Cyclotron Radiation Emission Spectroscopy of Electrons from Tritium Beta Decay and \(^{83\rm m}\)Kr Internal Conversion

Project 8 has developed a novel technique, Cyclotron Radiation Emission Spectroscopy (CRES), for direct neutrino mass measurements. A CRES-based experiment on the beta spectrum of tritium has been carried out in a small-volume apparatus. We provide a detailed account of the experiment, focusing on s...

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Published in:arXiv.org 2023-12
Main Authors: Project 8 Collaboration, A Ashtari Esfahani, Böser, S, Buzinsky, N, Carmona-Benitez, M C, Claessens, C, de Viveiros, L, Doe, P J, Fertl, M, maggio, J A, Gaison, J K, Gladstone, L, Guigue, M, Hartse, J, Heeger, K M, Huyan, X, Jones, A M, Kazkaz, K, LaRoque, B H, M Li, Lindman, A, Machado, E, Marsteller, A, Matthé, C, Mohiuddin, R, Monreal, B, Mueller, R, Nikkel, J A, Novitski, E, Oblath, N S, Peña, J I, Pettus, W, Reimann, R, Robertson, R G H, Rosa De Jesús, D, Rybka, G, Saldaña, L, Schram, M, Slocum, P L, Stachurska, J, Y -H Sun, Surukuchi, P T, Tedeschi, J R, Telles, A B, Thomas, F, Thomas, M, Thorne, L A, Thümmler, T, Tvrznikova, L, Van De Pontseele, W, VanDevender, B A, Weintroub, J, Weiss, T E, Wendler, T, Young, A, Zayas, E, Ziegler, A
Format: Article
Language:English
Subjects:
Beta decay
Cyclotron radiation
Cyclotrons
Electrons
Emission spectroscopy
Energy resolution
Internal conversion
Neutrinos
Tritium
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Summary:Project 8 has developed a novel technique, Cyclotron Radiation Emission Spectroscopy (CRES), for direct neutrino mass measurements. A CRES-based experiment on the beta spectrum of tritium has been carried out in a small-volume apparatus. We provide a detailed account of the experiment, focusing on systematic effects and analysis techniques. In a Bayesian (frequentist) analysis, we measure the tritium endpoint as \(18553^{+18}_{-19}\) (\(18548^{+19}_{-19}\)) eV and set upper limits of 155 (152) eV (90% C.L.) on the neutrino mass. No background events are observed beyond the endpoint in 82 days of running. We also demonstrate an energy resolution of \(1.66\pm0.19\) eV in a resolution-optimized magnetic trap configuration by measuring \(^{83\rm m}\)Kr 17.8-keV internal-conversion electrons. These measurements establish CRES as a low-background, high-resolution technique with the potential to advance neutrino mass sensitivity.
ISSN:2331-8422