Shell model description of Gamow-Teller strengths in $pf$-shell nuclei

TL;DR

This paper employs the shell model with GXPF1a and KB3G interactions to systematically describe Gamow-Teller strength distributions in certain $pf$-shell nuclei, aligning well with recent experimental data from $eta$ decay and charge-exchange reactions.

Contribution

It provides a comprehensive shell model analysis of Gamow-Teller strengths in $pf$-shell nuclei, comparing calculations with recent experimental measurements.

Findings

Qualitative agreement for individual transitions.

Calculated summed strengths closely match observed data.

Effective interactions successfully reproduce experimental distributions.

Abstract

A systematic shell model description of the experimental Gamow-Teller transition strength distributions in $^{42}$Ti, $^{46}$Cr, $^{50}$Fe and $^{54}$Ni is presented. These transitions have been recently measured via $\beta$ decay of these $T_z$=-1 nuclei, produced in fragmentation reactions at GSI and also with ($^3${He},$t$) charge-exchange (CE) reactions corresponding to $T_z = + 1$ to $T_z = 0$ carried out at RCNP-Osaka.The calculations are performed in the $pf$ model space, using the GXPF1a and KB3G effective interactions. Qualitative agreement is obtained for the individual transitions, while the calculated summed transition strengths closely reproduce the observed ones.