Investigation of the Delta n=0 selection rule in Gamow-Teller transitions: The beta-decay of Hg-207



Berry, TA, Podolyak, Zs, Carroll, RJ, Lica, R, Grawe, H, Timofeyuk, NK, Alexander, T, Andreyev, AN, Ansari, S, Borge, MJG
et al (show 52 more authors) (2019) Investigation of the Delta n=0 selection rule in Gamow-Teller transitions: The beta-decay of Hg-207. PHYSICS LETTERS B, 793. pp. 271-275.

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Abstract

Gamow-Teller β decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This Δn=0 requirement plays a major role in the β decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical r-process pathway below both Z=50 (for N>82) and Z=82 (for N>126). The level of forbiddenness of the Δn=1ν1g 9/2 →π0g 7/2 transition has been investigated from the β − decay of the ground state of 207 Hg into the single-proton-hole nucleus 207 Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible γ-ray transitions depopulating the π0g 7/2−1 state in 207 Tl, an upper limit of 3.9×10 −3 % was obtained for the probability of this decay, corresponding to log⁡ft>8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 06 Jun 2019 14:01
Last Modified: 19 Jan 2023 00:45
DOI: 10.1016/j.physletb.2019.04.039
Open Access URL: https://doi.org/10.1016/j.physletb.2019.04.039
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3041594