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Title: | Investigation of the Δn = 0 selection rule in Gamow-Teller transitions: The β-decay of 207 Hg |
Authors: | Berry, T.A.; Podolyák, Z.; Carroll, R.J.; Lica, R.; Grawe, H.; Timofeyuk, N.K.; Alexander, T.; Andreyev, A.N.; Ansari, S.; García Borge, María José ![]() ![]() ![]() ![]() ![]() ![]() |
Issue Date: | 24-Apr-2019 |
Publisher: | Elsevier BV |
Citation: | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 793: 271-275 (2019) |
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 →π0g transition has been investigated from the β decay of the ground state of Hg into the single-proton-hole nucleus Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible γ-ray transitions depopulating the π0g state in Tl, an upper limit of 3.9×10 % 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. |
Description: | 5 pags., 3 figs., 1 tab. -- Open Access funded by Creative Commons Atribution Licence 4.0 |
Publisher version (URL): | http://dx.doi.org/10.1016/j.physletb.2019.04.039 |
URI: | http://hdl.handle.net/10261/208677 |
DOI: | 10.1016/j.physletb.2019.04.039 |
Identifiers: | doi: 10.1016/j.physletb.2019.04.039 issn: 0370-2693 |
Appears in Collections: | (CFMAC-IEM) Artículos |
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