New shell-model investigation of the lead-208 mass region: Spectroscopic properties and collectivity

Abstract

Within the large-scale shell-model framework, an investigation of even-even nuclei in the vicinity of the $^{208}\mathrm{Pb}$ closed core is reported in the present work. The calculations of the low-lying state energies and the electromagnetic transitions of the Pb, Po, Rn, Ra, and Th nuclei with $126\ensuremath{\le}N\ensuremath{\le}134$ are performed using a new effective interaction H208 derived from CD-Bonn nucleon-nucleon potential, through the ${V}_{\mathrm{low}\text{\ensuremath{-}}k}$ procedure. A special focus is devoted to the degree of the collectivity, where a transitional region from spherical nuclear shape to weakly collective behavior is revealed.

Topics & Concepts