Abstract
Abstract The probabilities of forming an α -particle at the surface of heavy nuclei (spectroscopic factors) in the states of different angular momenta are calculated within the dinuclear system (DNS) approach. It is shown that this dependence is determined not only by the energies of the excited states of the daughter nucleus, as is suggested by the Boltzmann distribution, but also by its quadrupole and octupole deformation parameters. If the daughter nucleus is almost spherical, in the course of α -decay, it is predominantly populated in the ground state, whereas the population of other yrast states is strongly suppressed. If the daughter nucleus possesses quadrupole deformation but negligible octupole deformation, the states with even angular momenta are primarily populated. To populate the states with odd angular momenta, the daughter nucleus should be octupole deformed. The dependence of spectroscopic factors on the angular momentum of the daughter nucleus was calculated for actinide nuclei 222−228 Ra, 222−232 Th, 226−236 U, and 234−242 Pu. The results obtained will be useful in future studies on the fine structure of α -decay.