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Tritium Beta Spectrum Measurement and Neutrino Mass Limit from Cyclotron Radiation Emission Spectroscopy

Project 8 Collaboration; Ashtari Esfahani, A.; Böser, S.; Buzinsky, N.; Carmona-Benitez, M. C.; Claessens, C.; Viveiros, L. de; Doe, P. J.; Fertl, M.; Formaggio, J. A.; Gaison, J. K.; Gladstone, L.; Grando, M.; Guigue, M.; Hartse, J.; Heeger, K. M.; Huyan, X.; Johnston, J.; Jones, A. M.; ... mehr

Abstract:

The absolute scale of the neutrino mass plays a critical role in physics at every scale, from the particle to the cosmological. Measurements of the tritium endpoint spectrum have provided the most precise direct limit on the neutrino mass scale. In this Letter, we present advances by Project 8 to the Cyclotron Radiation Emission Spectroscopy (CRES) technique culminating in the first frequency-based neutrino mass limit. With only a cm3-scale physical detection volume, a limit of mβ<155eV(152eV) is extracted from the background-free measurement of the continuous tritium beta spectrum in a Bayesian (frequentist) analysis. Using 83mKr calibration data, an improved resolution of 1.66±0.19 eV (FWHM) is measured, the detector response model is validated, and the efficiency is characterized over the multi-keV tritium analysis window. These measurements establish the potential of CRES for a high-sensitivity next-generation direct neutrino mass experiment featuring low background and high resolution.

Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2022
Sprache Englisch
Identifikator KITopen-ID: 1000166076
Umfang 7 S.
Vorab online veröffentlicht am 09.12.2022
Nachgewiesen in arXiv
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Relationen in KITopen

Volltext §
DOI: 10.5445/IR/1000166076
Veröffentlicht am 28.12.2023
Seitenaufrufe: 43
seit 28.12.2023
Downloads: 40
seit 28.12.2023
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