Phys. Rev. Lett. 91, 082501 (2003) [4 pages]High Precision Measurement of the Superallowed 0+→0+β Decay of 22MgReceived 30 January 2003; published 20 August 2003 The half-life, 3.8755(12) s, and superallowed branching ratio, 0.5315(12), for 22Mg β decay have been measured with high precision. The latter depended on γ-ray intensities being measured with an HPGe detector calibrated for relative efficiencies to an unprecedented 0.15%. Previous precise measurements of 0+→0+ transitions have been restricted to the nine that populate stable daughter nuclei. No more such cases exist, and any improvement in a critical Cabibbo-Kobayashi-Maskawa unitarity test must depend on precise measurements of more exotic nuclei. With this branching-ratio measurement, we show those to be possible for Tz=-1 parents. We obtain a corrected Ft value of 3071(9) s, in good agreement with expectations. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.082501
DOI:
10.1103/PhysRevLett.91.082501
PACS:
23.40.Bw, 23.40.Hc, 27.30.+t, 29.40.Wk
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