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In beam -ray spectroscopic investigations of the ^90Nb nucleus have been explored by employing the ^76Ge (^19F, 5n) ^90Nb reaction. Twenty-eight new transitions belonging to ^90Nb have been identified and placed in the proposed level scheme through the analysis of - coincidence spectra. Shell model calculations have been performed in the restricted (p₃/₂, f₅/₂, p₁/₂, g₉/₂) (p₁/₂, g₉/₂, d₅/₂, g₇/₂) configuration space, and compared to the new level scheme. According to the calculations, the newly observed 2614. 6 keV ray depopulating the (15₃^+) level at 4421. 2 keV is explicated as the breakup of the N=50 neutron closed shell, while the ray with 2774. 0 keV feeding the (13₁^-) level at 2812. 9 keV is interpreted as protons excitation across the Z=38 subshell.
Wu et al. (Mon,) studied this question.