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Experimental Validation of the Largest Calculated Isospin-Symmetry-Breaking Effect in a Superallowed Fermi Decay

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arxiv 1108.5312 v2 pith:TFGFKSJF submitted 2011-08-26 nucl-ex nucl-th

D. Melconian , S. Triambak , C. Bordeanu , A. García , J. C. Hardy , V. E. Iacob , N. Nica , H. I. Park
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G. Tabacaru L. Trache I. S. Towner R. E. Tribble Y. Zhai
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classification nucl-exnucl-th
keywords decayfermiisospin-symmetry-breakingsuperallowedagreementalmostamountanalogue
verification ladder T0 review T1 audit T2 compute T3 formal
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A precision measurement of the gamma yields following the beta decay of 32Cl has determined its isobaric analogue branch to be (22.47^{+0.21}_{-0.19})%. Since it is an almost pure Fermi decay, we can also determine the amount of isospin-symmetry breaking in this superallowed transition. We find a very large value, delta_C=5.3(9)%, in agreement with a shell-model calculation. This result sets a benchmark for isospin-symmetry-breaking calculations and lends support for similarly-calculated, yet smaller, corrections that are currently applied to 0+ -> 0+ transitions for tests of the Standard Model.

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