Gamow-Teller strength distributions in O18 and in the well-deformed nuclei Mg24,26 by deformed quasiparticle random-phase approximation [Gamow-Teller strength distributions in ¹⁸O and in the well-deformed nuclei Mgi²⁴ʼ²⁶ by deformed quasiparticle random-phase approximation]

We investigate the Gamow-Teller (GT) transition strength distributions of strongly deformed nuclei, Mg24,26, as well as of O18. The calculations are performed within a deformed quasiparticle random-phase approximation which explicitly includes the deformation degree of freedom in the Skyrme-Hartree-Fock and random-phase approximation calculations. The residual particle-particle (p-p) interaction as well as the particle-hole (p-h) interaction are extracted from Brückner G-matrix calculations. The residual interaction dependence of the low-lying GT strength of these strongly deformed nuclei is examined by changing the strength of the residual p-p and p-h interactions. We have found that the low-lying GT peaks are quite similar in energy to those found in spherical N=Z and N=Z+2 nuclei near magic shells, but the configurations of Mg24,26 are largely mixed by the pairing correlations and the deformation. Our results are compared with the experimental GT (±) transition data by (t, He3) and (He3, t) reactions and are found to reproduce the main features of GT strength distributions.