Calculation of cross sections for metastable state production in the , , and reactions of Nb

Ichihara, Akira 

Toward the revision of Nb data in JENDL-4.0, we calculated cross sections for metastable state production in the , , and reactions in the incident energy range from 7 keV to 20 MeV. The cross sections were computed on the basis of nuclear reaction models (the spherical optical model, the multi-step statistical model, preequilibrium models, and the distorted-wave Born approximation). By adjusting the parameters in nuclear spin densities and the number of discrete states, we could obtain the metastable state production cross sections which were almost consistent with the measured data. The obtained NbNb cross section was in good agreement with the experiments in the incident energies below 10 MeV, in comparison with JENDL/A-96.