The $\gamma$ rays following the $\beta$ decay of mass-separated ${}_{}{}^{137}{}_{}{}^{}\mathrm{Xe}$ to levels in ${}_{}{}^{137}{}_{}{}^{}\mathrm{Cs}$ have been studied. Of 94 $\gamma$ rays observed, 83 were placed in a ${}_{}{}^{137}{}_{}{}^{}\mathrm{Cs}$ level scheme consisting of 34 excited states up to 3976 keV. The results are compared with levels from single-proton transfer reactions and shell-model calculations.

RADIOACTIVITY ${}_{}{}^{137}{}_{}{}^{}\mathrm{Xe}$ [from ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}(n, f)$]; measured $E_{\gamma }$, $I_{\gamma }$, $\gamma \gamma$-coin. Ge(Li) detectors; ${}_{}{}^{137}{}_{}{}^{}\mathrm{Cs}$ deduced levels, $J$, $\pi$, $log\mathrm{ft}$. Mass-separated ${}_{}{}^{137}{}_{}{}^{}\mathrm{Xe}$ activity.

• Received 9 December 1976

DOI:https://doi.org/10.1103/PhysRevC.15.1024