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

초록

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.

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