High-Spin Levels of ${}^{92, 93, 94, 95, 96}{Nb}$ and ${}^{94}{Tc}$ Populated with ( $α, d$ ) and ( $α, t$ ) Reactions at 50 MeV

The reactions

{}^{91, 92, 94}{Zr} (α, t) {}^{92, 93, 95}{Nb}

{}^{90, 91, 92, 94}{Zr} (α, d) {}^{92, 93, 94, 96}{Nb}

, and

{}^{92}{Mo} (α, d) {}^{94}{Tc}

have been investigated with a 50-MeV

α

-particle beam from the Berkeley 88-in. cyclotron. High-spin proton excited states observed in the (

α, t

) reaction, based on comparisons with (

{}^{3}{He}, d

) experiments on the same targets, include:

{}^{92}{Nb}

(≅5 MeV multiplet);

{}^{93}{Nb}

(1.08, 1.29, ≅4.5 MeV); and

{}^{95}{Nb}

(1.27, 1.65, 2.10 MeV). Two groups of strongly excited states appear in the (

α, d

) data. Members of the lower group [

{}^{92}{Nb}

(g.s.),

{}^{94}{Nb}

(0.08 MeV), and

{}^{96}{Nb}

(0.23 MeV)] have been previously identified as being

{(π g_{\frac{9}{2}}, ν d_{\frac{5}{2}})}_{7^{+}}

states. Based on the

{}^{92}{Mo} (α, d) {}^{94}{Tc}

results, the

{}^{94}{Tc}

ground state can also be assigned

7^{+}

. The higher levels [

{}^{92}{Nb}

(2.58 MeV),

{}^{94}{Nb}

-(2.42 MeV),

{}^{96}{Nb}

(2.38 MeV), and

{}^{94}{Tc}

(2.68 MeV)] are believed to be either

{(π g_{\frac{9}{2}}, ν g_{\frac{7}{2}})}_{8^{+}}

{(π g_{\frac{9}{2}}, ν h_{\frac{11}{2}})}_{10^{-}}

states based on the results of shell-model matrix-element calculations and the (

α, d

) structure factors of Glendenning.

This publication has 35 references indexed in Scilit:

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