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14 декабря, 2021
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Present Situation of Data for LLFPs and MAs
Although accurate data of neutron capture cross sections are necessary to evaluate reaction rates and burn-up times, there are discrepancies among the reported data for the thermal neutron capture cross sections for LLFPs and MAs. As an example of MA, Fig. 5.1 shows the trend of the thermal neutron capture cross section data for 237Np: the discrepancies are about 10 %. Discrepancies between experimental and evaluated data still remain. As for LLFPs, e. g., 93Zr, Fig. 5.2 shows that there
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Fig. 5.1 Trend of thermal neutron capture cross section of 237Np from the 1950s |
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Fig. 5.2 Present situation of cross-section data for 93Zr |
are discrepancies between ENDF/B-VIL0 and JENDL-4.0 evaluations in the region of the thermal neutron energy. Thus, our concern was focused to remeasure the neutron capture cross sections of those LLFPs and MAs.