Levels in ${}_{}{}^{64}{}_{}{}^{}\mathrm{Zn}$ have been investigated via the ${}_{}{}^{51}{}_{}{}^{}\mathrm{V}({}_{}{}^{16}{}_{}{}^{}\mathrm{O},p2n)$ reaction with $E_{{}_{}{}^{16}{}_{}{}^{}\mathrm{O}}=36\mathrm{}-46$ MeV, and via the ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}({}_{}{}^7{}_{}{}^{}\mathrm{Li},2\mathrm{}n)$ reaction with $E_{{}_{}{}^7{}_{}{}^{}\mathrm{Li}}=18\mathrm{}$ MeV. Measurements were made of $\gamma$-ray singles and $\gamma -\gamma$ coincidence spectra, of $\gamma$-ray angular distributions, and of Doppler broadening of $\gamma$-ray lines. Level energies, decay modes, spins and parities, $\gamma$-ray branching ratios, $\gamma$-ray radiative admixtures, and lifetimes were extracted. Lifetimes of levels were also determined by the Doppler-shift recoil-distance technique. There is a strongly excited band with the highest member observed being a $6^{+}$ state at 3994 keV. There is some evidence for a second even-parity band and for an odd-parity band.

NUCLEAR REACTIONS ${}_{}{}^{51}{}_{}{}^{}\mathrm{V}({}_{}{}^{16}{}_{}{}^{}\mathrm{O},p2n)$ $E=36\mathrm{}-46$ MeV; ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}({}_{}{}^7{}_{}{}^{}\mathrm{Li},2\mathrm{}n)$ $E=18\mathrm{}$ MeV; measured $E_{\gamma }$, $I_{\gamma }$, $\gamma \left(\theta \right)$, $\Delta E_{\gamma }\left(\tau \right)$. ${}_{}{}^{64}{}_{}{}^{}\mathrm{Zn}$ deduced levels, $J$, $\pi$, $\delta$, $\gamma$ branching, lifetimes.

• Received 22 June 1977

DOI:https://doi.org/10.1103/PhysRevC.16.2259