Lifetimes of states in ${}_{}{}^{75}{}_{}{}^{}\mathrm{Kr}$, excited in the ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$${(}^{24}$Mg,2pn${)}^{75}$Kr reaction at 75 MeV, have been measured using the recoil-distance technique. The E2 transition strengths in ${}_{}{}^{75}{}_{}{}^{}\mathrm{Kr}$ have been interpreted within the rigid-triaxial-rotor–plus–quasiparticle model. A consistent set of parameters, required for the application of this model, has been obtained from a systematic study of Kr isotopes. The prediction of the model describes the experimental data rather well and suggests a deformation of β≊0.4 for ${}_{}{}^{75}{}_{}{}^{}\mathrm{Kr}$.

• Received 22 November 1989

DOI:https://doi.org/10.1103/PhysRevC.42.591