Estimation of double-differential cross-sections of Be(p,xn) reaction for new nuclear data library JENDL-5

Kunieda, Satoshi  ; Yamamoto, Kazuyoshi ; Konno, Chikara  ; Iwamoto, Yosuke   ; Iwamoto, Osamu  ; Wakabayashi, Yasuo*; Ikeda, Yujiro*

We have evaluated double-differential cross-sections (DDX) of the Be(p,xn) reaction based on the function proposed by Wakabayashi et al. up to 12 MeV. Through compilation in the ENDF-6 format file, data processing, and neutronics analysis with MC simulation codes MCNP and PHITS to thick target yield (TTY) measurements, the function was re-confirmed to give more reasonable DDX data than those in our previous library JENDL-4.0/HE and ENDF/B-VIII.0. We finally decided to reduce the absolute cross-sections by 15% for our new nuclear data library JENDL-5 since the prediction ability of neutronics simulation was much better than that based on the original function. Through comprehensive comparisons of the simulation results on TTY at different proton energies and neutron emission angles, we conclude that JENDL-5 gives the best estimation in the world.