학술논문
Investigation of the Δn = 0 selection rule in Gamow-Teller transitions: The β-decay of 207Hg
Document Type
article
Author
T.A. Berry; Zs. Podolyák; R.J. Carroll; R. Lică; H. Grawe; N.K. Timofeyuk; T. Alexander; A.N. Andreyev; S. Ansari; M.J.G. Borge; J. Creswell; C. Fahlander; L.M. Fraile; H.O.U. Fynbo; W. Gelletly; R.-B. Gerst; M. Górska; A. Gredley; P. Greenlees; L.J. Harkness-Brennan; M. Huyse; S.M. Judge; D.S. Judson; J. Konki; J. Kurcewicz; I. Kuti; S. Lalkovski; I. Lazarus; M. Lund; M. Madurga; N. Mărginean; R. Mărginean; I. Marroquin; C. Mihai; R.E. Mihai; E. Nácher; S. Nae; A. Negret; C. Niţă; R.D. Page; S. Pascu; Z. Patel; A. Perea; V. Pucknell; P. Rahkila; E. Rapisarda; P.H. Regan; F. Rotaru; C.M. Shand; E.C. Simpson; Ch. Sotty; S. Stegemann; T. Stora; O. Tengblad; A. Turturica; P. Van Duppen; V. Vedia; R. Wadsworth; P.M. Walker; N. Warr; F. Wearing; H. De Witte
Source
Physics Letters B, Vol 793, Iss , Pp 271-275 (2019)
Subject
Language
English
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=1ν1g9/2→π0g7/2 transition has been investigated from the β− decay of the ground state of 207Hg into the single-proton-hole nucleus 207Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible γ-ray transitions depopulating the π0g7/2−1 state in 207Tl, 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.