We measure the lifetimes of excited states in ${}_{}{}^{81}{}_{}{}^{}\mathrm{Rb}$ and in the core nucleus ${}_{}{}^{80}{}_{}{}^{}\mathrm{Kr}$. Ratios of reduced transition probabilities in ${}_{}{}^{80}{}_{}{}^{}\mathrm{Kr}$ are consistent with those given by the rotational model. The $B\left(E2\mathrm{}\right)\mathrm{}$ of the ${\frac{13}{2}}^{+}$ state in ${}_{}{}^{81}{}_{}{}^{}\mathrm{Rb}$ is in agreement with the particle-plus-rotor value and inconsistent with the weak-coupling prediction. The $B\left(E2\mathrm{}\right)\mathrm{}$ values of the ${\frac{17}{2}}^{+}$ and ${\frac{21}{2}}^{+}$ states lie much higher than predicted by several models.

• Received 28 January 1975

DOI:https://doi.org/10.1103/PhysRevLett.34.745