Nuclear Data Standards

Work is reported on the results of an international effort to evaluate the neutron cross section standards. The evaluations include the H(n,n), 6Li(n,t), 10B(n,alpha), 10B(n,alpha1gamma), 197Au(n,gamma), 235U(n,f) and 238U(n,f) standard reactions. Evaluations were also produced for the non-standard 238U(n,gamma) and 239Pu(n,f) reactions. This effort was performed so as to include new experiments in the standards that have been established since the ENDF/B-VI standard evaluation was completed, and to improve the evaluation process. Evaluations were not undertaken for the 3He(n,p) and C(n,n) standards. These standards are carried over from ENDF/B-VI. The interest in standards above 20 MeV led to the extension of the 235U(n,f) and 238U(n,f) cross sections to 200 MeV. The 239Pu(n,f) cross section was also extended to 200 MeV. The general trend observed for the evaluations is an increase in the cross sections for most of the reactions from fractions of a per cent to several per cent compared with the ENDF/B-VI results.

SHIBATA K.;  TAGESEN S.;  VONACH H.;  HAMBSCH Franz-Josef;  CHEN Zhenpeng;  HOFMANN H. M.;  OH Soo-Youl;  BADIKOV S. A.;  GAI E.;  PRONYAEV V. G.;  SMITH D. L.;  HALE G. M.;  KAWANO T.;  LARSON N. M.; 

CARLSON A. D.; 

2007-02-15

OECD Nuclear Energy Agency, France

JRC36570