Issue |
EPJ Web of Conf.
Volume 284, 2023
15th International Conference on Nuclear Data for Science and Technology (ND2022)
|
|
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Article Number | 08011 | |
Number of page(s) | 4 | |
Section | Nuclear Data for Reactors | |
DOI | https://doi.org/10.1051/epjconf/202328408011 | |
Published online | 26 May 2023 |
https://doi.org/10.1051/epjconf/202328408011
Simultaneous evaluation of uranium and plutonium fast neutron fission cross sections up to 200 MeV for JENDL-5 and its updates
1 Nuclear Data Section, International Atomic Energy Agency, A-1400 Wien, Austria
2 Nuclear Data Center, Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Tokai-mura 319-1195, Japan
* Corresponding author: n.otsuka@iaea.org
** Corresponding author: iwamoto.osamu@jaea.go.jp
Published online: 26 May 2023
Simultaneous evaluation of 233,235,238U and 239,240,241Pu fission cross sections for fast neutrons up to 200 MeV was performed for the JENDL-5 library. Experimental covariances were estimated for each experimental dataset of cross sections or cross section ratios extracted from the EXFOR library, and they were stored in an experimental database dedicated to the new evaluation. The cross sections were expressed by Schmittroth’s roof functions, and the values on defined incident energy grids were adjusted by the least-squares method to reproduce the experimental cross sections and their ratios. The newly evaluated cross sections were validated using the spectrum averaged cross sections measured in the 252Cf spontaneous fission neutron standard field. The evaluation adopted by the JENDL-5 library was further updated by addition of two datasets and deletion of one dataset.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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