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Precision branching ratio measurement for the superallowed beta+ emitter 62Ga and isospin-symmetry-breaking corrections in A>or=62 nuclei |
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| Authors: | Hyland B Svensson C E Ball G C Leslie J R Achtzehn T Albers D Andreoiu C Bricault P Churchman R Cross D Dombsky M Finlay P Garrett P E Geppert C Grinyer G F Hackman G Hanemaayer V Lassen J Lavoie J P Melconian D Morton A C Pearson C J Pearson M R Phillips A A Schumaker M A Smith M B Towner I S Valiente-Dobón J J Wendt K Zganjar E F |
| Institution: | Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada. |
| Abstract: | 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. |
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