Beyond Mean Field Model for Gamow-Teller Giant Resonances and Β Decay
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS（2024）
Sichuan Univ
Abstract
. - The Gamow-Teller (GT) transitions in four magic nuclei 48Ca, 90Zr, 132Sn, and 208Pb are studied by self-consistent Hartree-Fock (HF) plus charge-exchange subtracted second random phase approximation (SSRPA) model with sev-eral Skyrme energy density functions (EDFs). These calculations show that SSRPA improves systematically the description of main GT strength distributions in terms of the excitation energy and the peak height. The quenching factors are evaluated to be 13-20% of the Ikeda sum rule for 48Ca, 90Zr, and 132Sn, due to the couplings to two particle-two hole (2p-2h) configurations. The effect of tensor interaction on the beta decay half-life in SSRPA model is also pointed out to change largely the half-lives by about one to two orders of magnitude with respect to the ones obtained without tensor force.
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