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Beglarian, A.; Behrens, J.; Berlev, A.; Besserer, U.; Block, F.; Bobien, S.; Böttcher, M.; Bornschein, L.; Brunst, T.; Caldwell, T. S.; Carney, R. M. D.; La Cascio, L.; Chilingaryan, S.; Choi, W.; Debowski, K.; Deffert, M.; Descher, M.; Díaz Barrero, D.; Doe, P. J.; Dragoun, O.; Drexlin, G.; Eitel, K.; Engel, R.; Enomoto, S.; Felden, A.; Franklin, G. B.; Friedel, F.; Fulst, A.; Gil, W.; Grössle, R.; Gupta, V.; Haußmann, N.; Helbing, K.; Hickford, S.; Hinz, D.; Jansen, A.; Karl, C.; Kellerer, F.; Kellerer, J.; Kleifges, M.; Klein, M.; Korzeczek, M.; Kovalík, A.; Krasch, B.; Kunka, N.; Lasserre, T.; Le, T. L.; Lebeda, O.; Lehnert, B.; Machatschek, M.; Malcherek, E.; Marsteller, A.; Martin, E. L.; Melzer, C.; Menshikov, A.; Mertens, S.; Mostafa, J.; Müller, K.; Neumann, H.; Oelpmann, P.; Parno, D. S.; Poyato, J. M. L.; Priester, F.; Ramachandran, S.; Robertson, R. G. H.; Rodejohann, W.; Röllig, M.; Röttele, C.; Rodenbeck, C.; Ryšavý, M.; Sack, R.; Saenz, A.; Schäfer, P.; Schaller née Pollithy, A.; Schimpf, L.; Schlösser, K.; Schlösser, M.; Schlüter, L.; Schrank, M.; Schulz, B.; Schwemmer, A.; Šefčík, M.; Sibille, V.; Siegmann, D.; Slezák, M.; Sun, M.; Telle, H. H.; Thümmler, T.; Titov, N.; Tkachev, I.; Urban, K.; Vizcaya Hernández, A. P.; Weinheimer, C.; Welte, S.; Wendel, J.; Wilkerson, J. F.; Wüstling, S.; Wydra, J.; Zadoroghny, S.; Zeller, G.
Nature physics, 02/2022, Letnik: 18, Številka: 2Journal Article
Abstract Since the discovery of neutrino oscillations, we know that neutrinos have non-zero mass. However, the absolute neutrino-mass scale remains unknown. Here we report the upper limits on effective electron anti-neutrino mass, m ν , from the second physics run of the Karlsruhe Tritium Neutrino experiment. In this experiment, m ν is probed via a high-precision measurement of the tritium β -decay spectrum close to its endpoint. This method is independent of any cosmological model and does not rely on assumptions whether the neutrino is a Dirac or Majorana particle. By increasing the source activity and reducing the background with respect to the first physics campaign, we reached a sensitivity on m ν of 0.7 eV c –2 at a 90% confidence level (CL). The best fit to the spectral data yields $${{\mbox{}}}{m}_{\nu }^{2}{{\mbox{}}}$$ m ν 2 = (0.26 ± 0.34) eV 2 c –4 , resulting in an upper limit of m ν < 0.9 eV c –2 at 90% CL. By combining this result with the first neutrino-mass campaign, we find an upper limit of m ν < 0.8 eV c –2 at 90% CL.
