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Direct neutrino-mass measurement with sub-electronvolt sensitivity

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, mν, from the second physics run of the Karlsruhe Tritium Neutrino experiment....

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Hauptverfasser: Aker, Max (VerfasserIn) , Rodejohann, Werner (VerfasserIn) , Spanier, Felix (VerfasserIn)
Körperschaft: KATRIN (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 14 February 2022
In: Nature physics
Year: 2022, Jahrgang: 18, Heft: 2, Pages: 160-166
ISSN:1745-2481
DOI:10.1038/s41567-021-01463-1
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/s41567-021-01463-1
Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/s41567-021-01463-1
Volltext
Verfasserangaben:the KATRIN collaboration

MARC

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520 |a 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, mν, from the second physics run of the Karlsruhe Tritium Neutrino experiment. In this experiment, mν 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 mν of 0.7 eV c-2 at a 90% confidence level (CL). The best fit to the spectral data yields $${{\mbox{}}}{m}_{\nu }^{2}{{\mbox{}}}$$ = (0.26 ± 0.34) eV2 c-4, resulting in an upper limit of mν < 0.9 eV c-2 at 90% CL. By combining this result with the first neutrino-mass campaign, we find an upper limit of mν < 0.8 eV c-2 at 90% CL. 
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