The decay of neutron-rich ${}_{}{}^{78}{}_{}{}^{}\mathrm{Zn}$ produced by the thermal neutron fission of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$ was studied with mass-separated sources. The decay scheme was deduced from $\gamma$ singles and coincidence measurements. The ${}_{}{}^{78}{}_{}{}^{}\mathrm{Zn}$ half-life was determined to be 1.47±0.15 s and 57 $\gamma$ transitions were placed in a level scheme for ${}_{}{}^{78}{}_{}{}^{}\mathrm{Ga}$ involving 19 excited states. The systematics of odd-odd Ga nuclides is discussed.

RADIOACTIVITY ${}_{}{}^{78}{}_{}{}^{}\mathrm{Zn}$ [from ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}(n, f)$]: measured $T_{\frac{1}{2}}$, $E_{\gamma }$, $I_{\gamma }$, $\gamma \gamma$ coin., Ge(Li) detectors; ${}_{}{}^{78}{}_{}{}^{}\mathrm{Ga}$ deduced levels, $J$, $\pi$, $log\mathrm{ft}$. Mass-separated ${}_{}{}^{78}{}_{}{}^{}\mathrm{Zn}$ activity.

• Received 17 June 1980

DOI:https://doi.org/10.1103/PhysRevC.22.2547