https://doi.org/10.1140/epja/s10050-025-01611-8
Regular Article - Theoretical Physics
Nuclear 
-decay half-lives within the subtracted second random-phase approximation
1
INFN-LNS, Laboratori Nazionali del Sud, 95123, Catania, Italy
2
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
a
danilo.gambacurta@lns.infn.it
Received:
29
January
2025
Accepted:
3
June
2025
Published online:
23
June
2025
We employ, within the framework of Skyrme energy-density functional theory, the subtracted second random-phase approximation, recently developed for charge-exchange excitations, to compute -decay half-lives in four nuclei, 
O, 
Si, 
Ni, and 
Sn. Following our recent results on the description of the Gamow–Teller strength, we proceed coherently in the present work by computing -decay half-lives using the bare value of the axial-vector coupling constant 
. Half-lives are thus obtained, within the allowed Gamow–Teller approximation, without the use of any ad hoc quenching factors. A genuine quenching is indeed microscopically introduced in our model owing to the correlations induced by the coupling of one-particle one-hole configurations with two-particle two-hole ones. The role of the so-called 
terms is also studied. By comparing our results with experimental data, we show a general improvement of -decay half-lives with respect to results obtained within the commonly used Random Phase Approximation (RPA). The inclusion of the two-particle two-hole configurations produces a more fragmented and richer spectrum within the -window, resulting in lower half-lives with respect to the RPA ones.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
