Abstract
The half-life of the superallowed Fermi emitter has been determined via two high-precision counting experiments at TRIUMF's Isotope Separator and Accelerator facility. Using two different continuous-flow gas-proportional counters, two independent measurements were made, yielding a weighted average of s, which is consistent with but approximately 2 times more precise than a previous high-precision measurement based on -ray counting. The present work achieves precision for the half-life and will enable the inclusion of among the set of precisely measured superallowed Fermi -decay values once improved measurements are made for its value and superallowed branching ratio. As a test of systematic uncertainties, the half-life of was measured and the world average has been improved, by a factor of 1.7, to s.
7 More- Received 1 June 2015
DOI:https://doi.org/10.1103/PhysRevC.92.025502
©2015 American Physical Society