The excitation functions and Isomer ratios for neutron-induced reactions on 92Mo and 90Zr

Abstract

Absolute cross sections of the reactions 92Mo(n, 2n) 91m,91gMo, 92Mo(n, p) 92Nb and 92Mo(n, α) 89m, 89gZr, relative cross sections of the reaction 90Zr(n, 2n) 89mZr and isomer ratios of the 90Zr(n, 2n) reaction have been measured in the neutron energy range 13–15 MeV. The results for the (n, 2n) reactions are in good agreement with those of the previous studies. The present results for the (n, p) and (n, α) reactions are in disagreement with the previous works. The experimental data are analysed by the statistical model to determine the level-density parameter a, the moment of inertia ∲ and the strength of the γ-ray transition S l in order to simultaneously reproduce the experimental data on the excitation function and the isomer ratio in the (n, 2n) reaction. The γ-ray competition, the yrast level and the experimental information on the excited levels of the residual nucleus in the (n, 2n) reaction are taken into account. The obtained values of a, ∲ and S l are consistent with those deduced from other types of nuclear data.