Direct neutrino-mass measurement with sub-electronvolt sensitivity

Aker, M.; Beglarian, A.; Behrens, J.; Berlev, A.; Besserer, U.; Bieringer, B.; Block, F.; Bobien, S.; Boettcher, M.; Bornschein, B.; Bornschein, L.; Brunst, T.; Caldwell, T. S.; Carney, R. M. D.; La Cascio, L.; Chilingaryan, S.; Choi, W.; Debowski, K.; Deffert, M.; Descher, M.; Barrero, D. Diaz; Doe, P. J.; Dragoun, O.; Drexlin, G.; Eitel, K.; Ellinger, E.; Engel, R.; Enomoto, S.; Felden, A.; Formaggio, J. A.; Fraenkle, F. M.; Franklin, G. B.; Friedel, F.; Fulst, A.; Gauda, K.; Gil, W.; Glueck, F.; Groessle, R.; Gumbsheimer, R.; Gupta, V; Hoehn, T.; Hannen, V; Haussmann, N.; Helbing, K.; Hickford, S.; Hiller, R.; Hillesheimer, D.; Hinz, D.; Houdy, T.; Huber, A.; Jansen, A.; Karl, C.; Kellerer, F.; Kellerer, J.; Kleifges, M.; Klein, M.; Koehler, C.; Koellenberger, L.; Kopmann, A.; Korzeczek, M.; Kovalik, A.; Krasch, B.; Krause, H.; Kunka, N.; Lasserre, T.; Le, T. L.; Lebeda, O.; Lehnert, B.; Lokhov, A.; Machatschek, M.; Malcherek, E.; Mark, M.; Marsteller, A.; Martin, E. L.; Melzer, C.; Menshikov, A.; Mertens, S.; Mostafa, J.; Mueller, K.; Neumann, H.; Niemes, S.; Oelpmann, P.; Parno, D. S.; Poon, A. W. P.; Poyato, J. M. L.; Priester, F.; Ramachandran, S.; Robertson, R. G. H.; Rodejohann, W.; Roellig, M.; Roettele, C.; Rodenbeck, C.; Rysavy, M.; Sack, R.; Saenz, A.; Schaefer, P.; Pollithy, A. Schaller Nee; Schimpf, L.; Schloesser, K.; Schloesser, M.; Schlueter, L.; Schneidewind, S.; Schrank, M.; Schulz, B.; Schwemmer, A.; Sibille, V; Siegmann, D.; Slezak, M.; Spanier, F.; Steidl, M.; Sturm, M.; Sun, M.; Tcherniakhovski, D.; Telle, H. H.; Thorne, L. A.; Thuemmler, T.; Titov, N.; Tkachev, I; Urban, K.; Valerius, K.; Venos, D.; Hernandez, A. P. Vizcaya; Weinheimer, C.; Welte, S.; Wendel, J.; Wilkerson, J. F.; Wolf, J.; Wuestling, S.; Wydra, J.; Xu, W.; Yen, Y-R; Zadoroghny, S.; Zeller, G.

doi:10.1038/s41567-021-01463-1

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Direct neutrino-mass measurement with sub-electronvolt sensitivity

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Rodejohann, W.
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Aker, M., Beglarian, A., Behrens, J., Berlev, A., Besserer, U., Bieringer, B., et al. (2022). Direct neutrino-mass measurement with sub-electronvolt sensitivity. Nature Physics, 18(2), 160-166. doi:10.1038/s41567-021-01463-1.

Cite as: https://hdl.handle.net/21.11116/0000-000A-DC05-9

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(nu), from the second physics run of the Karlsruhe Tritium Neutrino experiment. In this experiment, m(nu) is probed via a high-precision measurement of the tritium beta-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(nu) of 0.7 eV c(-2) at a 90% confidence level (CL). The best fit to the spectral data yields m(nu)(2) = (0.26 +/- 0.34) eV(2) c(-4), resulting in an upper limit of m(nu) < 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(nu) < 0.8 eV c(-2) at 90% CL.