Precision branching ratio measurement for the superallowed beta+ emitter 62Ga and isospin-symmetry-breaking corrections in A>or=62 nuclei.
A high-precision branching ratio measurement for the superallowed beta+ decay of 62Ga was performed at the Isotope Separator and Accelerator radioactive ion beam facility. Nineteen gamma rays emitted following beta+ decay of 62Ga were identified, establishing the dominant superallowed branching ratio to be (99.861+/-0.011)%. Combined with recent half-life and Q-value measurements, this branching ratio yields a superallowed ft value of 3075.6+/-1.4 s for 62Ga decay. These results demonstrate the feasibility of high-precision superallowed branching ratio measurements in the A>or=62 mass region and provide the first stringent tests of the large isospin-symmetry-breaking effects predicted for these decays.
Hyland
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Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
Svensson
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Ball
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Leslie
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Achtzehn
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Albers
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Andreoiu
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Bricault
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Churchman
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Cross
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Dombsky
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Finlay
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Garrett
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Geppert
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Grinyer
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Hackman
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Hanemaayer
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Lassen
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Lavoie
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Morton
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Pearson
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Pearson
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Phillips
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Schumaker
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Smith
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Towner
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Wendt
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