Alternating-parity collective states of yrast and nonyrast bands in lanthanide and actinide nuclei

摘要

Excited collective states of even-even nuclei featuring quadrupole and octupole deformations are studied within a nonadiabatic collective model with a Gaussian potential energy. Rotational states of the yrast band and vibrational-rotational states of nonyrast bands are considered in detail. The energies of alternating-parity excited states of the yrast band in the Er-164, Ra-220, and Th-224 nuclei; the yrast and first nonyrast bands in the Sm-154 and Gd-160 nuclei; and the yrast, first nonyrast, and second nonyrast bands in the Ra-224 and Pu-240 nuclei are described well on the basis of the proposed model.