Abstract
The half-life of the superallowed Fermi β+ emitter Ne18 has been determined via two high-precision β counting experiments at TRIUMF's Isotope Separator and Accelerator facility. Using two different 4π continuous-flow gas-proportional counters, two independent measurements were made, yielding a weighted average of T1/2=1.66400−0.00048+0.00057 s, which is consistent with but approximately 2 times more precise than a previous high-precision measurement based on γ-ray counting. The present work achieves ±0.034% precision for the Ne18 half-life and will enable the inclusion of Ne18 among the set of precisely measured superallowed Fermi β-decay ft values once improved measurements are made for its Q value and superallowed branching ratio. As a test of systematic uncertainties, the half-life of Ne23 was measured and the world average has been improved, by a factor of 1.7, to 37.148±0.032 s.7 MoreReceived 1 June 2015DOI:https://doi.org/10.1103/PhysRevC.92.025502©2015 American Physical Society
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