Evaluation of Neutron Cross Sections of Carbon-12 for Energies up to 80 MeV
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We have evaluated the cross sections of <SUP>12</SUP>C for neutrons up to 80MeV, paying more attention to the intermediate energy range above 20MeV. For energies below 20MeV, the evaluated data of JENDL-3.2 were adopted with some modifications. In the energy range above 20MeV, total cross section and its covariance matrix were evaluated using a generalized least-squares method with available experimental data. The spherical optical model was used to evaluate reaction and elastic scattering cross sections. Inelastic scattering to the first 2<SUP>+</SUP> state was calculated based on the DWBA. The optical potentials used in these calculations were obtained by means of the microscopic folding model based on the Jeukenne-Lejeune-Mahaux theory. Double-differential emission cross sections for neutron, proton, deuteron, triton, <SUP>3</SUP>He, alpha-particle and other heavier products were calculated using the Monte-Carlo method by which three-body simultaneous breakup process and two-body sequential decay process were taken into account in n+<SUP>12</SUP>C multibody breakup reactions. Kerma factors calculated from the evaluated cross sections were also compared with measurements and other evaluations.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 34(2), 116-127, 1997-02-25
Atomic Energy Society of Japan