Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
Name
PhysRevLett.123.221802.pdf
Description
Published version
Size
677.39 KB
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Checksum (MD5)
6288c528f42e8aedc45efed4f5a713b8
Author(s)
KATRIN Collaboration
Barrett, John
Corona, Thomas Joseph
Formaggio, Joseph A
Furse, Daniel Lawrence
Kaboth, Asher Cunningham
Solomon-Oblath, Noah
Sibille, Valerian
Xu, W.
Date Issued
2019
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2019 authors. Published by the American Physical Society. 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) 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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.123.221802
