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arXiv · 2303.12055

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

Project 8 Collaboration·A. Ashtari Esfahani·S. Böser·N. Buzinsky·M. C. Carmona-Benitez·C. Claessens·L. de Viveiros·P. J. Doe·M. Fertl·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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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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Project 8 Collaboration, A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens, L. de Viveiros, P. J. Doe, M. Fertl, 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. 2023-03-21. Cyclotron Radiation Emission Spectroscopy of Electrons from Tritium Beta Decay and $^{83\rm m}$Kr Internal Conversion. https://doi.org/10.1103/physrevc.109.035503

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