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An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN

Authors
  • Aker, M.
  • Altenmüller, K.
  • Arenz, M.
  • Babutzka, M.
  • Barrett, J.
  • Bauer, S.
  • Beck, M.
  • Beglarian, A.
  • Behrens, J.
  • Bergmann, T.
  • Besserer, U.
  • Blaum, K.
  • Block, F.
  • Bobien, S.
  • Bokeloh, K.
  • Bonn, J.
  • Bornschein, B.
  • Bornschein, L.
  • Bouquet, H.
  • Brunst, T.
  • And 188 more
Publication Date
Jan 01, 2019
Source
HAL-SHS
Keywords
Language
English
License
Unknown
External links

Abstract

We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic end point at 18.57 keV gives an effective neutrino mass square value of (-1.0-1.1+0.9) eV2. From this, we derive an upper limit of 1.1 eV (90% confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of 2 and provides model-independent input to cosmological studies of structure formation.

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