New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs
Affiliations
- 1 Tritium Laboratory Karlsruhe (TLK), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 2 Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 3 Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 4 Institute for Nuclear Research of Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312 Moscow, Russia.
- 5 Institute for Nuclear Physics, University of Münster, Wilhelm-Klemm-Strasse 9, 48149 Münster, Germany.
- 6 Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany.
- 7 Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 8 Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany.
- 9 Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany.
- 10 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
- 11 Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA.
- 12 Institute for Nuclear and Particle Astrophysics and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
- 13 Department of Physics, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany.
- 14 Departamento de Química Física Aplicada, Universidad Autonoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain.
- 15 Center for Experimental Nuclear Physics and Astrophysics, and Dept. of Physics, University of Washington, Seattle, Washington 98195, USA.
- 16 Nuclear Physics Institute, Czech Academy of Sciences, 25068 Řež, Czech Republic.
- 17 Laboratory for Nuclear Science, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, Massachusetts 02139, USA.
- 18 Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
- 19 IRFU (DPhP & APC), CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
- 20 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
- 21 Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany.
- 22 Institute for Theoretical Astrophysics, University of Heidelberg, Albert-Ueberle-Strasse 2, 69120 Heidelberg, Germany.
- 23 Institut für Physik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz, Germany.
- PMID: 35841544
- DOI: 10.1103/PhysRevLett.129.011806
New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs
Authors
Affiliations
- 1 Tritium Laboratory Karlsruhe (TLK), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 2 Institute for Data Processing and Electronics (IPE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 3 Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 4 Institute for Nuclear Research of Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312 Moscow, Russia.
- 5 Institute for Nuclear Physics, University of Münster, Wilhelm-Klemm-Strasse 9, 48149 Münster, Germany.
- 6 Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany.
- 7 Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
- 8 Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany.
- 9 Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany.
- 10 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
- 11 Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA.
- 12 Institute for Nuclear and Particle Astrophysics and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
- 13 Department of Physics, Faculty of Mathematics and Natural Sciences, University of Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany.
- 14 Departamento de Química Física Aplicada, Universidad Autonoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain.
- 15 Center for Experimental Nuclear Physics and Astrophysics, and Dept. of Physics, University of Washington, Seattle, Washington 98195, USA.
- 16 Nuclear Physics Institute, Czech Academy of Sciences, 25068 Řež, Czech Republic.
- 17 Laboratory for Nuclear Science, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, Massachusetts 02139, USA.
- 18 Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
- 19 IRFU (DPhP & APC), CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
- 20 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
- 21 Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany.
- 22 Institute for Theoretical Astrophysics, University of Heidelberg, Albert-Ueberle-Strasse 2, 69120 Heidelberg, Germany.
- 23 Institut für Physik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz, Germany.
- PMID: 35841544
- DOI: 10.1103/PhysRevLett.129.011806
Abstract
We report on the direct search for cosmic relic neutrinos using data acquired during the first two science campaigns of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the end point at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity ratio of η<9.7×10^{10}/α (1.1×10^{11}/α) at a 90% (95%) confidence level with α=1 (0.5) for Majorana (Dirac) neutrinos. A fit of the integrated electron spectrum over a narrow interval around the end point accounting for relic neutrino captures in the tritium source reveals no significant overdensity. This work improves the results obtained by the previous neutrino mass experiments at Los Alamos and Troitsk. We furthermore update the projected final sensitivity of the KATRIN experiment to η<1×10^{10}/α at 90% confidence level, by relying on updated operational conditions.