The AGATA CAMPAIGNat LNL
Daniele Mengoni
Università and INFN Padova – ITALY

for the AGATA collaboration
ARIS – Advances in Radioactive Isotope Science 2014
1th- 6th June 2014, Tokyo - Japan

Advanced Gamma-ray Tracking Array
2009 LNL
24135

 5TC

 PRISMA EFF~6%~2014 GANIL
2012 GSI
 15 TC
 8TC
 FRS

 EFF>10%

 VAMOS EXOGAM
 EFF~20%

The first implementation of AGATA installed at LNLPRISMA: Tracking Magnetic Spectrometer
MCP Start Det.: X,Y & TI

MWPPAC X,Y & TF

10 sect.

6m TOF Large acceptance  = 80 msr
 Z/Z  1/60 (Measured) IC EnergyA/A  1/190 (Measured) Acceptance ±20%
 Max. B = 1.2 T.m.

Ionisation Chamber E - E

DIFFERENTIAL RDDS MEASUREMENTS AT LNL
76Ge + 238U 577 MeV
72Zn (-2p-2n)

Spectra at 50 kHz/capsule counting rate

E’
E’

bef~10%RDDS
measurement
G=55ºAGATA-PRISMA

E

aft~8.5%

IKP University Köln
TU Darmstadt
PLUNGERELNL EXPERIMENTS: 20 exps, 148 days, 3500 hs

 LIFETIMESIII ISLAND OF INVERSION AT N=40

LIFETIME

64Ni @ 460 MeV (TANDEM+ALPI)

238U target of 1.35 mg.cm-2 + 4 mg.cm-2 Nb Degrader

TKEL gate to reduce side feeding

1.4

Co
11/2 ®7/2 1674 keV

10.8
0.6
0.4

N/N0Inversion of 9/2- and11/2- in 65Co agrees
with the LSSM LNPS
interaction results.
Due to the 66Ni
Quadrupole - f7/2
weak coupling63a)

1.20.265b)

1.1

Co
11/2-®7/2- 1480 keV

0.9
0.7
0.5
0.3
0.1
01

F. Recchia et al., PRC 85, 064305 (2012), V. Modamio et al., PRC 88, 0443265 (2013)

234Time (ps)567

RESULTS ON 70,72,74Zn
 72ZnLIFETIME

Qval gate 2+:maximum
collectivity at N=42

Good agreementwith previous results
4+: disagreementwith previous results
Not reproduced byLSSMLowest B(4/2)<1B(4/2) ~ seniority:

C.Louchart et al., PRC 87, 054302 (2013)

14N(p,γ)15O REACTION CROSS SECTION

13C

(p,ϒ)

(p,α)

17O

(p,ϒ)

β+

13N

14N(p,γ)15O

is the“bottle neck”

15O

(p,ϒ)

12C

14N

(p,α)

β+

15N

(p,ϒ)

LIFETIME- 507 keV

16O

Captures to different excitedstates in 15O contribute to theΓγ (6792 keV) =cross-section.
The one to the gs in 15O isdominated by the tail of the subthreshold resonance at-507 keV (6.79 MeV state in 15O)
C.Angulo et al., NP A690 (2001) 755,
M.Marta et al., PR C78 (2008) 022802(R)

1.0 eV
0.8 eV
0.6 eVpossible solution for the“solar composition problem”
A.M.Serenelli et al., As.J.Lett. 705 (2009)

LIFETIME MEASUREMENT of 6.79 MeV in 15O
14N(2H,n)15O

and 14N(2H,p)15N reactions @ 32 MeV (XTU LNL Tandem)
Direct lifetime measurement with 4 ATCs at backward angles (close to the beam-line)

0 fs

With a tracking
1.1 fsarray, detectedgamma-rays can4 fs
be sorted in fewdegrees θ “slices”
with a continuousdistribution

15O 6.79 MeV

τ??

C. Michelagnoli et al., EPJ WoC, INPC 2013source(*)
15N 7.3 MeV

τ=0.65 fs(*)
15N 8.3 MeV

τ=2 fs BINARY PARTNER

SHAPE TRANSITION IN THE OS ISOTOPESBINARY P

Shape transition from prolate tooblate deformed nuclei in the Osisotopes
 194Os suggested to be prolate
198Os shows oblate character Binary Partner Method
 82Se(198Pt, 196Os)84Kr @ 426 MeV
Detect lighter beam-like recoil inPRISMA Reconstruct Spectrum for 196Os

SHAPE TRANSITION IN THE OS ISOTOPESBINARY P

 Yrast band measured for the firsttime
E(4+)/E(2+) close to 2.5 (γ-softnucleus)

P.R.John et al., submitted to PLB

 State of the art symmetry
conserving configuration
mixing (SCCM) calculations
performed(T.R. Rodriguez) 196Os is a transitionalnucleus HE REGIME

174W: ORDER-TO-CHAOS TRANSITION
High-Spin Fusion Evaporation
50Ti on 128Te @ 217 MeV, I ≥ 60
Loss of selection rules on K withtemperature

HIGH TEMP

4 Triple Clusters
2 and 3 folds:
2=30%, 3=10%(M = 30)

K–quantum number

K is robust at T=0(K-isomers …)

Goal: populate 174W at the highest possible spins(≥60ћ), in order to make the statistical fluctuation
analysis of the ridge-valley structures in the γ-γ
matrices, to estimate the number of low-K and high-K
bands and their correlation
V.Vandone et al., PRC 88, 034312 (2013)27 detectors: 5 clusters of BaF2(3”×3”, exagonal)
Total solid angle: 25% of 4π
Total efficiency: 16% @ 500keV

PHYSICS CASE

HIGH E. STATES

Nuclear Structure information from the Low Energy part of the Electric Dipole response

The relevant energy windowfor (γ,n) reactions in thestellar photon bathislocated in the vicinity ofthe PDR.

Pygmy Dipole Resonance

Giant Dipole Resonance
LOW ENERGYHIGH ENERGY

Inelastic scattering of 17O @ 20 MeV/u on different targets + -rays in coincidence

HECTOR+TWO EXPERIMENTS PERFORMED:
 Studied Nuclei: 208Pb 90ZrR. Nicolini (Università di Milano /INFN)
D.Mengoni (Università di Padova/INFN) Studied nuclei: 208Pb, 124Sn,140Ce
M. Kmiecik (IFJ PAN Kraków) ,F. Crespi (Univ. di Milano/INFN)

F.C.L. Crespi et al., PRL accepted

TRACE

PYGMY in 208Pb

HIGH E. STATES
N. Ryezayeva et al., PRL 89, 27 (2002) –previous NRF Experiment

208Pb(γ, γ’ )A. Tamii et al., PRL 107, 062502 (2011)208Pb(p, p’) One group of states with isoscalar character,the other with an isovector nature.
STRENGTH
This expoeriment

AGATA208Pb(17O,17O’γ)

 POLARITAZIONPOLARIZATION
104,108Pd

I.

COULEX TESTII.

NON-YRAST OCTUPOLE BAND
220Ra, 222Th (J.F.Smith , D.Mengoni)

III. POSITRONIUM ENTANGLEMENTβ+ source 22Na (P.G. Bizzeti)

PRELIMINARY RESULTS, COULEXPOLARIZATIONAGATA modules as Compton Polarimeters

Partially-polarized 555.8-keV and 433.9-keV lines
in 104Pd and 108Pd [+unpolarized 137Cs source].

GOSIA

Analyzing power: 0.48
P.G. Bizzeti et al., EPJ WoC, INPC 2013

SUMMARY AND CONCLUSIONS SUCCESSFUL TWO-YEAR LONG PHYSICS CAMPAIGN:LIGHT/HEAVY MASSES, HIGH SPINS AND LOW-LYINGPROPERTIES, ETC.

 PERFORMANCE OF THE AGATA DEMONSTRATORIS PROMISING, MOSTLY IN COMBINATION WITH
SEVERAL ANCILLARY DETECTORSACKNOWLEDGMENTS
Nuclear Instruments and Methods in Physics Research A 668 (2012) 26–58

and counting ….

 GALILEOJose Javier Valiente Dobon
Francesco Recchia
Daniele Mengoni
for the GALILEO CollaborationGALILEO: THE NEW INSTALLATIONph ~ 8%

P/T ~ 50%

 High efficiency and P/T High sustainable counting rate Holding structure LN2 filling system
 Beam line and beam dump
 Detectors tapered and triple

THE GALILEO (NEW AGATA) ELECTRONICS
 A fast low–noise charge sensitive preamplifier

based on the core–type AGATA preamplifier used for both tapered and triple cluster
detectors
 80 preamplifiers already available

 Digi-opt12: 12-channel 14/16-bit 100/125-MS/s
digitizer with optical output for
GALILEO/AGATA power consumption < 10 W /board
 Prototypes under test New low–power and low–cost readout
and preprocessing PCI–express boards
developed for GALILEO and AGATA
 Prototypes under test
33

ANCILLARY DETECTORSLight charged
particles detectors

Neutrondetectors

Binary reactions
fragment detectors
Lifetimemeasurement
Fast timingdetectors

Recoildetectors

High–energy
g–ray detectors

34

HECTOR
HECTOR+PARISABOUT PHYSICS: CALL FOR LoIs …
 GALILEO 0.0: GASP-TYPE STRUCTURE OF N~Z NUCLEI ISOSPIN SYMMETRY

DETs, DIGITAL ELECTRONICS TANDEM XTU – PIAVE –ALPI STUDY OF NEUTRON–RICH NUCLEI EXOTIC DECAY OF HIGH–SPIN STATES NUCLEAR STRUCTURE CLOSE TO 100SN

2nd workshop @ LNL
26-28 May 2014

 CLUSTER AND HIGHLY DEFORMED STATES IN SD–SHELL NUCLEI GIANT RESONANCES AND WARM ROTATIONS SYMMETRIES AND SHAPE–PHASE TRANSITIONS IN NUCLEI SHAPE COEXISTENCE IN NEUTRON–DEFICIENT NUCLEI
 g – FACTOR MEASUREMENTS MEASUREMENT OF ASTROPHYSICAL INTEREST CROSS SECTIONS– SURROGATE NR METHOD

(ALMOST) COMPLETE LIST OF EXPERIMENTS

Position Resolution from in-beam tests
30Si@70MeV + 12CBeam ray

30Si@70MeV + 12C

8Overall position resolution
for three detectors andtwo distances

7876Recoil
543P-A Söderström2 (Uppsala)F. Recchia (INFN-PD)
NIM A 638 (2011)1 96

POSITION RESOLUTION [mm]Position of first interactions atAGATA nominal distance

POSITION RESOLUTION [mm]

•

654Ra
RbGaGbBa
Bb

324 - 4.5 mm for E above
1 MeV (σ = 2 mm).

100

1000

2000

3000

ENERGY [keV]

4000

5000

1ATC PERFORMANCE FROM COMMISSIONING RUN

LSSMInteraction from
E. Caurier et al.
PRC 75, 054317

SHELL EVOLUTION IN Cu AND Zn ISOTOPESSystematic variation of effective single-particle energies due to the tensor interaction
T. Otsuka et al. PRL 95, 232502 (2005)

p5/2×2+ (A-1Ni) 7/2+A-1
p3/2×2 ( Ni) 7/2-17/2
f7/2)
LNL
f5/2
5/2
1/2
p3/2
3/2
-ISOLDE
Coulex ISOLDE
Inversion of the f5/2 with the p3/2 in 75Cu

71Cu
4273Cu44

presence of both single-particle andcollective states at low energy

Spokepersons: E. Sahin, M. Doncel, A. Goergen

75Cu
4677Cu48

S. Franchoo et al., PRL 81, 3100(1998),
I. Stefanescu et al., PRL 100, 112502 (2008) ,K. Flanagan PRL, 103, 142501 (2009),
J. M. Daugas PRC 81, 034304 (2010)

CHARACTER OF THE 7/2− STATE IN 71Cu
RDDS measurement: 76Ge (577 MeV) + 238U (1.5 mg/cm2), Degrader Nb 4.17 mg/cm2
p3/2×2+ (Ni)7/2f7/2)-1 7/2-1190 keV
981 keVp3/2 3/271Cu
42

τ=20+/-16ps
New approach for lifetime: normalization done with the number of ions (PRISMA)LNPS interaction: shell-model calculations using an enlarged valence space:pf-shell orbitals for protons and f5/2, p1/2, p3/2, g9/2 and d5/2 orbitals for neutrons.

LNL
ISOLDE
Analysis by M. Doncel, E. Sahin, C.Louchart

Complexwavefunctions
small changesin p3/2 & p1/2
occupancies

LSSM by K. Sieja et al.

SHAPE TRANSITIONS IN Os ISOTOPES
Ph.R. John, V. Modamio, Zs. Podolyak, C. Wheldon, W. Korten

Energy Density Functionals –D. Vretenar (Priv. Comm.)
Binding energy map βγ plane

ROTOR

P.D. Bond Phys. Lett. 130B, 167

g SOFT

Zs. Podolyàk et al. PRC79, 31305(R)C. Wheldon et al. PRC63, 11304

FIRST EVIDENCE OF 196Os
82Se + 198Pt (2mg/cm2) at 426 MeV

BLF: β~10% FWHM: 0.5%
TLF: β~3% FWHM: 1.8%

Analysis by P.R. John208Pb)
COULEX4242Ca ( SPECTRUM4242Ca+208
COULEX Ca ( spectrum Ca+ Pb)
K. Hadyńska-Klęk et al.,(Acta Phys. Pol B 42, 817(2011))

899

2424

COULEX 42Ca: SUPER DEFORMATION?
K. Hadyńska-Klęk et al., (accepted in Acta Phys. Pol B)
Zakopane Conference on Nuclear Physics 2012

Q2 nuclear shape invariants determined by using
the Quadrupole Sum Rules method