Tests of the Standard Model from Nuclear Beta-Decay Studies at Isac

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Precise measurements of the intensities for superallowed Fermi 0+ → 0+ β-decays have provided a demanding test of the CVC hypothesis at the level of 3 × 10-4 and also led to a result in disagreement with unitarity (at the 98% confidence level) for the CKM matrix. Since this result would have profound implications for the minimal Standard Model it is essential to address possible "trivial" explanations for this apparent non-unitarity, such as uncertainties in the theoretical isospin symmetry-breaking correction. At ISAC we are pursuing a program to study the Tz = 0 (odd-odd) emitters with A ≥ 62 where this correction is predicted to be large and readily tested. Precise lifetime measurements for 38mK and 37K, the first beams from ISAC have already been completed and the initial study of 74Rb was carried out in August 1999 when a 10 μA beam of 500 MeV protons was used to produce ~ 5000 74Rb ions/s; a world record. The results of these first experiments at ISAC are presented.

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