The superallowed -decay of 18Ne, 22Mg and 26Si
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The decays of 18 Ne, 22 Mg and 26 Si have been studied in experiments that employed a gas-transport system to reduce background activities. Through observation of the spectra of -delayed -rays, the half-lives of the three nuclei were measured to be 1687 9, 3857 9 and 2210 21M ms, respectively, and the branching ratios of the respective superallowed transitions were determined to be (7.66 0.21), (54.0 1.1) and (74.9 0.9) %. The resulting ft values give no indication of significant charge-dependent mixing, and comparison with the decay of 26m Al yields a mirror asymmetry for mass 26 of = (-0.8 1.5)%. These results are consistent with expectations. In addition, the ft values for a number of Gamow-Teller transitions have been established. 1975.