Fermi beta decay: The masses of Mg22, Si26, S30, and Ar34
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The Q values for (p,t) reactions leading to Mg22, Si26, S30, and Ar34 have been measured, yielding mass excesses for these nuclei of -399 ± 3 keV, -713 ± 3 keV, -14 062 ± 3 keV, and -18 379 ± 3 keV, respectively. The results for Mg22 and Ar34 are significantly different from average values quoted in the 1971 Mass Tables. For all four nuclei, these results allow the ft values for their Fermi β-decay branches to be calculated with improved precision, and in the cases of A=26 and A=34 more exacting comparisons of mirror Fermi decays become possible. The measured asymmetries now are Δ(26)=-1.2±1.6% and Δ(34)=0.2±0.6%, thus removing any obvious disagreement with calculations of charge-dependent mixing. [NUCLEAR REACTIONS Mg24, Si28, S32, Ar36(p,t), E=40.2 MeV; measured Q values. Mg22, Si26, S30, Ar34 deduced masses, ft values, mirror asymmetries for A=26,34.] © 1974 The American Physical Society.
author list (cited authors)
Hardy, J. C., Schmeing, H., Benenson, W., Crawley, G. M., Kashy, E., & Nann, H.