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New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs
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SYSNO ASEP 0559940 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs Author(s) Aker, M. (DE)
Batzler, D. (DE)
Beglarian, A. (DE)
Behrens, J. (DE)
Dragoun, Otokar (UJF-V) RID, SAI
Kovalík, Alojz (UJF-V) RID, ORCID, SAI
Lebeda, Ondřej (UJF-V) RID, ORCID, SAI
Ráliš, Jan (UJF-V) SAI
Ryšavý, Miloš (UJF-V) RID, ORCID, SAI
Šefčík, Michal (UJF-V) ORCID, SAI
Vénos, Drahoslav (UJF-V) RID, SAI, ORCIDNumber of authors 131 Article number 011806 Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 129, č. 1 (2022)Number of pages 7 s. Publication form Print - P Language eng - English Country US - United States Keywords KATRIN experiment ; neutrino OECD category Astronomy (including astrophysics,space science) R&D Projects LTT19005 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CANAM II - 90056 - Ústav jaderné fyziky AV ČR, v. v. i. Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000834755600008 EID SCOPUS 85134501147 DOI 10.1103/PhysRevLett.129.011806 Annotation 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 eta < 9.7 x 10(10)/alpha (1.1 x 10(11)/alpha) at a 90% (95%) confidence level with alpha = 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 eta < 1 x 10(10)/alpha at 90% confidence level, by relying on updated operational conditions. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2023 Electronic address https://doi.org/10.1103/PhysRevLett.129.011806
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