Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
Karlsruhe Institute of Technology · Commissariat à l'Énergie Atomique et aux Énergies Alternatives · +22 more institutions
Abstract
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…
Citation impact
- FWCI
- 154.65
- Percentile
- 100%
- References
- 70
Authors
210- MAM. AkerCorresponding
Karlsruhe Institute of Technology
- KAK. Altenmüller
Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Max Planck Institute for Physics, CEA Paris-Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Technical University of Munich
- MAM. Arenz
University of Bonn
- MBM. Babutzka
Karlsruhe Institute of Technology
- JBJohn Barrett
Massachusetts Institute of Technology
Topics & keywords
- KATRIN
- Neutrino
- Physics
- Electron neutrino
- Nuclear physics
- Kinematics
- Particle physics
- Electron
- Affordable and clean energy
Funding
- UDU.S. Department of EnergyAwards: DE-FG02-97ER41041, DE-FG02-97ER41033, DE-FG02-94ER40818, DE-SC0019304, DE-AC02-05CH11231, DE-SC0004036, DE-FG02-97ER41020, DE-SC0011091
- NENational Energy Research Scientific Computing CenterAwards: 05CH11231, AC02-05CH11231
- DFDeutsche ForschungsgemeinschaftAwards: GSC 1085, DE-AC02-05CH11231, GRK 1694, GSC 1085—KSETA, GSC 1085-KSETA, GRK 2149
- MŠMinisterstvo Školství, Mládeže a TělovýchovyAwards: LTT19005, CANAM-LM2011019
- BFBundesministerium für Bildung und ForschungAwards: 05A17VK2, 05A17PM3, 5A17PDA, 05A17WO3, 05A17PX3, DE-AC02-05CH11231
- MMax-Planck-Gesellschaft
- HAHelmholtz AssociationAward: VH-NG-1055
- HAHelmholtz Alliance for Astroparticle Physics
- KSKarlsruhe School of Elementary Particle and Astroparticle Physics: Science and Technology, Karlsruhe Institute of TechnologyAward: GSC 1085-KSETA