Abstract
Gamow–Teller excitations attract the constant interest of physicists not only within nuclear structure but also in astrophysics. In this paper, the random phase approximation (RPA) plus particle-vibration coupling model is applied to the investigation of Gamow–Teller excitations in the doubly magic nuclei 208Pb and 132Sn. It is found that the Gamow–Teller resonance develops a large spreading width and that the excitation energies are shifted downward by phonon coupling. Good agreement with experiment is obtained for the line shape of the Gamow–Teller distribution for 208Pb using the Skyrme interactions SkM* and SGII. It is also found that the collective isovector giant dipole phonons play an important role in the width of both nuclei, and the related microscopic mechanism is analyzed in detail.
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