Latest results of the Mainz Neutrino Mass Experimen

C. Kraus; J. Bonn; B. Bornschein; L. Bornschein; B. Flatt; A. Kovalik; B. Müller; E.W. Otten; T. Thümmler; J.P. Schall; C. Weinheimer

doi:10.1140/epjcd/s2003-03-902-9

2022 Impact factor 4.4

Particles and Fields

Open Access

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

C. Kraus¹, J. Bonn¹, B. Bornschein¹, L. Bornschein¹, B. Flatt¹, A. Kovalik¹, B. Müller¹, E.W. Otten¹, T. Thümmler¹, J.P. Schall¹ and C. Weinheimer²

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.).