DEFORMATION OF ODD NUCLEI 23Na, 25Mg, AND 25Al IN SINGLE-PARTICLE STATES

Abstract

Using the evolutionary approach recently developed by us, the shapes of odd 2s1d-shell 23Na, 25Mg and 25Al nuclei in the ground and single-particle excited states have been extracted from the experimental data on the energies, spins, and parities of these states, as well as the measured probabilities of electromagnetic transitions between them. We have found that the single-particle spectra of the nuclei studied contain the single states and the continuous sets of states with abnormally weak deformation. This indicates the existence of the shape phase transitions from the spherical state of the nucleus into a deformed state.