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Title: β-decay of magic nuclei: Beyond mean-field description

Nuclear β-decay plays an important role not only in nuclear physics but also in astrophysics. The widely used self-consistent Random Phase Approximation (RPA) models tend to overestimate the half-lives of magic nuclei. To overcome this problem, we go beyond the mean-field description and include the effects of particle-vibration coupling (PVC) on top of the RPA model. The β-decay half-lives of {sup 34}Si, {sup 68}Ni, {sup 78}Ni, and {sup 132}Sn are studied within this approach in the case of the Skyrme interaction SkM*. It is found that the low-lying Gamow-Teller (GT) strength is shifted downwards with the inclusion of the PVC effect, and as a consequence, the half-lives are reduced due to the increase of the phase space available for β-decay, which leads to a good agreement between theoretical and experimental lifetimes.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5]
  1. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900 (China)
  2. (Italy)
  3. School of Physics and Material Science, Anhui University, Hefei 230601 (China)
  4. Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy)
  5. INFN, Sezione di Milano, via Celoria 16, I-20133 Milano (Italy)
Publication Date:
OSTI Identifier:
22492480
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1681; Journal Issue: 1; Conference: Nuclear Structure and Dynamics '15: 3. international nuclear physics conference on nuclear structure and dynamics, Portoroz (Slovenia), 14-19 Jun 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BETA DECAY; GAMOW-TELLER RULES; HALF-LIFE; INTERACTIONS; MAGIC NUCLEI; MEAN-FIELD THEORY; NICKEL 68; NICKEL 78; NUCLEAR MODELS; PHASE SPACE; RANDOM PHASE APPROXIMATION; SILICON 34; SKYRME POTENTIAL; TIN 132