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

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arxiv 2212.05048 v2 pith:MSWB3R3H submitted 2022-12-09 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. Grando M. Guigue J. Hartse K. M. Heeger X. Huyan J. Johnston 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 massneutrinolimitscaletritiumbetaspectrumanalysis
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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 cm$^3$-scale physical detection volume, a limit of $m_\beta{<}$155 eV ($152$ eV) is extracted from the background-free measurement of the continuous tritium beta spectrum in a Bayesian (frequentist) analysis. Using $^{83{\rm m}}$Kr calibration data, an improved resolution of 1.66${\pm}$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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Measuring Cosmic Neutrino Masses Independently of Dark Energy

    astro-ph.CO 2026-07 accept novelty 6.0 of 10

    Two dark-energy-robust cosmological routes bound ∑mν to <0.152 eV (marginalized) and <0.41 eV (late-Universe-free), with the latter independent of tested w(a) models by construction.

  2. 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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