EXFOR-based simultaneous evaluation for neutron-induced fission cross section of plutonium-242

奥山 莉子*; 大塚 直彦*; 千葉 豪*; 岩本 修

Journal of Nuclear Science and Technology, 61(1), p.57 - 67, 2024/01

https://doi.org/10.1080/00223131.2023.2267070

The Pu neutron-induced fission cross section was evaluated from 100 keV to 200 MeV. The experimental Pu and U fission cross sections and their ratios in the EXFOR library were reviewed and analysed by the least-squares method. Additional simultaneous evaluation was performed by including the experimental database of the U and Pu fission cross sections and their ratios developed for JENDL-5 evaluation. The evaluated Pu fission cross section was verified against the cross section measured in the californium-252 spontaneous fission neutron field and criticalities of small-sized LANL fast systems. The newly evaluated fission cross section is systematically lower than the JENDL-4.0 cross section and demonstrates better performance.