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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| Main Authors: | , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
14 February 2022
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| In: |
Nature physics
Year: 2022, Volume: 18, Issue: 2, Pages: 160-166 |
| ISSN: | 1745-2481 |
| DOI: | 10.1038/s41567-021-01463-1 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/s41567-021-01463-1 Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/s41567-021-01463-1 
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| Author Notes: | the KATRIN collaboration |
| Summary: | 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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| Item Description: | Das PDF enthält zusätzlich einen Anhang von 11 Seiten The KATRIN collaboration: M. Aker, F. Spanier, W. Rodejohann [und weitere 131 Verfasser] Gesehen am 23.03.2022 |
| Physical Description: | Online Resource |
| ISSN: | 1745-2481 |
| DOI: | 10.1038/s41567-021-01463-1 |