Abstract
The stability and/or instability of and parents are studied with respect to the and heavy-cluster decays. The -decay studies also include the heavier nuclei, for reasons of spherical magic shells at and The calculations are made by using the preformed cluster-decay model, and the obtained -decay half-lives are compared with the available experimental data. Having met with a very good success for the comparisons of -decay half-lives and in giving the associated known magic or submagic closed-shell structures of both the parent nuclei and daughter products, the interplay of closed-shell effects in the cluster-decay calculations is investigated. The cluster-decay calculations also give the closed shell effects of known spherical magicities, both for the parent and daughter nuclei, and further predict new (deformed) closed-shells at and due to both the stability and instability of Hg and Pb parents against cluster decays. Specifically, a new deformed daughter radioactivity is predicted for various cluster decays of and parents with the best possible measurable cases identified as the and decays of and/or parents. The predicted decay half-lives are within the measurable limits of the present experimental methods. The interesting point to note is that the parents with measurable cluster-decay rates are normal deformed nuclei at the transition between normal and superdeformation.
- Received 4 June 2003
DOI:https://doi.org/10.1103/PhysRevC.68.034321
©2003 American Physical Society