Decay ofZn80: Implications for shell structure andr-process nucleosynthesis

The decay of ${}_{}{}^{80}{}_{}{}^{}\mathrm{Zn}$ to levels in ${}_{}{}^{80}{}_{}{}^{}\mathrm{Ga}$ has been studied from mass-separated activity produced in the thermal neutron fission of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$. Based on γ singles and coincidence measurements, 26 γ rays were placed in a level scheme for ${}_{}{}^{80}{}_{}{}^{}\mathrm{Ga}$ with 13 excited states up to 2655 keV. The emission of a γ ray resulting from delayed neutron emission of ${}_{}{}^{80}{}_{}{}^{}\mathrm{Ga}$ is also reported. The structure of the ${}_{}{}^{80}{}_{}{}^{}\mathrm{Ga}$ level scheme is discussed. The properties of ${}_{}{}^{80}{}_{}{}^{}\mathrm{Zn}$ and ${}_{}{}^{80}{}_{}{}^{}\mathrm{Ga}$ reported here are of astrophysical interest for modeling the r process.