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

Berry, Tom A. ; Fahlander, Claes LU and De Witte, Hilde (2019) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 793. p.271-275
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... (More)
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. © 2019 The Authors (Less)
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Contribution to journal
publication status
published
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in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
793
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:85065199673
ISSN
0370-2693
DOI
10.1016/j.physletb.2019.04.039
language
English
LU publication?
yes
additional info
Export Date: 20 May 2019
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cd90039d-a0a1-4c42-a258-62d65278b3f1
date added to LUP
2019-05-20 12:30:15
date last changed
2022-04-26 00:05:22
@article{cd90039d-a0a1-4c42-a258-62d65278b3f1,
  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 log⁡ft>8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date. © 2019 The Authors}},
  author       = {{Berry, Tom A. and Fahlander, Claes and De Witte, Hilde}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  pages        = {{271--275}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Investigation of the Δn = 0 selection rule in Gamow-Teller transitions: The β-decay of 207 Hg}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2019.04.039}},
  doi          = {{10.1016/j.physletb.2019.04.039}},
  volume       = {{793}},
  year         = {{2019}},
}