Abstract
A high-precision half-life measurement for the superallowed emitter was performed at the TRIUMF-ISAC radioactive ion beam facility yielding , consistent with, but 2.5 times more precise than, the previous world average. The half-life and value, 3037.53(61) s, are now the most precisely determined for any superallowed decay. Combined with recent theoretical corrections for isospin-symmetry-breaking and radiative effects, the corrected value for , 3073.0(12) s, sets a new benchmark for the high-precision superallowed Fermi -decay studies used to test the conserved vector current hypothesis and determine the element of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.
- Received 20 August 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.032501
© 2011 American Physical Society