Effects of deformation on the beta-decay patterns of light even-even and odd-mass Hg and Pt isotopes

TL;DR

This study investigates how nuclear deformation influences beta-decay properties of neutron-deficient Hg and Pt isotopes using microscopic deformed quasiparticle models, revealing deformation-sensitive signatures in Gamow-Teller strength distributions.

Contribution

It introduces a microscopic method combining deformed quasiparticle RPA with Skyrme Hartree-Fock to analyze deformation effects on decay properties, including unmeasured GT distributions.

Findings

GT strength distributions are sensitive to nuclear deformation.

The method accurately reproduces experimental beta-decay half-lives.

Deformation signatures can serve as additional nuclear shape indicators.

Abstract

Bulk and decay properties, including deformation energy curves, charge mean square radii, Gamow-Teller (GT) strength distributions, and beta-decay half-lives, are studied in neutron-deficient even-even and odd-A Hg and Pt isotopes. The nuclear structure is described microscopically from deformed quasiparticle random-phase approximation calculations with residual interactions in both particle-hole and particle-particle channels, performed on top of a self-consistent deformed quasiparticle Skyrme Hartree-Fock basis. The observed sensitivity of the, not yet measured, GT strength distributions to deformation is proposed as an additional complementary signature of the nuclear shape. The $\beta$-decay half-lives resulting from these distributions are compared to experiment to demonstrate the ability of the method.