Neutron nuclear data evaluation for thorium-232.
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概要
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An evaluation was made on the neutron cross sections, resonance parameters and aver-age neutron yield in fission for <SUP>232</SUP>Th in the energy range from thermal energy to 20 MeV. The fission and capture cross sections were evaluated on the basis of the experimental data by converting the relative ratio data into cross section values by making use of recent evaluations for reference cross sections. The total cross section was determined from ex-perimental data in the region from 24 keV to 15 MeV and then extrapolated to lower and higher energies by using the optical model whose parameters had been adjusted as so to reproduce the measured data. The elastic and inelastic scattering, (<I>n, 2n</I>) and (<I>n, 3n</I>) reac-tion cross sections were calculated by means of the statistical model combined with the optical model. A set of resonance parameters were recommended in the energy range below 3.5 keV and average resonance parameters were deduced in the unresolved resonance region. A value of 7.40 b was chosen for the capture cross section at 0.025 eV, and the picket-fence negative-energy levels were introduced so as to reproduce the non-1/<I>v</I> behavior of the capture cross section in the epithermal region.<BR>The results were incorporated in the Japanese Evaluated Nuclear Data Library, Version 2 (JENDL-2). Comparison was made between the present and other evaluations such as ENDF/B- V and possible reasons for the discrepancy were discussed.
- 一般社団法人 日本原子力学会の論文
著者
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Ohta Masao
Department Of Nuclear Engineering Kyoto University
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Ohsawa Takaaki
Department Of Electric And Electronic Engineering School Of Science And Engineering Kinki University
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