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

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arxiv 2303.12055 v3 pith:NYXMZFDV submitted 2023-03-21 nucl-ex hep-ex

Project 8 Collaboration: A. Ashtari Esfahani , S. Böser , N. Buzinsky , M. C. Carmona-Benitez , C. Claessens , L. de Viveiros , P. J. Doe , M. Fertl
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J. A. Formaggio J. K. Gaison L. Gladstone M. Guigue J. Hartse K. M. Heeger X. Huyan A. M. Jones K. Kazkaz B. H. LaRoque M. Li A. Lindman E. Machado A. Marsteller C. Matthé R. Mohiuddin B. Monreal R. Mueller J. A. Nikkel E. Novitski N. S. Oblath J. I. Peña W. Pettus R. Reimann R. G. H. Robertson D. Rosa De Jesús G. Rybka L. Saldaña M. Schram P. L. Slocum J. Stachurska Y.-H. Sun P. T. Surukuchi J. R. Tedeschi A. B. Telles F. Thomas M. Thomas L. A. Thorne T. Thümmler L. Tvrznikova W. Van De Pontseele B. A. VanDevender J. Weintroub T. E. Weiss T. Wendler A. Young E. Zayas A. Ziegler
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classification nucl-exhep-ex
keywords massneutrinotritiumanalysisbetacrescyclotronelectrons
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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.

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  1. The real-time data processing and acquisition system for Project 8 Phase II

    physics.ins-det 2025-06 conditional novelty 6.0 of 10

    An FPGA plus software frequency-mask trigger records CRES events with 96.7% data reduction and under 0.5% efficiency variation for the Project 8 Phase II neutrino mass experiment.

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