High Precision Measurement of the Superallowed 0^+ to 0^+ Beta Decay of ^{22}Mg

Details High Precision Measurement of the Superallowed 0^+ to 0^+ Beta Decay of ^{22}Mg High Precision Measurement of the Superallowed 0^+ to 0^+ Beta Decay of ^{22}Mg

2003-07-31

arxiv.org/abs/nucl-ex/0308001v1

Phys.Rev.Lett. 91 (2003) 082501

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 2 figures, revtex4

Scientific paper

10.1103/PhysRevLett.91.082501

The half-life, 3.8755(12) s, and superallowed branching ratio, 0.5315(12), for ^{22}Mg beta-decay have been measured with high precision. The latter depended on gamma-ray intensities being measured with an HPGe detector calibrated for relative efficiencies to an unprecedented 0.15%. Previous precise measurements of 0^+ to 0^+ transitions have been restricted to the nine that populate stable daughter nuclei. No more such cases exist, and any improvement in a critical CKM unitarity test must depend on precise measurements of more exotic nuclei. With this branching-ratio measurement, we show those to be possible for T_z = -1 parents. We obtain a corrected Ft-value of 3071(9) s, in good agreement with expectations.

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