Linear polarization measurements ofγrays fromZn64

The linear polarizations of ${}_{}{}^{64}{}_{}{}^{}\mathrm{Zn}$ $\gamma$ rays, produced in the ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}({}_{}{}^7{}_{}{}^{}\mathrm{Li}, 2n)$ reaction with $E_{{}_{}{}^7{}_{}{}^{}\mathrm{Li}}=18\mathrm{}$ MeV, have been measured with a Ge(Li) two-crystal Compton polarimeter. These polarization values were used with previously obtained $\gamma$-ray angular distribution measurements to make unique parity assignments for several states. The 641- and 1619-keV $\gamma$ rays have been found to be predominantly $E1\mathrm{}$ transitions, and odd parity has been assigned to the levels at 2999 keV ($3^{-}$), 3925 keV ($5^{-}$), 4635 keV ($7^{-}$), 4981 keV ($7^{-}$), and 5681 keV ($8^{-}$). Even parity assignments have been confirmed for levels at 991 keV (2+), 2736 keV (4+), 3994 keV (6+), and 4237 keV (6+). Also, the spin assignments for levels at 2307 keV (4+) and 4635 keV ($7^{-}$) have been confirmed.