The $\gamma$ rays following the $\beta$ decays of ${}_{}{}^{88}{}_{}{}^{}\mathrm{Kr}$ and ${}_{}{}^{88}{}_{}{}^{}\mathrm{Rb}$ have been studied, using both large volume Ge(Li) detectors for singles and coincidence measurements and anti-Compton spectrometry for singles measurements. Level schemes for ${}_{}{}^{88}{}_{}{}^{}\mathrm{Rb}$ and ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}$ were constructed from the data and 74 of 81 $\gamma$ rays observed in the decay of ${}_{}{}^{88}{}_{}{}^{}\mathrm{Kr}$ were placed in the ${}_{}{}^{88}{}_{}{}^{}\mathrm{Rb}$ level scheme with 23 excited states. For the decay of ${}_{}{}^{88}{}_{}{}^{}\mathrm{Rb}$, all of the observed 27 $\gamma$ rays have been placed in the (well known) level structure of ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}$. Spin and parity assignments have been deduced from $\beta$-decay $log\mathrm{ft}$ values and $\gamma$-ray transition patterns. Possible shell-model interpretations are presented for the level schemes.

RADIOACTIVITY ${}_{}{}^{88}{}_{}{}^{}\mathrm{Kr}$, ${}_{}{}^{88}{}_{}{}^{}\mathrm{Rb}$ [from ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}(n,f)$]; measured $E_{\gamma }$, $I_{\gamma }$, $\gamma -\gamma$ coin. Ge(Li) detectors, Compton suppression. ${}_{}{}^{88}{}_{}{}^{}\mathrm{Rb}$, ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}$ deduced levels, $J$, $\pi$, $log\mathrm{ft}$. Mass-separated ${}_{}{}^{88}{}_{}{}^{}\mathrm{Kr}$ activity.

• Received 8 December 1975

DOI:https://doi.org/10.1103/PhysRevC.13.1577