R.P. Singhal

J. Phys.A: Math., Nucl.Gen.,

Brain, C.S. Curran, W.A. Gillespie,

6, L116 (1973) Mg 26 12

REF. NO.

73 Le 6 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

E,E/ LFT 2 D 0.4*1.

MAG-D TTK-TM

2=1 . 809MeV,*=FM-l

Table 1.

(o) Method B(E2, t

) (e2 fm ‘

Reference

Resonance fluorescence 305 ±131 Rasmussen et a! (1961) Coulomb excitation 370 ± 96 Andreev et at (1961) Resonance fluorescencef 570 ±231 Booth et at (1964) DSA (x, x'y) 3 70: |I Robinson and Bent (1968) DSA (p.p'y) 397 ±75 Hausser et at (1968) DSA (p.p'y) 7A-1 +23* ,KJ - -1 41 de Kock et r?/ (1970) Recoil distance 305 ±131 McDonald et at (1971) DSA (x.py) 346 + 57J Durell et at (1972)

(e.e') 299 ± 29§ Present work

(6) Method Qo

(fm2

)

B(E2, t ) (e 2 fm4

)

Reference

(x.x ) 104 MeV ( t- )44 ± 3 193 ± 26 Rebel et at (1972) Reorientation ± 56± 14 311 ± 156 Schwalnt et al (1972) (+42± 14) (175 ± 1 17)

f A natural magnesium target used in this experiment.

t ±25% additional uncertainty in slowing down theory,

j Corrected for model dependence (see text).

Figure 1. Inelastic form factor for the 1-809 MeV, 2* level in 20 Mg. The full curve is the best-fit DWBA form factor.

*

PHOTONUCLEAR DATA SHEET 407

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
c. V. V. Varlamov, B.S. Ishkhanov, I.M. Kapitonov, Zh.L.

I.M. Piskarev, and 0. P. Shevchenko

ZhETF Pis. Red. 13, 170 (1973)

TETP T.Pff-PTfl MQ7A)

METHOD

Kocharova,

Mg

REF. NO. 73 Va 7

26 12

hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

G,P SPC 14- 30 C 32 SCD-D UKN

FORM N3S-418

(REV. 7-14- 64) USCOMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 408

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
^ c. r .

m

«

m

D.W. Anderson, R.F. Petry, and H.J. Fischbeck

Phys. Rev. C£, 1919 (1974) Mg 26 12

METHOD REF. NO.

74 An 1 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,P ABX 15-60 C 15- 60 ACT-I 4PI

%

7 CO

The cross section for the reaction J*Mg(y,p)25 Na has been measured from 15 to 60 MeV

using bremsstrah lung activation methods to obtain the yield curve. The peak cross section

of 15.7 mb occurs at 22.6 MeV. Prominent secondary maxima occur at 29.6, 49.0, and 57.9 MeV. The cross section integrated to 28 MeV is 80 ±9 MeV' mb. The cross section integrated

to 60 MeV is 161 ± 18 MeV mb. A discussion of our results and comparison with photoneutron

data for 2s Mg from other sources is given.

[NUCLEAR REACTIONS 26 Mg(y,p), £ = 15—60 MeV; measured bremsstrahlungl

yield; deduced <r(£) . J

FIG. 5. The Integrated cross section for the

‘ E Mg(y,/>) 25 Na reaction is displayed as a function of energy.

18

16 24 32 40 18 56 ENERGY ( MeV I

FIG. 3. The cross section for the 26Mg(y,p)25 Na reaction is shown.

FORM N8S-418

IR EV. 7-1 4-64) USC OMM-OC 260I0-PS4 PHOTONUCLEAR DATA SHEET 409

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

REF.

METHOD

E.W. Lees, A. Johnston, S.W. Brain, C.S. Curran,

W.A. Gillespie and R.P. Singhal

J.Phys. :Math.Nucl. Gen. 7_, 936 (1974)

EL EM. SYM. A z

Mg 26

REF. MO.

12

74 Le 4 egf

REACTION RESULT EXCITATION ENERGY

SOURCE detector

ANGLE

TV PC RANGE TYPE RANGE E,E/ LFT 1- 11 D 56-111 MAG-D DST

F (q) plots given 26 LEVELS

m

ft!

ft

ft

Table 2. Electron energies and angles employed in the present experiment.

Run

E,(MeV)

0

(deg)

</t L (fm* 1 )

1 95-74 120 0-84

2 110 71 120 0-97

3 8275 120 0-73

4 85-09 90 061

5 110-45 140 1 05

6 56-89 120 0-50

7 91-28 120 0 80

8 84 16 140 080

9 81-36 153 080

q

(fm ')

Figure 7. Inelastic form factors for the 2* level at 8-892 MeV (O', the 3" level at 6-876 MeV

i O) and the 4* level at 5-720 MeV ( x ). The full curves arc the corresponding best-fit mvBA

form factors.

= osm M3S-418 “EV. 4-841 JSCOMM-OC 26 01 0- P64

(over)

U.S. DEPARTMENT DC-.IMEPC; national BLPEAlCt ST. - -LANDS

m

PHOTONUCLEAR DATA SHEET 410
l

assie

model

Generalized

Helm

model

_r ,£ ST it

of I — JL

_ o

+1 ^ o — ^ —

— so r*i

+1 i* +1 £ i‘ -H

x +» ;t +1 -H 5 +1 +1 +l li -H + “??'92 -^? 2 ^S'06 i iT? r' 3? v?

r>

O ° -H - VO o o —

-H +1

X

n o - n

u - O «*> O Cv rM r*» ro Cv O n n n Tf n ri tj* OOOOOOO ©

-H-rl-H-H-H-H-H^.-1-f^. ^•Or'r^Ty^rsj'O'Orn O O' — O' ON M ^ M (N n

^rrn'Orn^r'orn«A»Ao

X

C4 co Ac — O v -H -H ^ n tt Cl- *t ro o o o ^

-H -H -H?o+1 -H

Oi ro -H +1 o o

+1 +1 o o O C[» "A VO vf 30 I n ri rj tT rr =•: <

'•*• rr

m

ir. o o

?, +1 -H

v? vr o « vo Trfnnovf^ n ri wi r, n

O Tt v-v o O

— 30

O <"">

m vo o »—i m

>0

m o vr* o o o o _

__

-f! ^ +1 -H -ft *7 -H -H 0 -co'nr'rin--w-iTrcvfNri '0 cvr^ — r-Trm—cvOvrsJr->r''— mo+1 +1 -H -H -H -H -H . o o — . -H +! +1 m m ry ov O +17 . ro oo

OO ~ +1 +i — r^i —.

o. . oi vo 04

mm

m vo

m

n 04m I J

r-> <cv r- o — rr

+1 +1

r-* oo — O

mryvo

——• — Orreerr Cvrorroj — m-»rrs.rr —

+•

© + O

— «+

O

O©

r I O rf r^*

mm «om

*r o r-

— *r cv c*> ri r» »/\ co O — ri OOOOOOO

rr >3 CN o o o o o

»*• *0 O O 7T +• f Cv A Cv O rr r. co

v~i ri -— vo o «“"i o — co so m m O OOOOOOO

+1

O ’ rr rr . S I o o roo ry ry m vn vo n ri ri

vo

—

r-

—

rrO

—

VO

— -+ — C4 m r^- «o — O' »r <^v

ov rr cv r> o ^ — —

rr

mmm

ri oin o« „ ff

r*l oi

O r-i 'TO rr rr o r-“.

ov vo cv r- vo cv -r o o o o r m — r» n -T rv ri M

VO VO VO

O

O r- r- r*

mmmrNirir.C'*

—

—

O

— Ooir-OCv Cv^ 0O<'»C'>0 'OO'

so CO

— vo >0

r i CO

—

CO CO CO Cv Cv

O

ri - r in

n

m 'T so o co cv o o o o o o 5 %

‘-•S -0 i c

%, « c «v

C

—

O

W o o g

>.B .?|o

CP i;

y - y J §5 r* 2 — c X> Z M'to r-s s 5 « £ Z s

"3

y ^ ^ o S - £

"5 « il|i | IHs! y n o o .Q n *— _ - _ » — ° « L - “ M i v2 ^ 2 c - U p > g J 5" d {S of > 4- •*• i= SF=

411

Hppppppppppppppppp
REF. C.L. EM. a r Mm

«

«

«

i

m

M

t

i

i

V.V. Varlamov, B.S. Ishkhanov, I.M. Kapitonov, I.M. Piskarev,

V. G. Shevchenko, and 0. P. Shevchenko

Nucl. Phys. A222 . 548 (1974) Mg 26 12

METHOD REF. NO.

74 Va 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGE TYPE RANGE

G,XP ABX 15- 29 G 8- 29 ION -I 4PI

. f , * 20 25 ErheV)

-i 1 1 I 1 l .

! I I ! l » ' 1

Fig. 2. The !s Vfg(y, .rp) reaction effective cross section.

form N3S-418

(R EV. 7-1 4- 64) USCOMM-OC 26010-P64 PHOTONUCLEAR DATA SHEET 412

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

H. Wolf, R. Stock, U.E.P. Berg, and K. Wlenhard

Nucl. Phys. A234, 365 (1974)

m

m

m

REF. EL EM. SYM. A Z

METHOD

Mg

REF. MO.

26 12

74 Wo 5 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE TYPE RANGC type range

G.P ARY C 24. 31 TEL-D DST

G.A ABY 16- 23 C 24. 31 srn-n pn

Assumes all ground-state transitions to obtain a cross section. The total ground-state

cross sections used to obtain the integrals given in Table 2 were obtained by assuming

that the angular distribution measured for presumed ground-state protons produced by

22.1 MeV photons held for all photon energies below 23 MeV.

m

m

mb/sr

Proton Energy (over)

Fig. 3. The 2 ®Mg(j', p) proton spectrum obtained at 30.5 MeV brcmssiruhiung endpoint energy, showing a large excess of low-energy protons.

U.S. (DEPARTMENT OF CCMMtPCi

NATIONAL. SOREAUOF S T A N O A H D S 413
Table 2 Integrated and "bremsstmhlung-weighted" integrated proton and neutron cross sections

Excitation energy region of integration (MeV)

! <r(£)d£(MeV mb) f (<x(£)/£)d£ (mb)

(v. P) (y» ^loi) (y, p)+(y, n«i) (y, P) (y, n,oi) (y, p)-r (y, atot )

16.0-18.5 9.4 41.67 51.1 0.56 2.4 2.96 16.0-20.0 14.3 59.16 73.44 0.81 3.31 4.12

16.0-23.0 32.8 112.4 142.5 1.66 5.86 7.52

414
H. Wolf, U. Berg, and K. Wienhard

Phys. Lett. 50B , 244 (1974)

x

x

X

x

x

x

0

REF. EL EM. SYM. A Z

METHOD

Mg 26

REF. NO.

12

74 Wo 7 egf

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,NG ABI 19- 23 C 30 SCD-D 90

The population of T = 3/2 states in 25 Mg from the giant dipole resonance in 26 Mg was observed by the Mg ( 7. ny ) reaction. The previously reported result, that neutron decay between 18.9 MeV and 23.0 MeV

proceeds mainly to these states, could not be confirmed. Therefore the isospin splitting of the giant resonance

of 26 Mg remains questionable.

MeV

Fig. 1. Energy levels of residual nuclei from the

i6 Mg (7, X7') reaction. The ( 7, n) + (7, 2n) curve and data points are from ref. [5].

’s.C. Fultz et al., Phys. Rev. C4 (1971) 149.

N3S-418

1 P E V . 1 4-04) jSCOMM.QC 26010-P64

U.S. DEPARTMENT DGmMERC £ NATIONAL. BUREAU O- STAVGAR3S

PHOTONUCLEAR DATA SHEET 415
'
m

m

*

EC

m

m

m

m

m

«

m

m

*

i

0

E. Kuhlmann , E. Ventura, J. R.

S . S . Hanna

Phys. Rev. Cll, 1525 (1975)

METHOD

Calarco, D. G. Mavis, EL EM. STM.

Mg 26 12

75 Ku 4 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE

A, G ABX 14- 24 D 5- 16 NAI-D DST

E, in^q (MeV) SEE ANALYSIS 79KU5

the E 2 phase relative to the El phase.

FIG. 7. (a) the extracted E 2 cross section converted

by detailed balance to the total E 2 cross section for the reaction 2SMg(y, a„)22Ne. (b) the excitation function (El + £2) at 9 = 130* for the reaction 2,Mg(y, a^Ne.

(c) the cross section for 2S Mg(y, n) obtained with monoenergetic photons (Ref. 15).

(over)

porm N3S-418 REV. 7-1 4-64) •JSC OMM-N BS-OC PHOTONUCLEAR DATA SHEET 416

U.S. DEPARTMENT OF COMMERCE

NATIONAL 0UREAUOF STAnOAROS
Ex in 26Mg

FIG. 8. The excitation function at 8 = 130* and the coefficients aj, Oj, and from a Legendre polynomial

fit to the angular distributions for the reaction

JZNe(a, y,)

26 Mg* (1.81 MeV). In this case the a, fluctu- ates about a value of —0.12 in contrast to the behavior

for :o Ne(a, ys ).

TABLE I. The averaged absolute cross sections a(a,yj and o(a,yi) for the reactions 20 Ne(af,y)24 Mg and

22 Ne(a, y)

26 Mg.

A£x (MeV)

20 'Se(a, <x(a,y0) 1

(Mb)

7)

24 Mg

ff(a,y t ) b

(Mb)

22 Ne(a,y) 26 Mg

fffar.y,,)

1 c(a,y 1 ) b (pb) (pb)

11.4-14.4 3.2 3.9 ... ... 14.4-17.8 3.1 4.8 9.2 8.6 17.8-20.2 3.6 9.6 3.0 4.5 20.2-23.8 0.6 1.3 0.9 2.8 23.8-26.0 0.4 0.6 * * * * * *

4 Angular distribution assumed to be of the form W,(S) = sin20.

b Angular distribution assumed to be isotropic.

14

15

19

27

R. C. Bearse et al., Nucl . Phys. All

6

, 682 (1968).

S. C. Fultz et al., Phys. Rev. C4_, 149 ( 1971 ).

0. Titze et al., Phys. Lett. 24B, 169 (1967;

A. Goldmann, Z. Phys. 234, 144 (1970).

0. Titze et al . , Phys. Lett. 31B, 565 (1970).

TABLE II. Summary of £2 strengths in 24>26 Mg(y, a0

) (see text) given in percent of the £2 sum rule [ Eq. (5)].

A£ J<J(EZ)/E z d£ A £ J

v%j(E2)/E 2 dE

Nucleus (MeV) <%) (MeV) C5)

24 Mg 12.0-22.5 11.8*1.0 0-22.5 120*30

26 Mg 15.0-21.4 6.0* 2.0 0-21.4 290* 80

TABLE HI. A comparison of the integrated £1 strengths found in various reactions in the GDR’s of 24 Mg and :s Mg. The strengths are given in percent of the £1 sum rule [ Eq. (4)].

(y. a) (y.Ao>* (v,*)

b (e, e’) c

Nucleus A £

(MeV)

J

a(El)dE

(%) A £

(MeV)

J

<j{E\)dE

<%) A £

(MeV)

j

a{E\)dE

j (%) A £

(MeV) J

a(£l)d£

(%)

24 Mg

26 Mg

14.6-20.6

14.8-21.0

0.33 0.70

15.5-23.0 3.3 . 16.5-28.0 11.0-28.014.0 58.0 16.0-22.0

14.5-28.0

30.0

48.0

4 Reference 14. c References 19 and 27.

b Reference IS.

417
REF.

METHOD

V.V. Varlamov, F.A. Zhivopistsev, B.S. Ishkhanov,

Izv. Akad. Nauk SSSR. Ser. Fiz. 39^, 131 (1975)

Bull. Acad. Sci. USSR Phys. Ser. 39 , 113 (1975)

A. V. Lukashev

EL EM. SYM. A Z

Mg

REF. NO.

26 12

75 Va 3 hmg

REACTION result EXCITATION ENERGY

SOURCE DETECT 0 R ANGLE

TYPE RANGE TYPE RANGE

G,P SPC 17- 32 C 32 SCD-D UKN

m

m

Fig. 1. Comparison of the results of the calculation with experimental data: a) experimental photoproton spectrum; b) calculated spectra

of the protons escaping at various stages of

the process involving linkages with more com- plex states: 1) (2p-2h) + (3p-3h) + (4p-4h)

2) (2p-2h) ; 3) (3?-3h) ; 4) (4p-4h)

FORM N3S-418

(REV. 7-1 4-64) USC OMM-N BS-OC PHOTONUCLEAR DATA SHEET 418

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
ReF- v.V. Varlamov, B.S. Ishkhanov, I.M. Kapitonov, Zh.L.

Kocharova, V.I. Shvedunov, and O.P. Shevchenko

Izv. Akad. Nauk SSSR, Ser. Piz. 3£, 1744 (1975)

Bull. Acad. Sci. USSR Phys. Ser. 39, 150 (1975)

METHOD REF. NO.

75 Va 4 hmg

REACTION RESULT EXCITATION ENERGY

SOURCE OETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,P SPC 14- 32 C 19- 32 SCD-I 90

EL EM. SYM.

Mg 26 12

Fig. 2 6 1. Spectra of photoprotons from Mg obtained for two

values of E^ax

: 24.5 MeV (a) and 22.0 MeV (b)

.

Fig. 2. Resultant distribution of AN (E, *) obtained for dif26 P f ferent excitation-energy bands of Mg: a) 22.0-27.0 MeV; b)

19.5-22.0 MeV.

form N3S-418

'REV. 7-1 4-641 USC OMM-N 0S-OC PHOTONUCLEAR DATA SHEET 41

9

U.S. CEPARTMENTOF COMMERCE

ational bureauof stanoards
m

m

m

H

m

m

m

m

m

m

m

m

m

REF. K. Bangert, U.E.P. Berg, G. Junghans, R. Stock, K. Wienhard,

H. WOlf

Nucl. Phys. A261, 149 (1976)

El. EM. SYM.

Mg 26 12

REF. NO.

76 Ba 2 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RAN GE TYPE RANGE G,PG ABY 15- 30 C 24, 30 SCD-D 90

c r Nr: ABY 12- 30 C 24, 30 SCD-D 90

Table 5 Results of the 24 Mg(y, *-/) experiment, giving “bremsstrahlung-weighted” integrated cross sections

in MeV • mb for the population of excited residual nuclear states

Bremsstrahlung endpoint energy (MeV

23.5 30.0

(a) 2SNa slates gs. 90 keV, (}, l)+ j 10.10*) ?

1069 keV, J

+ <1.9 <2.7

2914 keV, (|, |) + 0.8 1.0

(b) 13 Mg states

g-s. t* 35.93 ») 7 585 keV, *

+ <3.6 <3.5

974 keV, }* 4.0 3.2 f?) 1611 keV, i* 1.9 2.7 1965 keV, J* 1.1 2.1 2564 keV, i* 3.2 4.1 2801 keV, 2.0 2.8 3901 keV, (}, i)* 0.8 1.8 4354 keV, 1.7 1.63 (?) 4715 keV, 7 1.2 1.03 (?) 7784 keV, (|, J) + T = J 2.57 3.1 7864 keV, (i, |) + T= 1 0.3 0.35

(c) 1AMg states 1369 keV, 2* 0.8 2.6

(d) 22Ne states 1275 keV, 2* 1.6 2.03 Sum of observed (y, p) excited state cross section 2.7 3.7 Sum of observed (y, n) excited state cross section 22.37 26.35 . Proton yield ) 12.8

(y, n)+(y, np) yield ») 58.31 80.2

(y

2n) yield ") 7.2 25.22

Bremsstrahlung spectra normalized at 10.6 MeV.

*) Calculated from the data of ref. *).

") Calculated from the data of ref. 2

).

2 S.C. Fultz et al., Phys. Rev. C4, 149 (1971) ;R. A. Alvarez et al . , Phys.

Rev. C4, 1673 (1971)

4 H. Wolf et al., Nucl. Phys. A234 , 365 (1974).

FORM N3S-418

(REV. 7- t 4-641 use omm-n as-oc PHOTONUCLEAR DATA SHEET 420

U.S. DEPARTMENT OF COMMERCE

NATIONAL 3UREAUOF STANDARDS
K. Wienhard, K. Bangert, U.E.P. Berg, G. Junghans, R. Stock

and H. Wolf

Nucl . Phys. A280 , 109 (1977)

ELEM. SYM. A Z

METHOD

Mg

REF. NO. 26 12

77 Wi 1 egf

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,P ABX 16-24 C 24 TEL-D DST

(23.5)

Assumes all ground state transitions

Table 1 Integrated and “bremsstrahlung-weighted” integrated proton cross sections

Excitation energy region of integration (MeV)

Jcr(y, p)d£ (MeV • mb) J(o(y, P)IE)dE (mb)

16.0-18.5 14.8 0.88 16.0-20.0 22.1 1.26 16.0-23.0 52.0 2.64

c 02f

of -02r

0.2

r

of1

-0.2f

r

0.2f

-1—1—1—1—1—1—

r

a

3 t' "

r't it (t:

> .*

1 \ * V

t y.S

lA^4

.44

16 18 20 22

Er (MeV) Ey CMeV)

Fig. 2. Angular distribution coefficients.

Fig. 1. Some angular distributions of the 24 Mg(y, p) reaction. The solid lines through the data

points are Legendre polynomial fits as discussed in the text. The error bars represent statistical uncertainties only.

uscoMM-Nss-DC PHOTONUCLEAR DATA SHEET 421

U.S. OEPARTMENTOF commerce

NATIONAL BUREAU OF STANOAROS
B.S. Ishkhanov, I.M. Kapitonov, V.N. Orlin, I.M. Piskarev

v!l. Shvedunov, V.V. Varlamov

Nucl . Phys. A31

, 317 (1979)

m

m

m

m

REF.

METHOD

EL EM. SYM.

Mg 26

79 Is 2

12

hg

REACTION RESULT EXCITATION ENERGY

SOURCE DETECTOR

ANGLE

TYPE RANGE TYPE RANGE G,PJ ABX 14-27 C 19-27 MAG-0 UKN

\bstract: The energy spectra of photoprotons from “Mg have been measured with bremsstrahlung at

five values of the end-point energy £*“, namely, at 19.5. 20.5. 22.0, 24.5 and 27.0 MeV. Using the

difference spectra technique, we have determined the mam decay channels of the states of the giant dipole resonance (GDR) of “Mg. The photoproton spectra have been used to.obtam the cross

sections for the formation of the final nucleus of the “Mg(y,'p)“Na reaction in its various states. The magnitude of the configurational splitting of the GDR of “Mg has been estimated. Relevant

data from other studies have been utilized to calculate the isospin components of the GDR of “Mg within the framework of a combined model for the decay of the giant resonance, with

isospin taken into account. A new isospin interpretation of the cross sections for the photoproton and photoneutron reactions on the “Mg nucleus is proposed.

NUCLEAR REACTION “Mg(y, p). £= 19.5. 20.5, 22.0. 24.5. 27 0 MeV. measured

photoproton energy spectra: deduced a for different final states. Configurational and

isospin splitting of GDR discussed. Enriched target.

J=0+1 ,3,6

>0 — -T

| rn —

! -H -H -H -H » cm m

-2 ! UJ o in n

CM — —

-H +1 -H -H ^ — O

CM pv| — ©

-H -H

30 ©

© —

C. G. CL c.

Fig. 4 Results of the calculation of the partial cross sections for the photoproton reaction on “Mg.

(a) The cross section a solid curve: data of ref. "), dotted curve: data of ref. *). (b) The cross

section n..y.. (c) The cross sections (d) The sum of the cross sections a f p t -i-<T..j.. + ff.. 6

..; solid curve: data of ref. dotted curve: data of ref.

; ). (over)

form N3S-418

(REV. 7-14-64) USC OMM-N as-oc PHOTONUCLEAR DATA SHEET 422

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OP STANDARDS
Fig. I Spectra of photoprotons (arb. units) Fig. 2. Difference photoproton spectra (arb. from '“Mg obtained lor the various endpoint units). The dolled curves indicate the difference

energies ol the bremsstrahlung y-radiation £" photon spectra (£TM is the energy at the maxima).

423


*

DEFINITIONS OF ABBREVIATIONS AND SYMBOLS

Note: In this list definitions are given for various photoneutron

reactions in which the following symbols are used: N, NL, nN, SN and XN.

Corresponding definitions apply for reactions involving other nuclear particles

where the symbols N (neutron) is replaced by, e.g. P, D, T, HE, A etc. Where

unknown reactions result in the production of a specific radionuclide, the

chemical symbol and mass number is listed as the reaction product, e.g. a G,NA22

reaction in 59c 0 .

A alpha particle response function. Contrast

with D = discrete.

ANAL analy si s CCH cloud chamber

ABI absolute integrated cross-section

data CF compared with

ABX absolute cross-section data CHRGD charged

ABY absolute yield data. Often means cross-section per equivalent

CMPT Compton

quantum is listed. COIN coincidence, coincide

COINC

ACT measurement of induced radioactivity of the target COH coherent

ASM asymmetric, asymmetry CK Cerenkov

AVG average D deuteron or discrete. When

discrete, it is used to

BBL bubble chamber describe a photon source or

a detector response function.

BEL reduced electric radiative Contrast with C = continuous.

B ( EL

transition probability

DLTE energy loss

BF3 BF 3 neutron counter with moderator e.g., Halpern detector,

long counter

DLTQ momentum transfer

DST di stribution

BML reduced magnetic radiative

transition probability, B(ML) DT BAL detailed balance

BREAKS levels located by "breaks" in the

yield curve

E electron

E/ inelastically scattered

BRKUP breakup electron

BRMS bremsstrahlung E+ positron

BTW between EDST energy distribution or spectrum

C continuous. Used to describe a photon source or a detector E/N used only to indicate a coinci

dence experiment as in ( E , E/N
-J 0 m

mm

|Pppipp
N stands for any outgoing KE kinetic energy

particle measured in coincidence with an inelastically L may be an i nteger or zero scattered electron. Distin- that always follows a reaction

guish from eg., (E,N) which is product symbol. This is used

used to represent an electron to indicate transitions to

induced reaction when only the specific states in the residual

outgoing particle N is detected. nuclide. When the letter is

used as in (G,NL) the cross

EMU emulsions (photographic plates) section given is that for the sum of transitions to two or EXCIT excited more specific final states.

F fi ssion LFT excited state lifetime

FMF form factor LIM 1 i mi t

FM-1 inverse femtometers LV ,LVS level, levels

FRAG fragment LQD 1 iqui

G photon MAG magnetic spectrometer

G/ inelastically scattered photon MEAS measurement! s)

G-WIDTH gamma-ray transition width MGC magnetic Compton spectrometer

HAD hadrons, hadron production MGP magnetic pair spectrometer

HE ^He particle MOD moderated neutron detector not

He3 employing a BF 3 counter, e.g.

rhodium foil, Szil ard-Chalmers

I NT interaction, integral. reaction, 3 He, 6 Li reactions.

intensity GD loaded liquid scintillator,

etc.

INC includes

MSP mass spectrometer

ION ionization chamber

MULT multiple, multipole, multiplicity

ISOB i sobaric

MU-T used only in combination with G

ISM i somer to indicate a total photon

absorption cross section measureJ multiplicity of particle ment, i.e. (G,MU-T)

defined by following symbol

e.g. (G,PJN) with remark N neutron (see also XN and SN).

J = 2, 3, 5,

The notation (G,N) is used to

indicate a reaction in which only

JPI spin and parity of a nuclear a single neutron is emitted, i.e.

J-PI state the reaction that can, in many

cases, be measured by observing

K second multiplicity index, e.g. the radioactive decay of the

( G ,JPKN ) with both J & K posi- residual nuclide.

tive integers greater than 1
r r~

—

—— j1I . II|II888888II
nN where n is any integer. (G,nN) SN sum of neutron producing

indicates the sum over all reactions, cr( y,SN)=a(y ,N)

reaction cross sections in which + cr(y,NP) + a (Y , 2N ) + a(y,3N)

n neutrons are emitted. + etc.

NAI Nal(Tl) spectrometer SPC photon or particle energy

spectrum

NEUT neutron(s

SPK spark chamber

NOX no cross-section data

SPL spallation

P proton (see also XP)

STAT stati stical

PART parti cl e(s)

SYM symetric, symmetry

PHOT photon( s)

T triton

PI pion, usually written as PI+,

PI-, PIO to indicate charge TEL counter telescope

POL polarized or polarization THR threshold for reaction or threshold detector, e.g..

Q-SQUAR momentum transfer squared (q 2

) 29 Si(n,p) 29 Al.

RCL recoi

TOF time-of-fl ight detector

REL relative TRK tracks of particles or fragments observed in solid

RLI relative integrated cross- materials (glass, mylar, etc.)

section data

TRNS transi ti on RLX relative cross-section data

UKN unknown

RSP reaction spectrometer UNK

RLY relative yield data VIB vi brational

SCTD scattered VIR PHOT virtual photon(s)

SCD semiconductor (solid state) XH all neutrons, total neutron

detector yield, cr(y,XN) = cr(y,N) + 2 a (Y,2N) + 3a(y,3N) +ct(y,NP) + etc.

SCI scintillator detector other than

Nal, e.g., Csl, KI, organic

(liquid or solid), stilbene. He

XP all protons, total proton yield

a (Y,XP) = a(y,P) + a(y,NP) +

2cr(Y,2P) + etc.

SEP separation

XX reaction products defined in

SEP ISOTP separated isotope used XXX REMARKS

SIG SIGMA (cross section) YLD yiel d

429
- .

I1

;fl||

m

p

«

p

p

ip

P
4PI

999

a 4 tt geometry was used or a method like radioactivity or a total absorption measurement

products was determined.

The polarized particle is

indicated in REMARKS.

energy defined in REMARKS * or 0

indicates the measurement

involved beams or targets

that were either polarized

or aligned, or that the polarization of the reaction

symbols used to indicate that

the units associated with the

numerals on one or both sides

of the symbol in a specific

column are not MeV. The units

are defined in REMARKS.

m

m

m

m

n

«

t

II

IImnn

U5COUU.OC «941.O>0
pp
mmmmmQH*mmmammm

pi

pi

pi