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

作者：A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens, L. de Viveiros, P. J. Doe, M. Fertl, Joseph A. Formaggio, J. K. Gaison, L. Gladstone, M. Grando, M. Guigue, J. Hartse, Karsten M. Heeger, X. Huyan, J. Johnston, Mark Jones, K. Kazkaz, B. H. LaRoque, Mingshan Li, A. Lindman, E. Machado, A. Marsteller, C. Matthé, R. Mohiuddin, B. Monreal, R. Mueller, James A. Nikkel, E. Novitski, Noah S. Oblath, J. I. Peña, W. Pettus, R. Reimann, R. G. H. Robertson, D. Rosa De Jesús, G. Rybka, L. Saldaña, Malachi Schram, Penny L Slocum, Juliana Stachurska, Yu-Hao Sun, Pranava Teja Surukuchi, J. R. Tedeschi, A. B. Telles, F. Thomas, M. Thomas, Larisa A. Thorne, T. Thümmler, L. Tvrznikova, W. Van De Pontseele, Brent A. VanDevender, Jonathan Weintroub, T. E. Weiss, Tim Wendler, Anthony M. Young, E. Zayas, A. Ziegler · 发表于：Physical Review Letters · 年份：2023 · DOI：10.1103/physrevlett.131.102502 · 被引用次数：49 · 研究领域：Neutrino Physics Research、Astrophysics and Cosmic Phenomena、Particle physics theoretical and experimental studies

The absolute scale of the neutrino mass plays a critical role in physics at every scale, from the subatomic to the cosmological. Measurements of the tritium end-point 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 cm^{3}-scale physical detection volume, a limit of m_{β}<155 eV/c^{2} (152 eV/c^{2}) is extracted from the background-free measurement of the continuous tritium beta spectrum in a Bayesian (frequentist) analysis. Using ^{83m}Kr calibration data, a 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.