Abstract

Abstract The Mainz neutrino mass experiment is investigating the endpoint region of the tritium β decay spectrum to determine the mass of the electron antineutrino. With its recently improved setup data were taken over more than 7 month in 1998 and 1999. For these measurements two different analyses are presented leading to mv2 = +0.6±2.8±2.1 eV2/c4and mv2 = −1.6 ± 2.5 ± 2.1 eV2/c4, from which upper limits of mv

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