The decay of ${}_{}{}^{61}{}_{}{}^{}\mathrm{Cu}$ to levels of ${}_{}{}^{61}{}_{}{}^{}\mathrm{Ni}$ and the decay of ${}_{}{}^{67}{}_{}{}^{}\mathrm{Cu}$ and ${}_{}{}^{67}{}_{}{}^{}\mathrm{Ga}$ to levels of ${}_{}{}^{67}{}_{}{}^{}\mathrm{Zn}$ have been studied in detail. The half-life of ${}_{}{}^{67}{}_{}{}^{}\mathrm{Ga}$ is measured to be 3.261 ± 0.001 days. Also, absolute intensities are reported for the $\gamma$ rays from the decay of ${}_{}{}^{67}{}_{}{}^{}\mathrm{Ga}$. Transition probabilities are calculated for ${}_{}{}^{61}{}_{}{}^{}\mathrm{Ni}$ using a shell model and a modified surface $\delta$ interaction.

RADIOACTIVITY Chemically separated sources; measured $E_{\gamma }$, $I_{\gamma }$, deduced ${}_{}{}^{61}{}_{}{}^{}\mathrm{Ni}$ and ${}_{}{}^{67}{}_{}{}^{}\mathrm{Zn}$ levels $J$, $\pi$; Compton suppression.

• Received 9 May 1977

DOI:https://doi.org/10.1103/PhysRevC.17.1822