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

Journal Article · Thu Oct 15 04:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4932285· OSTI ID:22492480

Niu, Yifei ^[1]; Niu, Zhongming ^[2]; Colò, Gianluca ^[3]; Vigezzi, Enrico ^[4]

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1. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900 (China)
2. School of Physics and Material Science, Anhui University, Hefei 230601 (China)
3. Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy)
4. INFN, Sezione di Milano, via Celoria 16, I-20133 Milano (Italy)

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.

• OSTI ID: 22492480
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1681; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION 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