Direct neutrino-mass measurement with sub-electronvolt sensitivity

Aker, M.; Beglarian, A.; Behrens, J.; Berlev, A.; Besserer, U.; Bieringer, B.; Block, F.; Bobien, S.; Böttcher, M.; Bornschein, B.; Bornschein, L.; Brunst, T.; Caldwell, T. S.; Carney, R. 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.; Ellinger, E.; Engel, R.; Enomoto, S.; Felden, A.; Formaggio, J. A.; Fränkle, F. M.; Franklin, G. B.; Friedel, F.; Fulst, A.; Gauda, K.; Gil, W.; Glück, F.; Grössle, R.; Gumbsheimer, R.; Gupta, V.; Höhn, 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.; Köhler, C.; Köllenberger, L.; Kopmann, A.; Korzeczek, M.; Kovalík, 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.; Müller, K.; Neumann, H.; Niemes, S.; Oelpmann, P.; Parno, D. S.; Poon, A. P.; Poyato, J. L.; Priester, F.; Ramachandran, S.; Robertson, R. 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.; Schneidewind, S.; Schrank, M.; Schulz, B.; Schwemmer, A.; Šefčík, M.; Sibille, V.; Siegmann, D.; Slezák, M.; Spanier, F.; Steidl, M.; Sturm, M.; Sun, M.; Tcherniakhovski, D.; Telle, H. H.; Thorne, L. A.; Thümmler, T.; Titov, N.; Tkachev, I.; Urban, K.; Valerius, K.; Vénos, D.; Vizcaya Hernández, A. P.; Weinheimer, C.; Welte, S.; Wendel, J.; Wilkerson, J. F.; Wolf, J.; Wüstling, S.; Wydra, J.; Xu, W.; Yen, Y. -R.; Zadoroghny, S.; Zeller, G.

doi:10.1038/s41567-021-01463-1

Title: Direct neutrino-mass measurement with sub-electronvolt sensitivity

Journal Article · Mon Feb 14 00:00:00 EST 2022 · Nature Physics

DOI:https://doi.org/10.1038/s41567-021-01463-1· OSTI ID:1962975

Aker, M.; Beglarian, A.; Behrens, J.; Berlev, A.; Besserer, U.; Bieringer, B.; Block, F.; Bobien, S.; Böttcher, M.; Bornschein, B.; Bornschein, L.; Brunst, T.; Caldwell, T. S.; Carney, R. D.; La Cascio, L.; Chilingaryan, S.; Choi, W.; Debowski, K.; Deffert, M.; Descher, M. more »

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 $$m_v$$ of $${\text{0.7eV}c^{-2}}$$ at a 90% confidence level (CL). The best fit to the spectral data yields $$m\frac{2}{v}=\text{(0.26 ± 0.34)eV}^2c^{-4}$$, resulting in an upper limit of $$m_v{\text{<0.9eV}}c^{-2}$$at 90% CL. By combining this result with the first neutrino-mass campaign, we find an upper limit of mν$$m_v{\text{<0.8eV}}c^{-2}$$ at 90% CL.

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Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of North Carolina, Chapel Hill, NC (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Helmholtz Association (HGF); Ministry for Education and Research BMBF; Helmholtz Alliance for Astroparticle Physics; KSETA at KIT; Helmholtz Young Investigator Group; Max Planck Research Group; German Research Foundation (DFG); Ministry of Education, Youth and Sport, Czech Republic; Ministry of Science and Higher Education of the Russian Federation; European Research Council (ERC)

Contributing Organization:: KATRIN collaboration; KATRIN Collaboration

Grant/Contract Number:: SC0019304; AC02-05CH11231; 05A17PM3; 05A17PX3; 05A17VK2; 05A17PDA; 05A17WO3; 05A20VK3; 05A20PMA; 05A20PX3; VH-NG-1055; GRK 1694; GRK 2149; GSC 1085-KSETA; SFB-1258; CANAM-LM2015056; LTT19005; 075-15-2020-778; FG02-97ER41020; FG02-94ER40818; SC0004036; FG02-97ER41033; FG02-97ER41041; SC0011091; 852845

OSTI ID:: 1962975

Alternate ID(s):: OSTI ID: 1866274; OSTI ID: 1866584; OSTI ID: 1870697; OSTI ID: 1907694; OSTI ID: 1907795

Journal Information:: Nature Physics, Vol. 18, Issue 2; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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