High-Spin Isomers in ${}_{}{}^{91}{}_{}{}^{}\mathrm{Nb}$ and ${}_{}{}^{91}{}_{}{}^{}\mathrm{Zr}$ via ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$-Induced Reactions

High spin levels in ${}_{}{}^{91}{}_{}{}^{}\mathrm{Nb}$ and ${}_{}{}^{91}{}_{}{}^{}\mathrm{Zr}$ have been studied with the reactions ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}({}_{}{}^6{}_{}{}^{}\mathrm{Li}, 3n){}_{}{}^{91}{}_{}{}^{}\mathrm{Nb}$ and ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}({}_{}{}^6{}_{}{}^{}\mathrm{Li}, p2n){}_{}{}^{91}{}_{}{}^{}\mathrm{Zr}$ by pulsed-beam-$\gamma$, $\gamma -\gamma$, and $\gamma -W\left(\theta \right)$ measurements. Isomers were found which agree with theoretical predictions: a $\tau =5.42\mathrm{}\pm 0.18$-μ sec state at 2035 keV in ${}_{}{}^{91}{}_{}{}^{}\mathrm{Nb}$, $|{\left(g_{\frac{9}{2}}\right)}^2{p}_{\frac{1}{2}}, {\frac{17}{2}}^{-}〉$, and a $\tau =6.15\mathrm{}\pm 0.50$-μsec state at (3183) keV in ${}_{}{}^{91}{}_{}{}^{}\mathrm{Zr}$, $|{\left(g_{\frac{9}{2}}\right)}^2\times d_{\frac{5}{2}}, {\frac{21}{2}}^{+}〉$. The $|g_{\frac{9}{2}}{p}_{\frac{1}{2}}{d}_{\frac{5}{2}}, {\frac{15}{2}}^{-}〉$ state in ${}_{}{}^{91}{}_{}{}^{}\mathrm{Zr}$ was located at 2288 keV by a 28.1-keV decay $\gamma$ ray.