Neutron-rich, odd-Z nuclei ${}_{}{}^{145}{}_{}{}^{}\mathrm{La}$ and ${}_{}{}^{147}{}_{}{}^{}\mathrm{La}$ populated in spontaneous fission of ${}_{}{}^{248}{}_{}{}^{}\mathrm{Cm}$ were studied using the EUROGAM array. The experiment indicates the presence of similar octupole correlations in the studied La isotopes as found in the barium core nuclei. Alternating-parity structures were found in ${}_{}{}^{145}{}_{}{}^{}\mathrm{La}$, indicating enhanced octupole correlations, as observed in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Ba}$, while in ${}_{}{}^{147}{}_{}{}^{}\mathrm{La}$ octupole effects are weakened by alignment phenomena, as seen in the core nucleus ${}_{}{}^{146}{}_{}{}^{}\mathrm{Ba}$. © 1996 The American Physical Society.

• Received 5 February 1996

DOI:https://doi.org/10.1103/PhysRevC.54.945