Gamow-Teller strength distributions in <SUP>18</SUP>O and in the well-deformed nuclei <SUP>24,26</SUP>Mg by deformed quasiparticle random-phase approximation

Abstract

We investigate the Gamow-Teller (GT) transition strength distributions of strongly deformed nuclei, Mg-24,Mg-26, as well as of O-18. 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 Bruckner 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 Mg-24,Mg-26 are largely mixed by the pairing correlations and the deformation. Our results are compared with the experimental GT (+/-) transition data by (t, He-3) and (He-3, t) reactions and are found to reproduce the main features of GT strength distributions.

We investigate the Gamow-Teller (GT) transition strength distributions of strongly deformed nuclei, 24,26Mg, as well as of 18O. 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 24,26Mg are largely mixed by the pairing correlations and the deformation. Our results are compared with the experimental GT (±) transition data by (t, 3 He) and (3 He, t) reactions and are found to reproduce the main features of GT strength distributions.