Abstract
We measured the half-life of the superallowed emitter to be ms. We used pure sources of and employed a high-efficiency gas counter, which was sensitive to positrons from both this nuclide and its daughter . The data were analyzed as a linked parent-daughter decay. To contribute meaningfully to any test of the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the value of a superallowed transition must be determined to a precision of or better. With a precision of , the present result is more than sufficient to be compatible with that requirement. Only the branching ratio now remains to be measured precisely before a value can be obtained for the superallowed transition from .
- Received 22 February 2010
DOI:https://doi.org/10.1103/PhysRevC.82.035502
©2010 American Physical Society