High-Spin Proton States Observed in the Reactions ${}^{90}{Zr} (α, t) {}^{91}{Nb}$ and ${}^{92}{Mo} (α, t) {}^{93}{Tc}$ at 50 MeV

The reactions

{}^{90}{Zr} (α, t) {}^{91}{Nb}

and

{}^{92}{Mo} (α, t) {}^{93}{Tc}

have been investigated with a 50-MeV

α

-particle beam from the Berkeley 88-in. cyclotron. Comparisons are made with the results of (

{}^{3}{He}, d

) experiments on the same targets in order to locate high-spin (

l > 2

) levels in

{}^{91}{Nb}

and

{}^{93}{Tc}

. The

{}^{91}{Nb}

(4.18 MeV) and

{}^{93}{Tc}

(3.91 MeV) levels are probable

l = 4 or 5

levels, in contrast to the (

{}^{3}{He}, d

) results. A difference in

Q

values for the reactions

{}^{90}{Zr} (α, t) {}^{91}{Nb}

and

{}^{91}{Zr} (α, t) {}^{92}{Nb}

of 680 ± 25 keV yields a

Q

value for the reaction

{}^{90}{Zr} (α, t) {}^{91}{Nb}

of -14.643 ± 0.027 MeV, which is not consistent with the presently accepted mass excess of -86.750 ± 0.06 MeV for

{}^{91}{Nb}

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High-Spin Proton States Observed in the ReactionsZr90(α,t)Nb91andMo92(α,t)Tc93at 50 MeV