Berry, T. A., Podolyák, Zs, Carroll, R. J. et al. (59 more authors) (2019) Investigation of the Δn = 0 selection rule in Gamow-Teller transitions : The β-decay of 207 Hg. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. pp. 271-275. ISSN 0370-2693
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 logft>8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date.
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Copyright, Publisher and Additional Information: | © 2019 The Authors. | ||||||
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Institution: | The University of York | ||||||
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) The University of York > York Institute for Materials Research The University of York > Faculty of Sciences (York) > Mathematics (York) |
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Depositing User: | Pure (York) | ||||||
Date Deposited: | 20 May 2019 10:30 | ||||||
Last Modified: | 06 Dec 2023 13:07 | ||||||
Published Version: | https://doi.org/10.1016/j.physletb.2019.04.039 | ||||||
Status: | Published online | ||||||
Refereed: | Yes | ||||||
Identification Number: | https://doi.org/10.1016/j.physletb.2019.04.039 | ||||||
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