鉄原子核の光学ポテンシャル・パラメタの半経験的決定と遮蔽計算用核定数への応用

概要

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A nuclear data analysis is carried out for an isotope ^<56>Fe by using Engelbrecht and Fiedeldy's optical potential. Values of parameters in the potential are chosen in the analysis so that one can improve agreement between calculation and experiment on angular distributions of neutron polarization at 24MeV and of differential cross sections for elastic scattering in high energies. On choosing the new values for the optical potential, following conditions are imposed: (1) Calculated results should be able to explain energy dependences of experimental data on total and elastic scattering cross sections in high energies in the sense of optical calculation. (2) Calculated results should be able to explain experimental data on neutron strength functions at lower energy limit. By using the obtained new values for the optical parameters, neutron cross sections of inelastic scattering, (n, p) reaction, (n, 2n) reaction and (n, α) reaction are calculated. Agreement between calculation and experiments is fairly good in high energy region. Energy range for the cross section analysis is from 500KeV to 14.5MeV. Obtained values of the optical parameters are as follows; r^^-_<S0>=1.07f.m., r^^-_S=1.390f.m., a_2=0.7f.m., r^^_0=1.286f.m., V_<S0>=6MeV.
独立行政法人海上技術安全研究所の論文
1975-10-31