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1 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Nuclear data evaluation challenges
Roberto Capote
IAEA Nuclear Data Section, Vienna, Austria
2 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Thanks to: Organizers for the invitation
IAEA projects’ participants
Collaborators
o A. Trkov (IAEA)
o D.L. Smith (ANL, USA)
o D. Neudecker (LANL, USA)
o E. Soukhovitskii (JIENR, Belarus)
o J.M. Quesada (Univ. Sevilla, Spain)
o S. Chiba (Tokyo Inst. Technology, Japan) OM
P
P
FN
S
3 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Introduction
235U(nth,f) PFNS non-model evaluation
PFNS model evaluation challenges
Reaction modelling challenges
Evaluation methodology challenges
Challenges in use of integral data
Lessons learned on EXFOR compilation
Summary
OUTLOOK
4 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
IAEA contributions:
Neutron standards project
Actinide PFNS Coordinated Research Project
Technical work for actinide evaluations
e.g. OMP developments, 238U evaluation
Collaboration with BNL on 56Fe evaluation
5 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
PFNS evaluation
challenges
6 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
235U(nth,f) PFNS GANDR evaluation
Kornilov et al. (IRMM) data taken as reference
All data converted to 252Cf/235U or
235U/Mxw(1.32MeV) ratios
Upper energy cut-off 10 MeV
252Cf/235U or 235U/Mxw(1.32MeV) ratios integrated
over the overlapping interval for each experiment
Measured data normalised to match integrals over the
overlapping regions (data taken as shape data)
GANDR (GLSQ fit) with almost uninformative prior
Model independent evaluation (Neutron STD)
7 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
PF
NS
2
35U
(n,f
) /
Maxw
(T=
1.3
2 M
eV)
non-model evaluation for STD (GANDR)
Eaver(GANDR)= 2.000(9)
Eaver(B/VII.1) = 2.03
235U(nth,f) PFNS GANDR evaluation
8 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
PF
NS
2
35U
(n,f
) /
Maxw
(T=
1.3
2 M
eV)
non-model evaluation for STD (GANDR)
Eaver(GANDR)= 2.000(9)
Eaver(B/VII.1) = 2.03
235U(nth,f) PFNS GANDR evaluation
9 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
0.8% uncertainty
GANDR evaluation: uncertainty analysis
Non-model fit
)()( Y
10 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Challenges of PFNS model evaluation (I)
KALMAN (GLSQ) fit
Uncertainty increased
at 2 MeV
from 0.2% to ~2%!
Outgoing neutron energy [MeV]
M. Rising, P. Talou, T. Kawano, A.K. Prinja et al., NSE 175 (2013) 81
Model too rigid !!
Too few parameters
model fit
)()( Y
11 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
25
2C
f(sf
)/2
35U
(n,f
)
Energy [MeV]
235U(nth,f) PFNS GANDR evaluation
new expers
unlikely
12 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 150.9
1.2
1.5
1.8
2.1
2.4
2.7
3.0
Kobayashi 92
Mannhart
Kobayashi 80
Zolotarev
TRS 273 (Mannhart)
ENDF/B-VII.1
Trkov et al. CW2014
SP
A c
ross
-se
ctio
n R
AT
IO 2
52C
f(sf
)/2
35U
(nth,f
)
Effective energy E50% (MeV)
PFNS validation using dosimetry data
new expers.
needed !!
13 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
0.01 0.1 1 10
2.37
2.38
2.39
2.40
2.41
2.42
2.43
2.44
2.45
2.46
1st E
res
(0.27 eV)
p~0.3%
-1.0%
-1.6%
Gwin 84, set 1
Gwin 84, set 2
Gwin 84, set 3
Reed 72
Simon 73 (unc supressed)
Gwin 84, average, 3 sets
Divadeenam 82
(EVAL micr. = 2.4225)
Axton 86
(EVAL micr. = 2.4261)
ENDF-B/VII.1 (2.4208)
JEFF-3.2 (2.4199)
JENDL-4.0 (2.4205)
p
235
U(nth
,f)]
E[eV]
p
252
Cf(sf)] = 3.760
t=
p+
del
t
252
Cf(sf)]=3.7676
del
252
Cf(sf)]=0.008
thermal
point
+1.0%
235U nubar fluctuations
new expers.
needed !!
14 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Reaction modelling
challenges
15 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Reaction modelling challenges: (n,inl)
R. C., M. Sin, A. Trkov, M. W. Herman, D. Bernard, G. Noguere, A. Daskalakis, and Y. Danon.
NEMEA-7 proceedings, NEA SG-40 (2014) “Evaluation of neutron induced reactions on 238U nucleus”
16 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
0.1 1
500
1000
1500
2000
2500
3000 dir-CN interference
elastic
1st level (44.9)
2nd
level (148)
no interference
elastic
1st level (44.9)
2nd
level (148)
cro
ss s
ection
s [
mb
]
energy [MeV]
new physics: DIR-CN interference
Engelbrecht-Weidenmuller
transformation [1]
[1] C.A. Engelbrecht, H.A. Weidenmuller, “Hauser--Feshbach theory and Ericson fluctuations
in the presence of direct reactions”, Phys.Rev. C8 (1974) 859-862
(n,n1)
(n,el)
See Kawano talk
R. C., A. Trkov, M. Sin, M. Herman, A. Daskalakis, Y. Danon, Nucl. Data Sheets 118 (2014) 26-31
“Physics of Neutron Interactions with 238U: New Developments and Challenges”
17 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Kerveno et al, PRC87(2013) 024609 Bacquias/Kerveno et al (prelim., unpublished)
238U(n,n’ )
235U(n,n’ ) 5/2+-7/2 – (gsb)
3- - 2+ (gsb)
129.3 keV
Reaction modelling challenges: (n,n’)
Better structure models => CC OMP
See Kerveno talk
18 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Rigid rotor with soft-rotor (vibr.) corrections
U-238 (similar for 232Th)
Yu.V.Porodzinkij and E. Soukhovitdkii, Phys. At. Nuclei 59 (1996) 228-237
0.0 44.9 149.6
314.2 538.6
1166.9
(+8.4%)
822.8
(+6.0%)
~J(J+1)
rigid
non-axial
octupole
OMP with multiple band coupling gsb
19 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Rigid rotor with soft-rotor corrections
Odd nuclei: multiple-band coupling
7/2-, gsb 5/2+ 1/2+
13.
5/2+
7/2- - 21/2-
1/2 + - 13/2 + 5/2 + - 11/2 +
5/2 + - 7/2 +
235U; 4 coupled bands, 21 coupled levels
DOMP = 238U, different coupling scheme
isomer
(similar for 239Pu, 233U)
20 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Evaluation
methodology
challenges
21 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Unified Monte Carlo
1) MC modeling (EMPIRE, TALYS, CCONE, CoH,…) {σi}
2) For each random set {σi} we calculate L(yE,VE | σi)
L(yE,VE | σi) = exp{-(½)[(f (σi)–yE)T •( VE)-1 • (f (σi)–yE)]}
OUTPUT: 1)
2) Stochastic set {σi} (e.g. to be used in TMC)
jijiN
i
i
N
iii
w
w
),cov(,
)(
)(
1
exp
1
exp
)(exp
iw
jiji
),cov(,
UMC-B
Evaluation Methodology Challenges
22 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Alternatives to GLSQ evaluation: MC methods: No covariance generation needed UMC-B : Solution is obtained as a linear combination of model results However: The solution may not be reproducible by model calculations (additional information is derived from experimental data allowing to overcome potential model defects)
Evaluation Methodology Challenges
See e.g. Koning talk
Go beyond model calculations !
23 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Challenges in using
integral data
24 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Challenges in use of integral data
Cross-correlations among “reactions”: Elastic vs Inelastic (CS&DA) vs PFNS in fast assemblies -bar vs PFNS in thermal solutions Cross-correlations among isotopes: Big Ten, Flattop-25, Jemima fast critical assemblies 235U (, PFNS, fission, capture) vs 238U (capture, elastic and inelastic) Thermal solutions 235U, 233U, 239Pu (, PFNS, fission, capture) vs 16O & H (elastic)
25 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Lessons learned on
EXFOR compilation
26 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
Check EXFOR
PFNS @ En=500 keV, ANL experiment Measured: PFNS ratios 252Cf/233,235U; 252Cf/239,240Pu from 0.6-7 MeV
Fully determines the PFNS average energy <E>
Authors never provided the data, only the <E> shift (model dep.) !!
Excellent experiment !
… but not compiled
27 P(ND)2-2: 2nd International Workshop on Perspectives on Nuclear Data for
the Next Decade, 14-17 October 2014, Bruyères-le-Châtel, FRANCE
Roberto Capote, IAEA Nuclear Data Section
e-mail: R.CapoteNoy@iaea.org
Web: http://www-nds.iaea.org
PFNS evaluation challenges:
New methodology and PFNS models, uncertainty analysis
Reaction modelling challenges:
Use better structure in reaction calculations (e.g. CC OMPs)
Evaluation methodology challenges
Going beyond model calculations (e.g. UMC-B+TMC)
Challenges in use of integral data
Cross-isotope and cross-”reaction” correlations
EXFOR compilation challenges
Authors should provide measured (model indep.) quantities
(e.g. capture yields not RP, PFNS ratio not the <E> shift)
SUMMARY
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