Abstract
A realistic density-dependent nucleon-nucleon () interaction with a finite-range exchange part which produces the nuclear matter saturation curve and the energy dependence of the nucleon-nucleus optical model potential is used to calculate the microscopic -nucleus potential in the well-established double-folding model. The main effect of antisymmetrization under exchange of nucleons between the and daughter nuclei has been included in the folding model through the finite-range exchange part of the interaction. The -decay half-lives have been determined using a microscopic potential within the semiclassical Wentzel-Kramers-Brillouin approximation in combination with the Bohr-Sommerfeld quantization condition. We systematically studied the preformation probability, , for ten even-even and odd mass heavy nuclei from Po to No isotopes. We found that has a regular behavior with if the particle emitted from adjacent isotopes comes from the same energy levels or from a group of levels, assuming that the order of levels in this group is not changed. Sudden increase in is found when protons and neutrons holes exist below the Fermi levels. Based on the similarity in the behavior of with the neutron number for two adjacent nuclei, we try to determine the unknown or doubted nuclear spins and parities or at least correlate spins of adjacent nuclei.
3 More- Received 23 September 2013
DOI:https://doi.org/10.1103/PhysRevC.88.054604
©2013 American Physical Society