Study of theNb93(nres, γ)Nb94Reaction

Abstract

The high-energy $\gamma$-ray spectra following capture in one $s$-wave and three $p$-wave resonances in Nb have been observed with a Ge(Li) detector. The low-lying energy levels of ${\mathrm{Nb}}^{94}$ inferred from the data are consistent with those previously reported on the basis of ($d, p$) and low-energy ($n, \gamma$) data. From the observed decay properties of the intial states, the spin assignments for the resonances are inferred to be ${J_r}^{\pi }=5^{-}\left(35.8\mathrm{} \mathrm{eV}\right), 4^{+}\left(119.2\mathrm{} \mathrm{eV}\right), 4^{-} or 5^{-}\left(42.3\mathrm{} \mathrm{eV}\right), 3^{-} or 4^{-}\left(94.3\mathrm{} \mathrm{eV}\right)$. The distribution of partial radiative widths for the three $p$-wave resonances is consistent with that predicted by the statistical compound-nucleus model.