Gamow-Teller strength of $^{12,14,16}$C within deformed quasiparticle random-phase approximation

TL;DR

This study uses a deformed quasiparticle random-phase approximation to analyze Gamow-Teller transition strengths in light carbon isotopes, revealing the significant role of nuclear deformation and residual interactions in shaping GT strength distributions.

Contribution

It introduces a deformed QRPA approach with Skyrme Hartree-Fock and Brückner G-matrix interactions to systematically study GT strengths in carbon isotopes, highlighting deformation effects.

Findings

Nuclear deformation significantly influences GT strength in $^{12}$C.

The spherical limit reproduces key features of $^{14}$C GT data.

Deformation induces high-lying GT strength in $^{16}$C.

Abstract

We investigate the Gamow-Teller (GT) transition strength distributions in the light carbon isotopes $^{12,14,16}$C within the framework of the deformed quasiparticle random-phase approximation (DQRPA). Nuclear deformation is explicitly incorporated through Skyrme Hartree-Fock mean-field calculations combined with the QRPA formalism. The residual particle-hole $(p-h)$ and particle-particle $(p-p)$ interactions are derived from Br\"uckner $G$-matrix calculations based on the CD-Bonn potential, and their impact on the low-lying GT strengths is systematically examined by varying the corresponding interaction strengths. We find that nuclear deformation, associated with a reduced spin-orbit strength, plays a significant role in interpreting the GT strength distribution of $^{12}$C. In contrast, the calculated GT$^{(-)}$ strength distribution of $^{14}$C in the spherical limit reproduces the essential features of the experimental $(p,n)$ charge-exchange data. The case of $^{16}$C reveals additional high-lying GT strength associated with deformation-induced configuration mixing.