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

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.

Comments: 8 pages, 5 figures; Accepted for publication in The European Physical Journal A : Hadrons and Nuclei