Nuclear beta decay in magic nuclei is investigated, taking into account the coupling between particles and collective vibrations, on top of self-consistent random phase approximation calculations based on Skyrme density functionals. The low-lying Gamow-Teller strength is shifted downwards and at times becomes fragmented; as a consequence, the beta-decay half-lives are reduced due to the increase of the phase space available for the decay. In some cases, this leads to a very good agreement between theoretical and experimental lifetimes: this happens, in particular, in the case of the Skyrme force SkM* that can also reproduce the line shape of the high-energy Gamow-Teller resonance as was previously shown.

Particle-Vibration Coupling Effect on the β Decay of Magic Nuclei / Y. Niu, N. Z., G. Colo, V. E.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 114:14(2015 Apr 08).

Particle-Vibration Coupling Effect on the β Decay of Magic Nuclei

Y. Niu
Primo
;
G. Colo
Penultimo
;
2015

Abstract

Nuclear beta decay in magic nuclei is investigated, taking into account the coupling between particles and collective vibrations, on top of self-consistent random phase approximation calculations based on Skyrme density functionals. The low-lying Gamow-Teller strength is shifted downwards and at times becomes fragmented; as a consequence, the beta-decay half-lives are reduced due to the increase of the phase space available for the decay. In some cases, this leads to a very good agreement between theoretical and experimental lifetimes: this happens, in particular, in the case of the Skyrme force SkM* that can also reproduce the line shape of the high-energy Gamow-Teller resonance as was previously shown.
approximation algorithms; shell-model; r-process; skyrme interaction; spin-isospin; half-lives; parametrization; fragmentation; excitations; stars; Beta decay; density functionals; half lives; line shape; random phase approximations; skyrme-forces; vibration coupling effects; phase space methods
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/355001
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