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Updated: Apr 18, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Atomic masses of tritium and helium-3
E G Myers1, A Wagner1, H Kracke1
1Department of Physics, Florida State University, Tallahassee, Florida 32306-4350, USA.
Abstract:
By measuring the cyclotron frequency ratios of (3)He(+) to HD(+) and T(+) to HD(+), and using HD(+) as a mass reference, we obtain new atomic masses for (3)He and T. Our results are M[(3)He]=3.016 029 322 43(19) u and M[T]=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 β decay to be (M[T]-M[(3)He])c(2)=18 592.01(7) eV. This allows an improved test of systematics in measurements of tritium β decay that set limits on neutrino mass.
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