Concealed configuration mixing and shape coexistence in the platinum nuclei

Abstract

The role of configuration mixing in the Pt region is investigated. The nature of the ground state changes smoothly, being spherical around mass A 174 and A 192 and deformed around the mid-shell N = 104 region. Interacting Boson Model with configuration mixing calculations are presented for deformations and isotope shifts. The assumption of the existence of two configurations with very different deformation provides a simple framework to explain the observed isotope shifts systematics.