High-Spin Levels ofNb92,93,94,95,96andTc94Populated with (α,d) and (α,t) Reactions at 50 MeV

The reactions $^{91,92,94}\mathrm{Zr}(\ensuremath{\alpha},t)^{92,93,95}\mathrm{Nb}$, $^{90,91,92,94}\mathrm{Zr}(\ensuremath{\alpha},d)^{92,93,94,96}\mathrm{Nb}$, and $^{92}\mathrm{Mo}(\ensuremath{\alpha},d)^{94}\mathrm{Tc}$ have been investigated with a 50-MeV $\ensuremath{\alpha}$-particle beam from the Berkeley 88-in. cyclotron. High-spin proton excited states observed in the ($\ensuremath{\alpha},t$) reaction, based on comparisons with ($^{3}\mathrm{He},d$) experiments on the same targets, include: $^{92}\mathrm{Nb}$(\ensuremath{\cong}5 MeV multiplet); $^{93}\mathrm{Nb}$(1.08, 1.29, \ensuremath{\cong}4.5 MeV); and $^{95}\mathrm{Nb}$(1.27, 1.65, 2.10 MeV). Two groups of strongly excited states appear in the ($\ensuremath{\alpha},d$) data. Members of the lower group [$^{92}\mathrm{Nb}$(g.s.), $^{94}\mathrm{Nb}$(0.08 MeV), and $^{96}\mathrm{Nb}$(0.23 MeV)] have been previously identified as being ${(\ensuremath{\pi}{g}_{\frac{9}{2}},\ensuremath{\nu}{d}_{\frac{5}{2}})}_{{7}^{+}}$ states. Based on the $^{92}\mathrm{Mo}(\ensuremath{\alpha},d)^{94}\mathrm{Tc}$ results, the $^{94}\mathrm{Tc}$ ground state can also be assigned ${7}^{+}$. The higher levels [$^{92}\mathrm{Nb}$(2.58 MeV), $^{94}\mathrm{Nb}$-(2.42 MeV), $^{96}\mathrm{Nb}$(2.38 MeV), and $^{94}\mathrm{Tc}$(2.68 MeV)] are believed to be either ${(\ensuremath{\pi}{g}_{\frac{9}{2}},\ensuremath{\nu}{g}_{\frac{7}{2}})}_{{8}^{+}}$ or ${(\ensuremath{\pi}{g}_{\frac{9}{2}},\ensuremath{\nu}{h}_{\frac{11}{2}})}_{{10}^{\ensuremath{-}}}$ states based on the results of shell-model matrix-element calculations and the ($\ensuremath{\alpha},d$) structure factors of Glendenning.