CIELO.U-238 Evaluation by R. Capote: New Insights and Standards
CIELO.U-238 evaluation conducted by R. Capote and team covers various aspects such as resonance regions, cross-section analysis, and comparison with standard data. The evaluation involves fast neutron regions, fits for uranium reactions, and adoption of new standards. The process includes IAEA evaluation, ENDF data, benchmarking, and validation efforts. Updates on U-238(n,f) are provided along with information on neutron standards and evaluation processes.
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CIELO U-238 evaluation (RR+fast) R.Capote, A.Trkov, M.Sin, M.W.Herman, V.G.Pronyaev, E.Sh.Soukhovitskii, P. Schillebeeckx, I.Sirakov, S.Kopecky, D.Bernard, G.Noguere, A. Daskalakis, Y.Danon Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 1 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
n + 238U resonance region Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 2 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U(n, ) New Standard GMA fit vs IRMM data 1 238U(n, ) Cross section, b Standard (2006) data by Geel (20016) reduced to GMA bins and nodes Standard (2006) with Geel data Standards (2006) with all new data (as March 2016) 10 100 Neutron energy, keV Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 3 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
New Standard GMA fit 238U(n,g),197Au(n,g) vs Wallner AMS 238U(n,g)/197Au(n,g) 238U(n,g) kT=25 keV Wallner: 0.391 0.017 b (4.3%) GMA: 0.3939 b (+0.74%) kT=25 keV Wallner: 0.620 0.023 (3.7%) GMA: 0.6276 (+1.2%) kT=426 keV A. Wallner: 0.108 0.004 b (3.7%) GMA: 0.1078 b (-0.2%) kT=426 keV Wallner: 0.687 0.022 (3.2%) GMA: 0.6853 (-0.25%) Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 4 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
n + 238U fast region (En>150 keV) (n,f) and (n, ) from 2006 Neutron Standards (to be updated with new GMA Standard fit) PFNS adopted from Talou-Rising analysis (n,2n) feedback from CEA Cadarache and TUNL new data (Krishichayan et al) Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 5 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
IAEA evaluation process (no covar.) ENDF eval. (no covar.) RIPL Local input Res. Param. SAMMY, Phys. + EMPIRE (TALYS) Modeling codes Physics ! Benchmarking & Validation * YES NO Are measurements reproduced? diff. & clean int. ENDF file Assembly & Verification- Trial file Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 6 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U(n,f) Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 7 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
Empire 238U(n,f) vs ENDF/B-VII.1 238U(n,f) 238U(n,f) - ib46 = ENDF-B/VII.1=STD Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 8 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
Empire 238U(n, ) vs ENDF/B-VII.1 238U(n, ) - ib46 = ENDF-B/VII.1=STD Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 9 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U(n,el), 238U(n,sct) el+2 inel Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 10 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
in(tot), in (2+), in (4+) , in (1-) , in (3-)... 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 on238U nucleus Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 11 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
in(tot), new physics: EW, 21-CC OMP 238U(n,inl) SACS [235U(nth,f) PFN] ENDF-B/VII.1 257 41 mb U238-ib46 261 mb JEFF 3.1.2 261 mb Special thanks to T. Kawano, S. Hilaire Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 12 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
(n,2n) vs TUNL and SACS 238U(n,2n) SACS [252Cf(sf)] Blinov et al (corr) 20.6 2.2 mb ENDF-B/VII.1 21.35 1.9 mb U238-ib46 21.6 238U(n,2n) SACS [235U(nth,f) PFN] ENDF-B/VII.1 14.8 1.3 mb U238-ib46 14.8 mb JEFF 3.1.2 14.1 mb Frehaut 1980 still low after renorm. by 1.09 (possible PFN effect) Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 13 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
SACS(n,2n) confirmed by SACS ratio syst. 2.7 235U(nth,f) 252Cf(sf) SPA - Mannhart eval 235U(nth,f) SPA: Experimental Experimental Kobayashi & Kobayashi 1992 Mannhart 2008 eval Kobayashi and Kimura 1980 Zolotarev (integral re-evals) Mannhart IAEA TRS-273 ENDF/B-VII.1 2.4 2.1 252Cf(sf)/ 238U(n,2n) 1.8 235U(nth,f) PFNS 235U(nth,f) PFNS (CW2014) Trkov et al. 1.5 SACS ratio 238U(n,2n) SACS 252Cf(sf) exp. = 20.6 mb 235U(nth,f) ib46 = 14.8 mb 235U(nth,f) exp. = 18.4 mb 1.2 0.9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Effective energy E50% (MeV) Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 14 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
(n,2n), (n,3n), (n,4n) 238U(n,3n) SACS [235U(nth,f) PFN] ENDF-B/VII.1 75 10 b U238-ib46 JEFF 3.1.2 87 b 87 b Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 15 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
(n,2n) vs TUNL (above 10 MeV) Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 16 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
RPI exp. essential to define d2el/dEd Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 17 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U(n,el), En=700 keV, ang. distributions Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 18 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U elastic -bar Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 19 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U(n,el+2CC), angular distributions Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 20 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U(n,el+2CC), angular distributions Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 21 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
238U(n,el+2CC), angular distributions Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 22 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
Conclusions: 238U file almost ready Resonance range: New measurements and independent REFIT analysis lead to better RPs (bound states) Non-standard region below 20 keV and URR improved New Standard (GMA): excellent agreement with Wallner New fast evaluation with elastic/inelastic improvements PFNS adopted from Talou-Rising for all incident energies RPI quasi-diff. data - a big help for fast region Capture and fission in fast region from Neutron Standards Better multiple neutron emission (CEA Cadarache feedback, LANL feedback, inelastic + diff. TUNL data) Good agreement between B/VII.1 SACS and new eval. Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 23 Mini-CSWEG, 11-12 April 2016 LANL, Los Alamos, USA
