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

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 Brückner $G$-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.

Comments: 26 pages,13 figures, 5 Tables