Superallowed β-Decay of Tz = 0 Nuclei with A >= 62
Abstract
Precise measurements of the intensities for superallowed Fermi 0^+ arrow 0^+ β decays have provided a demanding test of the CVC hypothesis at the level of 3x10-4 and also led to a result in disagreement with unitarity (at the 98% confidence level) for the CKM matrix^1. Since this would have profound implications for the minimal Standard Model it is essential to address possible "trival" 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 (> 1%) and readily tested. Precise lifetime measurements for ^38mK and ^37K, the first beams from ISAC, have already been completed and the initail study of ^74Rb is scheduled for July 1999. ^1 I.S. Towner and J.C. Hardy, Proc. of WEIN 1998, to be published
- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 1999
- Bibcode:
- 1999APS..DNP..IB11B