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Isospin-symmetry-hindered branch of ^(42)Sc β-decay

Ingalls, P. D. and Overley, J. C. and Wilson, H. S. (1977) Isospin-symmetry-hindered branch of ^(42)Sc β-decay. Nuclear Physics A, 293 (1-2). pp. 117-124. ISSN 0375-9474. doi:10.1016/0375-9474(77)90480-8.

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The branching fraction for the isospin-symmetry-hindered positron decay of ^(42)Sc to ^(42)Ca (1.837 MeV) was measured to be (6.3 ± 2.6) × 10^(−5) by observation of delayed γ-rays. This branch alone corresponds to a reduction of the superallowed ground-state Fermi strength by (0.043 ± 0.018)%. The ^(42)Sc sources were produced by the ^(42)Ca(p, n)^(42)Sc reaction at 7.7 MeV. The measured branching agrees with Coulomb-mixing calculations by Rappleyea and Kunz and by Towner, but is smaller than other calculations. This result is of interest in connection with the intercomparison of the super-allowed 0+ → 0+ pure Fermi decays, which determine the effective vector coupling constant of nuclear β-decay.

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Additional Information:© 1977 Elsevier B.V. Supported in part by the National Science Foundation [PHY76-83685].
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Subject Keywords:Radioactivity
Issue or Number:1-2
Record Number:CaltechAUTHORS:20170816-110615079
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Official Citation:P.D. Ingalls, J.C. Overley, H.S. Wilson, Isospin-symmetry-hindered branch of 42Sc β-decay, Nuclear Physics A, Volume 293, Issues 1–2, 12–19 December 1977, Pages 117-124, ISSN 0375-9474, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80484
Deposited By: Tony Diaz
Deposited On:16 Aug 2017 18:11
Last Modified:15 Nov 2021 19:36

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