EXFOR-based simultaneous evaluation for neutron-induced fission cross section of plutonium-242
Abstract
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 Pu fission cross sections from our evaluation and JENDL-5 evaluation are close to each other below 1 MeV while systematically differ from each other above 10 MeV. The cross section from our evaluation is systematically lower than the JENDL-4.0 cross section in the prompt fission neutron spectrum peak region (5% lower around 1 MeV). The newly evaluated Pu fission cross section was verified against the cross section measured in the Cf spontaneous fission neutron field and criticalities of small-sized LANL fast systems, and demonstrated better performance than the JENDL-4.0 cross section on the same level with the JENDL-5 cross section.
Keywords
Cite
@article{arxiv.2309.07489,
title = {EXFOR-based simultaneous evaluation for neutron-induced fission cross section of plutonium-242},
author = {Riko Okuyama and Naohiko Otuka and Go Chiba and Osamu Iwamoto},
journal= {arXiv preprint arXiv:2309.07489},
year = {2024}
}
Comments
Submitted to Journal of Nuclear Science and Technology