Calculation of the Spin- and Energy-Dependent Fission Widths for <SUP>233</SUP>U, <SUP>235</SUP>U, <SUP>239</SUP>Pu and <SUP>241</SUP>Pu from Channel Theory
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概要
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The spin- and energy-dependence of the fission widths are estimated for <SUP>233</SUP>U, <SUP>235</SUP>U, <SUP>239</SUP>Pu and <SUP>241</SUP>Pu from the channel theory of nuclear fission. The spin-dependent fission widths are deduced, by assuming the appropriate transition state spectrum, and the fission and capture cross sections are calculated with these fission widths. The results thus derived agree well with the experimental data which differ distinctively from nuclide to nuclide, and this is despite closely similar transition state spectra assumed for the different nuclides. This fact supports the validity of the spin-dependent fission widths derived from channel theory. The ratio Γ<SUB>f</SUB><SUP>(I-1/2)</SUP>/Γ<SUB>f</SUB><SUP>(I+1/2)</SUP> for the states due to <I>s</I>-wave neutrons are as follows: 2.5 for <SUP>233</SUP>U, 1.8 for <SUP>235</SUP>U, between 74 and 210 for <SUP>239</SUP>Pu and 2.4 for <SUP>241</SUP>Pu. The fission widths of <SUP>239</SUP>Pu are thus seen to have exceptionally strong spin-dependence compared with the other nuclides.
- 一般社団法人 日本原子力学会の論文
著者
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Kikuchi Yasuyuki
Department Of Ergonomics Chiba University
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KIKUCHI Yasuyuki
Department of Nuclear Engineering, Faculty of Engineering, University of Tokyo
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AN Shigehiro
Department of Nuclear Engineering, Faculty of Engineering, University of Tokyo
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