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 agnetic diabatic ollimation and an 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
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