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Report No.
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EXFOR-based simultaneous evaluation of neutron-induced uranium and plutonium fission cross sections for JENDL-5; Inputs and outputs

Otsuka, Naohiko*; Iwamoto, Osamu  

The neutron-induced fission cross sections were simultaneously evaluated for the JENDL-5 library for $$^{233,235}$$U and $$^{239,241}$$Pu from 10 keV to 200 MeV and for $$^{238}$$U and $$^{240}$$Pu from 100 keV to 200 MeV. Evaluation was performed by least-squares fitting of Schmittroth's roof function to the logarithms of the experimental cross sections and cross section ratios in the EXFOR library. A simultaneous evaluation code SOK was used with its extension to data in arbitrary unit. This report describes (1) construction of the experimental database, (2) selection of data points from TUD-KRI collaboration, (3) comparison with the evaluated cross sections in recent major libraries, and (4) impact of the $$^{235}$$U datasets published in 1970s.

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