Eur Phys J C (2004) 33: s805-s807
https://doi.org/10.1140/epjcd/s2003-03-902-9

PS09 Neutrino Properties and Oscillations

Latest results of the Mainz Neutrino Mass Experimen

¹ Institut für Physik, Joh. Gutenberg University Mainz, 55099 Mainz, Germany
² Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, 53115 Bonn, Germany

Received: 1 November 2003
Accepted: 11 November 2003
Published online: 2 December 2003

Abstract

The Mainz Neutrino Mass Experiment investigates the endpoint region of the tritium β decay spectrum very precisely to extract the rest mass of the electron antineutrino. The measurements are performed with a MAC-E-Filter, combining [InlineMediaObject not available: see fulltext.]agnetic [InlineMediaObject not available: see fulltext.]diabatic [InlineMediaObject not available: see fulltext.]ollimation and an [InlineMediaObject not available: see fulltext.]lectrostatic high pass Filter. After optimal preparation of the apparatus very stable and high quality data have been taken in 2001, which do not show any residual problem. A combined analysis of data from 1998/1999 and 2001 lead to the final value of m _ν ² = –0.7 ± 2.2 _stat ± 2.1 _sys  eV²/c⁴, leading to an upper limit m _ν ≤ 2.3 eV/c² (95% C.L.).

PACS: 14.60.P Neutrinos, mass and mixing – 23.40 β decay