Calculation of neutron cross sections on Nb for JENDL-4

Ichihara, Akira ; Kunieda, Satoshi  ; Shibata, Keiichi

Nuclear data of Nb in JENDL-3.3 were reexamined in the incident neutron energy range from 10 keV to 20 MeV toward JENDL-4. Cross sections, differential and double-differential cross sections were calculated on the basis of the nuclear reaction models such as the spherical optical model, the distorted wave Born approximation, the Kalbach preequilibrium model, and the Hauser-Feshbach statistical model. It was found that experimental neutron emission spectra were reproduced well by the present calculation compared with the JENDL-3.3 evaluations for emission energies 1 MeV. Calculated cross sections are almost consistent with the experimental data for total, elastic and inelastic scattering, (,), (,3), (,), (,), (,), (,), (,) and (,) reactions. An appreciable change from the JENDL-3.3 evaluation was not seen for the (,2) reaction, which was about 20% larger than the experiments for incident energies 14 MeV.