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Direct neutrino-mass measurement with sub-electronvolt sensitivity

SYSNO ASEP	0554740
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Direct neutrino-mass measurement with sub-electronvolt sensitivity
Author(s)	Aker, M. (DE) Beglarian, A. (DE) Behrens, J. (DE) Berlev, A. I. (RU) Besserer, U. (DE) Dragoun, Otokar (UJF-V)_{RID, SAI} Kovalík, Alojz (UJF-V)_{RID, ORCID, SAI} Lebeda, Ondřej (UJF-V)_{RID, ORCID, SAI} Ryšavý, Miloš (UJF-V)_{RID, ORCID, SAI} Vénos, Drahoslav (UJF-V)_{RID, SAI, ORCID}
Number of authors	133
Source Title	Nature Physics. - : Nature Publishing Group - ISSN 1745-2473 Roč. 18, č. 2 (2022), s. 160-166
Number of pages	18 s.
Publication form	Print - P
Language	eng - English
Country	DE - Germany
Keywords	KATRIN ; neutrinos ; neutrino mass
OECD category	Particles and field physics
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	000755220000019
EID SCOPUS	85126257490
DOI	10.1038/s41567-021-01463-1
Annotation	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.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2023
Electronic address	https://doi.org/10.1038/s41567-021-01463-1

Number of the records: 1