The directional correlation of coincident $\gamma$ transitions in ${}_{}{}^{84}{}_{}{}^{}\mathrm{Kr}$ have been measured following the decay of 32 min ${}_{}{}^{84}{}_{}{}^{}\mathrm{Br}$ using a Ge(Li)-NaI(Tl) spectrometer. Measurements have been carried out for ten gamma cascades, resulting in the following multipole mixing ratios: $\delta \mathrm{}\left(605\right)=+0.01\mathrm{}\pm 0.01$, $\delta \mathrm{}\left(736\right)=-0.07\mathrm{}\pm 0.01$, $\delta \mathrm{}\left(802\right)=-0.04\mathrm{}\pm 0.01$, $\delta \mathrm{}\left(987\right)=-0.08\mathrm{}\pm 0.01$, $\delta \mathrm{}\left(1016\right)=+0.80\mathrm{}\pm 0.03$, $\delta \mathrm{}\left(1741\right)=-1.05\mathrm{}\pm 0.07$, $\delta \mathrm{}\left(1877\right)=-0.07\mathrm{}\pm 0.03$, and $\delta \mathrm{}\left(2484\right)=+0.01\mathrm{}\pm 0.01$. These data permitted assignments of spins to the levels at 2345 ($4^{+}$), 2623 ($2^{+}$), 2759 ($2^{\pm }$), 3082 ($3^{\pm }$), 3366 keV ($1^{\pm }$) and confirmed previous assignments for the 1898 ($2^{+}$), 2095 ($4^{+}$), and 2700 keV ($3^{-}$) levels. A comparison of some properties of the $2_2^{+}$ and $2_1^{+}$ states in ${}_{}{}^{84,82,80}{}_{}{}^{}\mathrm{Kr}$ and in other even-even nuclei (Ru, Pd, and Cd) is also presented.

RADIOACTIVITY ${}_{}{}^{84}{}_{}{}^{}\mathrm{Br}$ from fission of U; measured $\gamma \gamma \left(\theta \right)$. ${}_{}{}^{84}{}_{}{}^{}\mathrm{Kr}$ levels deduced $J$, $\pi$, $\delta$.

• Received 1 June 1979

DOI:https://doi.org/10.1103/PhysRevC.21.1531