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By measuring the cyclotron frequency ratios of ^3He^+ to HD^+ and T^+ to HD^+, and using HD^+ as a mass reference, we obtain new atomic masses for ^3He and T. Our results are M^3He=3. 016 029 322 43 (19) u and MT=3. 016 049 281 78 (19) u, where the uncertainty includes an uncertainty of 0. 12 nu in the mass reference. Allowing for cancellation of common systematic errors, we find the Q value for tritium decay to be (MT-M^3He) c^2=18 592. 01 (7) eV. This allows an improved test of systematics in measurements of tritium decay that set limits on neutrino mass.
Myers et al. (Wed,) studied this question.