We report here the atomic masses of 3H and 3He determined by using the Penning trap mass spectrometer SMILETRAP. The measurements are based on cyclotron frequency determinations of 3H1+ and 3He1+ using H 2+ ions as mass reference. The mass values for 3H and 3He are 3.016049278 7(25) u and 3.016029321 7(26) u, respectively. From these masses a new Q-value of the tritium β-decay was derived resulting in 18.5898(12) keV, being the most accurate value at present. The Q-value of the tritium β-decay is related to the possible rest mass of the electron antineutrino.
ASJC Scopus subject areas
- Physics and Astronomy(all)