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 Δ<i>n</i>=0 selection rule in Gamow-Teller transitions: The β-decay of <SUP>207</SUP>Hg.
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 logft>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: | 12 Oct 2023 02:44 |
| DOI: | 10.1016/j.physletb.2019.04.039 |
| Open Access URL: | https://doi.org/10.1016/j.physletb.2019.04.039 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3041594 |
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