On the Q-value of the tritium β-decay

Sz Nagy, T. Fritioff, M. Björkhage, I. Bergström, R. Schuch

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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.

Original languageEnglish
Pages (from-to)404-410
Number of pages7
JournalEurophysics Letters
Issue number3
Publication statusPublished - May 1 2006


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nagy, S., Fritioff, T., Björkhage, M., Bergström, I., & Schuch, R. (2006). On the Q-value of the tritium β-decay. Europhysics Letters, 74(3), 404-410. https://doi.org/10.1209/epl/i2005-10559-2