The predictions of asymmetric collective models with pure quadrupole, pure octupole, and mixed quadrupole-plus-octupole shapes are developed for negative-parity states in deformed even nuclei in an effort to determine the usefulness of the asymmetric model as a tool to distinguish surface shapes. The models are applied to the data for ${}_{}{}^{228}{}_{}{}^{}\mathrm{Th}$, ${}_{}{}^{232}{}_{}{}^{}\mathrm{U}$, and ${}_{}{}^{234}{}_{}{}^{}\mathrm{U}$, and the comparison indicates that the energy and electric quadrupole branching-ratio predictions are independent of surface-shape multipolarity.

• Received 6 March 1970

DOI:https://doi.org/10.1103/PhysRevC.2.1814