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Background: Models to calculate small isospin-symmetry-breaking effects insuperallowed Fermi decays have been placed under scrutiny in recent years. Astringent test of these models is to measure transitions for which thecorrection is predicted to be large. The decay of 32Cl decay provides such atest case. Purpose: To improve the gamma yields following the beta decay of32Cl and to determine the ft values of the the beta branches, particularly theone to the isobaric-analogue state in 32S. Method: Reaction-produced andrecoil-spectrometer-separated 32Cl is collected in tape and transported to acounting location where beta-gamma coincidences are measured with aprecisely-calibrated HPGe detector. Results: The precision on the gamma yieldsfor most of the known beta branches has been improved by about an order ofmagnitude, and many new transitions have been observed. We have determined32Cl-decay transition strengths extending up to E_x~11 MeV. The ft value forthe decay to the isobaric-analogue state in 32S has been measured. A comparisonto a shell-model calculation shows good agreement. CONCLUSIONS: We haveexperimentally determined the isospin-symmetry-breaking correction to thesuperallowed transition of this decay to be (\delta_C-\delta_NS)_exp=5.4(9)%,significantly larger than for any other known superallowed Fermi transition.This correction agrees with a shell-model calculation, which yields\delta_C-\delta_NS=4.8(5)%. Our results also provide a way to improve themeasured ft values for the beta decay of 32Ar.

The beta Decay of 32Cl: Precision gamma-Ray Spectroscopy and a Measurement of Isospin-Symmetry Breaking