In beam γ-ray spectroscopic studies of ${}_{}{}^{91}{}_{}{}^{}\mathrm{Mo}$ (up to 33/2ħ, 6 MeV) and ${}_{}{}^{89}{}_{}{}^{}\mathrm{Nb}$ (up to 29/2ħ, 6.5 MeV) are reported using fusion evaporation reactions with ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$ beams and enriched target of ${}_{}{}^{66}{}_{}{}^{}\mathrm{Zn}$. The level schemes are well described by spherical shell-model calculations involving neutrons and protons in 1${\mathit{g}}_{9/2}$ and 2${\mathit{p}}_{1/2}$ orbitals. The experimentally determined transition probabilities are in reasonable agreement with single particle transition probabilities (Weisskopf estimates).

• Received 14 April 1993

DOI:https://doi.org/10.1103/PhysRevC.48.1609