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+0.9-1.1 eV2. 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.
Aker, M., et al. "Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN." Physical Review Letters, vol. 123, no. 22, Nov. 2019. https://doi.org/10.1103/PhysRevLett.123.221802
Aker, M., Altenmüller, K., Arenz, M., Babutzka, M., Barrett, J., Bauer, S., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Besserer, U., Blaum, K., Block, F., Bobien, S., Bokeloh, K., Bonn, J., Bornschein, B., Bornschein, L., ... Zeller, G. (2019). Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN. Physical Review Letters, 123(22). https://doi.org/10.1103/PhysRevLett.123.221802
Aker, M., Altenmüller, K., Arenz, M., et al., "Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN," Physical Review Letters 123, no. 22 (2019), https://doi.org/10.1103/PhysRevLett.123.221802
@article{osti_1575798,
author = {Aker, M. and Altenmüller, K. and Arenz, M. and Babutzka, M. and Barrett, J. and Bauer, S. and Beck, M. and Beglarian, A. and Behrens, J. and Bergmann, T. and others},
title = {Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN},
annote = {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+0.9-1.1 eV2. 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.},
doi = {10.1103/PhysRevLett.123.221802},
url = {https://www.osti.gov/biblio/1575798},
journal = {Physical Review Letters},
issn = {ISSN PRLTAO},
number = {22},
volume = {123},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2019},
month = {11}}
Carnegie Mellon Univ., Pittsburgh, PA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
Czech Ministry of Education, Youth and Sport; Deutsche Forschungsgemeinschaft (DFG); Helmholtz Alliance for Astroparticle Physics (HAP); Helmholtz Association; Helmholtz Young Investigator Group; USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)
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