Abstract
Statistical reaction model including preequilibrium emission as well as Hauser-Feshbach type contributions was applied to calculate the excitation function for the (n, xn) and (n, f) reactions up to 22 MeV bombarding energy using computer code STAPREF. The level density parameters were kept constant in excitation energy. Smalll variations of the fission threshold and the level density parameters from nuclide to nuclide within the experimental errors make it possible to achieve quite satisfactory agreement with the compilated cross sections above 3 MeV. The theoretical description of the isomeric ratio and the cross sections as a function of the neutron energy for the237Np(n, 2n) reaction may help to give recommendations for the excitation functions. Rotational parameters and decoupling constants were also calculated for ground state deformation and extrapolated to transition state.
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