The low-lying low-spin levels of ${}_{}{}^{94}{}_{}{}^{}\mathrm{Nb}$ have been investigated; these levels were populated via the ${}_{}{}^{94}{}_{}{}^{}\mathrm{Zr}(p,n\gamma ){}_{}{}^{94}{}_{}{}^{}\mathrm{Nb}$ reaction with a separated isotope ${}_{}{}^{94}{}_{}{}^{}\mathrm{Zr}$ foil target (96% ${}_{}{}^{94}{}_{}{}^{}\mathrm{Zr}$). Excitation functions of $\gamma$ rays were obtained at incident proton energies from 1.688 to 3.700 MeV. $\gamma -\gamma$ coincidences were observed at $E_p=3.0\mathrm{}$ MeV. The existence of additional levels at 301.5, 450.3, 666.2, and 785.0 keV has been established. Computed Hauser-Feshbach ($p,n^{\prime }$) cross sections have been fitted to experimental cross sections deduced from the $\gamma$-ray data with the resulting best-fit spin-parities: 140.4-keV level, $2^{-}$; 301.5, $2^{-}$; 334.2, $3^{+}$; 396.3, $4^{-}$; and 450.3, $3^{+}$.

NUCLEAR REACTIONS ${}_{}{}^{94}{}_{}{}^{}\mathrm{Zr}(p,n\gamma )$, $E=1.688\mathrm{}-3.700$ MeV; measured $E_{\gamma }$, $I_{\gamma }$, $\gamma -\gamma$ coincidence spectra. ${}_{}{}^{94}{}_{}{}^{}\mathrm{Nb}$ deduced levels, $J^{\pi }$. Ge(Li) detectors. Enriched target.

• Received 6 August 1975

DOI:https://doi.org/10.1103/PhysRevC.13.620