Cross sections have been determined for the production of the $J^{\pi }=1^{+}$ ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}_{}^g{}_{}{}^{}$ from the ${}_{}{}^{180}{}_{}{}^{}\mathrm{Hf}(p, n)$ reaction from measurements of $\gamma$ rays emitted following the electron capture and $\beta$ decay of this 8.1-h state. Total ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}$ production cross sections were determined from measurements of the thick-target ($p, n$) yield. Upper limits on the cross sections for the production of the long-lived $J^{\pi }=9^{-}$ ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}_{}^m{}_{}{}^{}$ were obtained by subtracting the ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}_{}^g{}_{}{}^{}$ cross sections from the total ($p, n$) cross sections. These measurements are compared with the results of a statistical-model evaporation calculation.

NUCLEAR REACTIONS ${}_{}{}^{180}{}_{}{}^{}\mathrm{Hf}(p, n)$, $E_p=6.5-9.0\mathrm{}$ MeV; measured total ($p, n$) cross section, ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}_{}^g{}_{}{}^{}$ cross section; deduced ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}_{}^m{}_{}{}^{}$ cross section; statistical model calculation. Enriched target. Ge(Li) detector. Neutron detector.

• Received 9 November 1981

DOI:https://doi.org/10.1103/PhysRevC.26.435