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1826191191507468288
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MIT
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© 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.
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2024-09-23T08:51:53Z
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Article
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mit-1721.1/136554
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Massachusetts Institute of Technology
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| language |
English
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2024-09-23T08:51:53Z
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2021
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| publisher |
American Physical Society (APS)
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dspace
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| spelling |
mit-1721.1/1365542022-04-01T17:20:50Z Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN © 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. 2021-10-27T20:35:54Z 2021-10-27T20:35:54Z 2019 2021-06-25T13:22:20Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136554 en 10.1103/PHYSREVLETT.123.221802 Physical Review Letters Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Physical Society (APS) APS
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| spellingShingle |
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
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| title |
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
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| title_full |
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
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| title_fullStr |
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
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| title_full_unstemmed |
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
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| title_short |
Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN
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| title_sort |
improved upper limit on the neutrino mass from a direct kinematic method by katrin
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| url |
https://hdl.handle.net/1721.1/136554
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