Investigation of the level structure of ~(90)Nb nucleus using the shell model

摘要

Shell model calculations have been carried out for Nb-90 nucleus with the model space in which the valence protons occupy the f(5/2), p(3/2), p(1/2), and g(9/2) orbitals and the valence neutrons occupy the p(1/2), g(9/2), d(5/2), and g (7/2) orbitals. According to the calculated results, the negative parity is from the contribution of the proton of the f(5/2), p(3/2), and p(1/2) orbits. The moderate spin states of Nb-90 are mainly due to the excitation of protons from the f(5/2) and p(3/2) orbits to the p(1/2) and g(9/2) orbits across the Z = 38 subshell closure, and the high spin states arise from the excitation of a single neutron from the g(9/2) orbit into the d(5/2) orbit across the N = 50 shell closure.