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New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs

KATRIN Collaboration; Aker, M. 1; Batzler, D. 1; Beglarian, A. 2; Behrens, J. 3; Berlev, A.; Besserer, U. 1; Bieringer, B.; Block, F. 4; Bobien, S. 5; Bornschein, B. 1; Bornschein, L. 3; Böttcher, M.; Brunst, T.; Caldwell, T. S.; Carney, R. M. D.; Chilingaryan, S. ORCID iD icon 2; Choi, W. 4; Debowski, K.; ... mehr


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.

Verlagsausgabe §
DOI: 10.5445/IR/1000149475
Veröffentlicht am 10.08.2022
DOI: 10.1103/PhysRevLett.129.011806
Zitationen: 14
Web of Science
Zitationen: 11
Zitationen: 15
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 06.2022
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen-ID: 1000149475
HGF-Programm 51.13.01 (POF IV, LK 01) Neutrinophysik und Dunkle Materie
Erschienen in Physical Review Letters
Verlag American Physical Society (APS)
Band 129
Seiten Art.-Nr.: 011806
Vorab online veröffentlicht am 29.06.2022
Nachgewiesen in Web of Science
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