期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.221802
关键词
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资金
- Helmholtz Association
- Ministry for Education and Research BMBF [5A17PDA, 05A17PM3, 05A17PX3, 05A17VK2, 05A17WO3]
- Helmholtz Alliance for Astroparticle Physics (HAP), Helmholtz Young Investigator Group [VH-NG-1055]
- Max Planck Research Group (MaxPlanck@TUM)
- Deutsche Forschungsgemeinschaft DFG in Germany [GRK 1694, GRK 2149, GSC 1085-KSETA]
- Ministry of Education, Youth and Sport in the Czech Republic [CANAM-LM2011019, LTT19005]
- United States Department of Energy [DE-FG02-97ER41020, DE-FG02-94ER40818, DESC0004036, DE-FG02-97ER41033, DE-FG0297ER41041, DE-AC02-05CH11231, DE-SC0011091, DE-SC0019304]
- National Energy Research Scientific Computing Center
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.
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