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From the same journal

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

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  • T. A. Berry
  • Zs Podolyák
  • R. J. Carroll
  • R. Lică
  • H. Grawe
  • N. K. Timofeyuk
  • T. Alexander
  • 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
  • Ch Sotty
  • S. Stegemann
  • T. Stora
  • O. Tengblad
  • A. Turturica
  • P. Van Duppen
  • V. Vedia
  • P. M. Walker
  • N. Warr
  • F. Wearing
  • H. De Witte


Publication details

JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
DateAccepted/In press - 11 Apr 2019
DateE-pub ahead of print (current) - 24 Apr 2019
Number of pages5
Pages (from-to)271-275
Early online date24/04/19
Original languageEnglish


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 log⁡ft>8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date.

Bibliographical note

© 2019 The Authors.


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