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arXiv · 2603.11429

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

Eunja Ha·Myung-Ki Cheoun·H. Sagawa·Gianluca Colò
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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.

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Eunja Ha, Myung-Ki Cheoun, H. Sagawa, Gianluca Colò. 2026-03-12. Gamow-Teller strength of $^{12,14,16}$C within deformed quasiparticle random-phase approximation. https://arxiv.org/abs/2603.11429

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