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Investigation of the Δn = 0 selection rule in Gamow-Teller transitions: The β-decay of 207 Hg

AuthorsBerry, 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 ; Creswell, J.; Fahlander, C.; Fraile, Luis M. ; Fynbo, H.O.U.; Gelletly, W.; Gerst, R.B.; Górska, M.; Gredley, A.; Greenlees, P.; Harkness-Brennan, L.J.; Huyse, M.; Judge, S.M.; Judson, D.S.; Konki, J.; Kurcewicz, J.; Kuti, I.; Lalkovski, S.; Lazarus, I.; Lund, M.; Madurga, M.; Marginean, N.; Marginean, R.; Marroquín, I. ; Mihai, C.; Mihai, R.E.; Nácher, Enrique ; Nae, S.; Negret, A.; Nija, C.; Page, R.D.; Pascu, S.; Patel, Z.; Perea, Ángel ; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Regan, P.H.; Rotaru, F.; Shand, C.M.; Tengblad, Olof ; Vedia, V.
Issue Date24-Apr-2019
PublisherElsevier BV
CitationPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 793: 271-275 (2019)
AbstractGamow-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 log⁡ft>8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date.
Description5 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
Identifiersdoi: 10.1016/j.physletb.2019.04.039
issn: 0370-2693
Appears in Collections:(CFMAC-IEM) Artículos
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