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Phys. Rev. C 76, 018501 (2007) [3 pages]

Upper limits on the first-forbidden rank-one β decay of 20F

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E. L. Wilds, Jr.*
Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA

R. H. France III
Department of Chemistry and Physics, Campus Box 82, Georgia College and State University, Milledgeville, Georgia 31061, USA

J. E. McDonald
Department of Physics, 200 Bloomfield Ave., University of Hartford, West Hartford, Connecticut 06117-1599, USA

Z. Zhao and M. Gai†
A. W. Wright Nuclear Structure Laboratory, P.O. Box 208124, Yale University, 272 Whitney Avenue, New Haven, Connecticut 06520-8124, USA

Received 3 April 2007; published 19 July 2007

We used our (perviously described) system for high sensitivity measurements of β-delayed α-particle emission of light nuclei to measure upper limits of the branching ratios of the first-forbidden rank-one β decay of the 2+ ground state of 20F to the 3-,5.62 MeV, and 1-,5.79 MeV excited states of 20Ne to be 1.5×10-6 and 7×10-7, respectively. These limits are more than a factor of 300 smaller than previously measured. The obtained ft values are at least a factor of 10 smaller than that of the first-forbidden rank-zero β decay to the 2- state at 4.97 MeV in 20Ne, whose branching ratio was also measured to be 1.2(6)×10-4, in agreement with the precise value obtained by Alburger and Warburton of 0.90(4)×10-4.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.018501
DOI:
10.1103/PhysRevC.76.018501
PACS:
23.40.Hc, 27.30.+t

*Permanent address: Division of Radiation Safety, Connecticut-DEP, 79 Elm Street, Hartford, CT 06106.

†Permanent address: Laboratory for Nuclear Science at Avery Point, 1084 Shennecossett Rd., University of Connecticut, Groton, CT 06340-6097, USA.

 
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