Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN

0518405 - ÚJF 2020 RIV US eng J - Článek v odborném periodiku
Aker, M. - Altenmuller, K. - Arenz, M. - Babutzka, M. - Dragoun, Otokar - Kovalík, Alojz - Lebeda, Ondřej - Ryšavý, Miloš - Vénos, Drahoslav - Zbořil, Miroslav … celkem 210 autorů
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN.
Physical Review Letters. Roč. 123, č. 22 (2019), č. článku 221802. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT LM2015056; GA MŠMT LTT19005
Institucionální podpora: RVO:61389005
Klíčová slova: neutrino mass * KATRIN * cosmological studies
Obor OECD: Particles and field physics
Impakt faktor: 8.385, rok: 2019
Způsob publikování: Open access
https://doi.org/10.1103/PhysRevLett.123.221802

We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic end point at 18.57 keV gives an effective neutrino mass square value of (-1.0(-1.1)(+0.9)) eV(2). From this, we derive an upper limit of 1.1 eV (90% confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of 2 and provides model-independent input to cosmological studies of structure formation.
Trvalý link: http://hdl.handle.net/11104/0303552