Shape polarizations of two-quasiparticle [Formula Presented] isomeric configurations

Abstract

Two-quasiparticle [Formula Presented] isomeric states in the [Formula Presented] and 180 regions are studied with configuration-constrained calculations of potential-energy surfaces. Strong shape-polarization effects due to the two quasiparticles are found. In particular, the nuclei [Formula Presented] and [Formula Presented] can be polarized from ground-state spherical or oblate shapes to prolate shapes, indicating a combination of K isomerism and shape isomerism as the Fermi level approaches shell closure. © 1999 The American Physical Society.