EVALUATION OF NEUTRON INDUCED REACTIONS ON 238 U NUCLEUS
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1 EVALUATION OF NEUTRON INDUCED REACTIONS ON 238 U NUCLEUS UN complex 1/27 Roberto Capote, NAPC - Nuclear Data Section, IAEA, Austria Andrej Trkov, Jozef Stefan Institute, Slovenia Mihaela Sin, University of Bucharest, Romania Michal W. Herman, NNDC, Brookhaven National Laboratory, USA Adam Daskalakis and Yaron Danon, Rensselaer Polytechnic Institute, USA Gilles Noguere and David Bernard, CEA Cadarache, France
2 +WPEC SG26 IAEA TM 2011 A.J. Plompen, T. Kawano and RC, Technical report INDC(NDS)-0597 ( IAEA,Vienna,2012) 2/27
3 Large compensations effects noted! Inelastic +522 LANL, USA Elastic -638 A.J. Plompen, T. Kawano and RC, Technical report INDC(NDS)-0597 ( IAEA,Vienna,2012) 3/27
4 IAEA TM recommendations 238 U(n,inl) 238 U(n,f) and 238 U(n, ) fitted in STD 238 U(n,γ) SPA in 252 Cf: 67.5 ± 0.7 mb (1.0%) 238 U(n,f) SPA in 252 Cf: ± 2.1 mb (0.6%) A.J. Plompen, T. Kawano and RC, Technical report INDC(NDS)-0597 ( IAEA,Vienna,2012) 4/ U is the ideal test nucleus for elastic/inelastic studies
5 DOES EVAL.FISSION AGREES with STD? ~2 238 U(n,f) SPA in 252 Cf = (0.6%) 5/27
6 DISCREPANCIES in 238 U(n,inl) ~2 6/27
7 Starting point: 238 U(n,inl) Discrete Lev. Continuum ~ 1.3 MeV 7/27
8 Nuclear Data Sheets 108 (2007) recent relevant modelling advances Dispersive Lane consistent coupled-channel OMPs*: 8/27 neutron inelastic scattering to discrete levels; CN-DIR interference effects (as predicted by Moldauer); neutron inelastic scattering to the continuum; improved fission formalism (descriptive capability) *J.M. Quesada et al., EPJ Web of Conferences (2013) J.M. Quesada et al., ND2013 conference
9 238 U DCCOMP: rigid rotor with soft-rotor corrections 9/27
10 cross sections [mb] new physics: DIR-CN interference Engelbrecht-Weidenmuller transformation [1] (n,el) dir-cn interference elastic 1 st level (44.9) 2 nd level (148) no interference elastic 1 st level (44.9) 2 nd level (148) 1000 (n,n 1 ) /27 energy [MeV] [1] C.A. Engelbrecht, H.A. Weidenmuller, Hauser--Feshbach theory and Ericson fluctuations in the presence of direct reactions, Phys.Rev. C8 (1974)
11 Using differential data 11/27
12 Neutron induced reactions on 238 U (n,el) (n,inel) (n,f) (n,tot) (n,g) (n,2n) 12/27
13 elastic -bar (P1 component) 13/27
14 Elastic angular distribution 720 kev impact on reflectors Elastic = SE + CE CSEWG: CE = MT50? 14/27
15 238 U(n,el) 238 U(n,scatt) 2.50 MeV 1.50 MeV 0.72 MeV 14.1 MeV 10.0 MeV 9.06 MeV 8.10 MeV 7.50 MeV 5.90 MeV 5.50 MeV 3.40 MeV 4.50 MeV 15/27
16 Inelastic angular distributions E n =1.5 MeV kev kev kev kev 16/27
17 total (and 1 st lev ) inelastic cross sections DCCOMP + mult. band coupling CN-DIR Interf. 17/27
18 Using quasidifferential data (see Y. Danon presentation) 18/27
19 Angle dependent cross sections: (n,f) (n,el) (n,n ) cont (n,2n) 19/27
20 RPI benchmark: /27
21 Using integral data k eff & RR 21/27
22 NEA ICSBEP criticality benchmarks 22/27
23 SPECTRAL INDICES BENCHMARK Relative Unc. [%]. JEFF3.1 JEFF3.1.1 IAEA ib25 IAEA ib33 23/27 F8/F5 MASURCA 1A MASURCA 1B CIRANO ZONA2A CIRANO ZONA2B MUSE4 (in the lead) SCHERZO Big U(n, ) PROFIL (12) PROFIL (23) PROFIL (29) PROFIL-2 (A11) PROFIL-2 (A26) PROFIL-2 (A39) 2.4% 2.0% 2.4% 2.8% 2.0% 1.5% 1.5% 0.5% 0.5% 0.5% 0.3% 0.3% 0.3% 238 U(n,2n) PROFIL-2 (B81) 2.8% ,934 sphere Pu (Russe) sphere Pu (LANL) sphere U5 (LANL) SCHERZO U5.56 Big-10 MSK MASURCA 1B PRE-RACINE 1 PRE-RACINE 2A PRE-RACINE 2B RACINE 1A 280 pcm 200 pcm 200 pcm 300 pcm 200 pcm 250 pcm 250 pcm 250 pcm 250 pcm 250 pcm EOLE UH , ,021 1,021 1,014 1,017 1,022 1, , ,974 1,015 1,019 1,
24 238 U(n,2n) 24/27
25 SUMMARY: new 238 U evaluation Better physics: Dispersive CC OMP coupling all levels up to E n =1 MeV Advanced Hauser-Feshbach treatment includes: CN anisotropy, direct effects on the CN emission Multi-humped fission barrier with absorption (fitted to STDs) Capture / fission follow 2006 IAEA STDs Elastic/Inelastic guided by new RPI quasi-integral data Improved performance: ICSBEP criticality benchmarks including Reaction Rates Better physics lead to improved performance! 25/27
26 CHALLENGES Apply learned lessons to fissile nuclei including: DCCOMP with multiple band coupling Advanced Hauser-Feshbach treatment Leading to changes in the elastic/inelastic scattering Impact of fissile PFNS on benchmarks Impact of new evaluation on other isotopes (interdependence of benchmarks) 26/27
27 Thanks for your attention! CIELO status * ~2016! (*) CIELO = heaven (in Spanish/Italian) 27/27
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