On the -value of the tritium -decay

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

doi:10.1209/epl/i2005-10559-2

All issues

Volume 74 / No 3 (May 2006)

Europhys. Lett., 74 3 (2006) 404-410

Abstract

Issue		Europhys. Lett. Volume 74, Number 3, May 2006


Page(s)		404 - 410
Section		General
DOI		https://doi.org/10.1209/epl/i2005-10559-2
Published online		07 April 2006

Europhys. Lett., 74 (3), pp. 404-410 (2006)

On the $\mth{Q}$ -value of the tritium $\mth{\beta}$ -decay

Sz. Nagy¹, T. Fritioff¹, M. Björkhage², I. Bergström² and R. Schuch¹

¹ Atomic Physics, AlbaNova, Stockholm University - S-106 91 Stockholm, Sweden
² Manne Siegbahn Laboratory (MSL) - Frescativägen 24, S-104 05 Stockholm, Sweden

Corresponding author: Tomas.Fritioff@physto.se

Received: 17 November 2005
Accepted: 7 March 2006

Abstract

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 3.016 049 278 7(25) $\un{u}$ and 3.016 029 321 7(26) $\un{u}$ , respectively. From these masses a new Q-value of the tritium β-decay was derived resulting in 18.589 8(12) $\un{keV}$ , 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.

PACS: 07.75.+h – Mass spectrometers / 27.10.+h – Properties of specific nuclei listed by mass ranges: $A \le 5$ / 32.10.Bi – Atomic masses, mass spectra, abundances, and isotopes

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