Gamow-Teller transitions from high-spin isomers in $N=Z$ nuclei

TL;DR

This paper investigates Gamow-Teller transitions from high-spin isomers in N=Z nuclei, revealing enhanced collectivity due to specific Fermi sphere interactions, using sum-rule and shell model approaches.

Contribution

It demonstrates that GT transitions from high-spin isomers exhibit stronger collectivity than from ground states, highlighting the role of spin-dependent Fermi spheres.

Findings

GT transition strengths are stronger from high-spin isomers.

Fermi spheres analogous to isospin spheres influence collectivity.

High-spin isomers show enhanced GT transition collectivity.

Abstract

Gamow-Teller (GT) transitions from high-spin isomers are studied using the sum-rule approach and the shell model. The GT transition strengths from the high-spin isomeric states show a stronger collectivity than those from the ground states in two $N=Z$ nuclei, $^{52}$Fe and $^{94}$Ag. It is argued that the spin-up and spin-down Fermi spheres involved in the GT transitions from the high-spin isomeric states play important roles. These Fermi spheres are analogous to the isospin-up and isospin-down Fermi spheres for the GT transitions from the ground states in $N>Z$ nuclei and create a strong collectivity.