Status of Fast Neutron Nuclear Data for sup 239 Pu

摘要

Recent energy-averaged data (fission, total cross section, scattering and anti nu/sub p/) describing the interaction of fast neutrons with sup 239 Pu are discussed, with emphasis on neutron energies higher than the inelastic scattering threshold. The linkage between such experimental data and new theoretical calculations is described in context of their influence on a new revision to the ENDF/B-V sup 239 Pu evaluation. Results from this new revision are compared with other current sup 239 Pu evaluations. Incorporation of such information pertaining to neutron emission and anti nu/sub p/ in the new ENDF revision had a profound impact on calculations performed for fast critical assemblies. Such calculational results are presented with emphasis on systematic improvements achieved in eigenvalues and fission ratios. (ERA citation 10:035474)