https://doi.org/10.1140/epjc/s2005-02139-7
experimental physics
Final results from phase II of the Mainz neutrino mass searchin tritium 
decay
1
Institut für Physik der Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
2
Helmholtz-Institut für Strahlen und Kernphysik, Universität Bonn, 53115, Bonn, Germany
* e-mail: Ernst.Otten@uni-mainz.de
This paper reports on the improved Mainz experiment on tritium 
spectroscopy which yields a 10 times higher signal to background ratio than before. The main experimental effects and systematic uncertainties have been investigated in side experiments, and possible error sources have been eliminated. Extensive data taking took place in the years 1997 to 2001. A residual analysis of the data sets yields for the square of the electron antineutrino mass the final result of 
eV2/c4. We derive an upper limit of 
eV/c2 at 95% confidence level for the mass itself.
© Springer-Verlag, 2005
