Pb and Bi neutron data libraries with full covariance evaluation and improved integral tests

摘要

Important updates on the current JEFF-3.1 evaluated nuclear data files are presented for ~(204,206,207,208)Pb and ~(209)Bi for incident neutrons from thermal to 200 MeV. In order to keep the lead and bismuth isotope evaluations up to date regarding the latest measurements and the needs of the reactor community, (1) evaluated inelastic cross-sections are adjusted to take into account high resolution GELINA data for ~(206,207)Pb, (2) resonance parameters are modified for ~(204,206,207,208)Pb and ~(209)Bi; and (3) covariance files are added to the evaluations in the resonance and fast neutron regions for all lead isotopes and ~(209)Bi. Furthermore, to complete the evaluation of the lead isotope chain, the long-lived ~(205)Pb is also evaluated based on averaged resonance parameters and TALYS calculations. Finally, this new evaluation is validated with shielding and criticality benchmarks.