Present Status of JENDL-4

Keiichi SHIBATA
Nuclear Data Center
Japan Atomic Energy Agency

Contents• Purpose of JENDL-4• Code development for JENDL-4• Evaluation work for FP nuclei‣ JNDC FP Nuclear Data Evaluation WG• Evaluation work for light and medium nuclei• Time schedule• Issues probably carried over after JENDL-4
Nuclear Data CenterPurposes of JENDL-4
Hoc Committee on Next JENDL under JNDC
• AdInterviews
with specialists in various fields‣ LWR, FBR, Shielding, ADS, Fusion, Criticality Safety,-Radiation Damage, Medical Use, Astrophysics etc.

by the Committee in May, 2003
• ReportedDevelopment of innovative reactors‣‣ High burn-up and use of MOX fuel for LWR‣ Criticality safety with burn-up credit‣ Medical use, Astrophysics

A library with high quality and reasonable quantity
JENDL-4
Nuclear Data Center

Key Subjects for JENDL-4• To resolve open problems with JENDL-3.3• Improvements of FP and MA data
• Covariances• Gamma-ray production data
• FP yields• Various benchmarks• Quality assurance• Reactor constants
Nuclear Data Center

Nuclear Model Code Development• POD coded (Fortran) by A. Ichihara‣ Optical model, DWBA, exciton model, statisticalmodel for evaluation of FP‣ A report was published, but the code is still underdevelopment• CCONE coded (C++) by O. Iwamoto‣ Coupled-channel optical model, DWBA, excitonmodel, statistical model for evaluation of actinides‣ The code is still under development.

Nuclear Data CenterExample of POD Results
209

208

Bi (n,2n)Bi

1101010209

Bi

Cross Section (mb)

Cross Section (mb)10210

Bi (n, γ )0–1:Saito (2004):Voignier (1992):Budnar (1979):Csikai (1966)

1001010En (MeV)

13:Filatenkov (1999):Kong (1998):Ikeda (1996):Shen (1992):Frehaut (1980):Veeser (1977)

2051015En (MeV)
Nuclear Data Center20

Example of CCONE Results

Nuclear Data CenterEvaluation of FP Data

• 213 nuclei to be evaluated•

JENDL-3.3: 185 nuclei‣ newly evaluated: 28 nuclei‣ T ≥ 10 days, fission yield ≥ 0.1%
1/2

Low energy region (En = 10-5 eV - 100 keV)

‣ Resolved resonance parameters• High energy region (E = 10 keV - 20 MeV)n

‣ Optical model, direct-reaction model, pre-equilibriummodel, statistical model

Nuclear Data CenterPriorities for FP Evaluation• Needs from LWR, FBR, ADS• Availability of new differential measurements• Comparison of JENDL-3.3 total and capture••

cross sections with experimental data
Benchmark results of JENDL-3.3 on STEK
experiments
Results of data selection by WPEC SG21

Priority-A 63 nuclei
Nuclear Data CenterResolved Resonance Parametersfor FP Nuclei• Comparison of RRP obtained from exp.
• Determination of L and J• Check on calculated thermal cross sections••

and resonance integrals with Mughabghab 06
Comparison of energy-averaged crosssections
107 nuclei updated; 51 nuclei unchanged fromJENDL-3.3; 13 new evaluation; 42 no RRP
Nuclear Data Center99n - Tc‣ Same as JENDL-3.3

103‣ Adjust negative res.

Cross Section (b)•Gunsing+ (’00)

104• Thermal capture- Harada+ (’95 revised)- Molnar+ (’02)- Furutaka+ (’04)

Average 23.6±0.7 b
JENDL-3.3 22.76 b

10210110010-110-2 -21099

Tc(n,γ)Present Work
Kobayashi+ ('04)-1

01210101010Incident Neutron Energy (eV)
Nuclear Data Center118n - Sn‣ E , L, gΓ , cap. area
‣ cap. area → Γ‣ Upper limit: 15 keV
r

500

118

Sn(n,γ)nγ• JENDL-3.3‣‣ Upper limit: 4.8 keV‣ Unknown Γ
Mughabghab 81

400
Cross Section (mb)•

Wisshak+ (’96)

Present WorkJENDL-3.3
Wisshak1+ ('96)
Wisshak2+ ('96)

300

200

100

n- p-wave and reduced
width of 250 meVassumed05101520Incident Neutron Energy (keV)
Nuclear Data Center

157
n - Gd106

Leinweber+ (2006)‣ Capture & trans.
‣ Gd-152,154,155,156,157,158,160• Gd-157‣ 0.032-eV resonance‣ Thermal capture

Cross Section (b)•157105104Gd(n,!)
JENDL-3.3
RPI (2006)

2200 m/s
103- 10% smaller than

102

PENDING !!

10JENDL-3.3

110-2-1

010
10Neutron Energy (eV)101Nuclear Data Center

Optical Model Parameters for FP• Global parameters needed‣ Koning-Delaroche (2003)

Total cross section

spherical OMP → NOT
applicable to deformednuclei• New global CC parameters
applicable to a wide mass
range up to 200 MeV‣ Can be used for deformed
nuclei such as Sm

Nuclear Data Center

Low Energy Property of OMP
Newly Obtained
S-Wave Neutron Strength Function

Spherical parameters cannot reproduce exp.

Mass Number
Nuclear Data CenterEvaluation of FP in the NonResonance Energy Region• Finished‣ Zn, Ag, Sn, Nd, Pm, Tb, Dy• In progress‣ Mo, Nb, Pd, Sm

Nuclear Data CenterZn Cross Sections (1)Comparison of calculated
neutron strength functions withMughabghab 2006
@50 keV@100 keV70Zn(MeV)

Coupled-channel optical model
parameters for FP nuclei obtainedby Kunieda et al. (2006)

64Zn

66Zn

67Zn

68Zn

Nuclear Data CenterZn Cross Sections (2)Present
JENDL/A-96
JEFF-3.1/A

Nuclear Data CenterZn Cross Sections (3)Present
JENDL/A-96
JEFF-3.1/A

Nuclear Data CenterZn Cross Sections (4)Nuclear Data CenterNd Cross Sections (1)Present
JENDL-3.3
JEFF-3.1
ENDF/B-VII.0

Nuclear Data CenterNd Cross Sections (2)natNd(n,xn)

Nuclear Data CenterSn Cross Sections (1)Rayburn (63)112Sn(n,2n)

Betak+ (05)

Nuclear Data CenterSn Cross Sections (2)119Sn(n,p)

Nuclear Data CenterSn Cross Sections (3)124Sn(n,γ)

Nuclear Data CenterSn Cross Sections (4)Sn-126: LLFP T1/2 = 2.3×105 year(n,2n)

(n,p)

(n,γ)

Nuclear Data CenterSn Cross Sections (5)natSn(n,xn) at 14.1 MeV

Nuclear Data CenterEvaluation of Light and Medium Nuclei• Finished‣ Si-28, 29, 30‣ Ca-40, 42, 43, 44, 46, 48• On-going‣ Au-197• To be re-examined‣ H-1, O-16
‣ Cr, Fe, Ni

Nuclear Data CenterSi Cross Sections (1)Total Cross Section of natSi
4.0
5.0

Reproducibility at low enegies

4.0
3.0
Cross Section (b)

3.0
2.0

2.0

1.0
Foster+ (1971)
Perey+ (1972)
Schouky+ (1977)
Finlay+ (1993)
Koning-Delaroche
Present

1.0

0.0
0

50

0

5101520

Reproduced up to 200 MeV
100
Neutron Energy (MeV)

150

200
Nuclear Data CenterSi Cross Sections (2)1st excited state→ground state28

1.4

Si(n,n’!) E! = 2839 keV

0.8
0.6

Dickens (1970)
Murata+ (1988)
Hlavac+ (1999)
JEFF-3.1
ENDF/B-VII.0
JENDL-3.3Present calc.

0.15

Cross Section (b)1.0Cross Section (b)28Si(n,n’!) E! = 1779 keV
Lind+ (1961)
Mathur+ (1965)
Martin+ (1965)
Benetskiy (1965)
Dickens (1970)
Connell+ (1975)
Sullivan+ (1979)
Murata+ (1988)
Lashuk+ (1996)
Hlavac+ (1999)
JEFF-3.1
ENDF/B-VII.0
JENDL-3.3
Present calc.

1.2

2nd excited state→1st excited state

0.10

0.05

0.4
0.2

0.00

0.0
0

51015

Incident Energy (MeV)

2005

1015

Incident Energy (MeV)
Nuclear Data Center20

Si Cross Sections (3)280.7

Exp.1950s
Exp.1960s
Exp.1970s
Exp.1980s
Exp.1990s
Exp.2000s
JEFF-3.1
ENDF/B-VII.0
JENDL-3.3
Present calc.

0.6
0.5
Cross Section (b)Si(n,p)0.4

Exp. in 1950s

0.3
0.2
0.1
005

10
Incident Energy (MeV)

1520

Nuclear Data CenterCa Cross Sections (1)Nuclear Data CenterCa Cross Sections (2)Nuclear Data CenterCa Cross Sections (3)JENDL-3.3: normalized tothe data of Ikeda et al.

Nuclear Data Center

Time Schedule of JENDL-4
We are here!

FY2006Codes

FY2007

FY2009JENDL/ACcompleted
JENDL-4

Light Nuclei

FP + Medium Nuclei
Actinoid

Benchmark Tests

Actinoid FileJENDL-4 Release

FY2008

Data Modification

FY2005

FP Yields
Nuclear Data Center

Time Schedule of JENDL-4
We are here!

FY2006Codes

FY2007

FY2009JENDL/ACcompleted
JENDL-4

Light Nuclei

FP + Medium Nuclei
Actinoid

Benchmark Tests

Actinoid FileJENDL-4 Release

FY2008

Data Modification

FY2005

FP Yields
Nuclear Data CenterIssues Probably Carried Overafter JENDL-4• Thermal Scattering Law Data

‣ Difficult to find a specialist over the world• Resonance Analysis‣ Important, but raw data and expertise needed!

• Processing Code (NJOY etc.)‣ Necessary to keep specialists• (Nuclear Model Codes Made in Japan)‣ Resolved by JAEA activities

Nuclear Data Center