@article{byron_harrington_taylor_degraw_buzinsky_dodson_fertl_garcía_garvey_graner_et al._2023, title={First Observation of Cyclotron Radiation from MeV-Scale 
e  following Nuclear β Decay}, volume={131}, ISSN={0031-9007 1079-7114}, url={http://dx.doi.org/10.1103/PhysRevLett.131.082502}, DOI={10.1103/PhysRevLett.131.082502}, abstractNote={We present an apparatus for detection of cyclotron radiation yielding a frequency-based β^{±} kinetic energy determination in the 5 keV to 2.1 MeV range, characteristic of nuclear β decays. The cyclotron frequency of the radiating β particles in a magnetic field is used to determine the β energy precisely. Our work establishes the foundation to apply the cyclotron radiation emission spectroscopy (CRES) technique, developed by the Project 8 Collaboration, far beyond the 18-keV tritium endpoint region. We report initial measurements of β^{-}'s from ^{6}He and β^{+}'s from ^{19}Ne decays to demonstrate the broadband response of our detection system and assess potential systematic uncertainties for β spectroscopy over the full (MeV) energy range. To our knowledge, this is the first direct observation of cyclotron radiation from individual highly relativistic β's in a waveguide. This work establishes the application of CRES to a variety of nuclei, opening its reach to searches for new physics beyond the TeV scale via precision β-decay measurements.}, number={8}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Byron, W. and Harrington, H. and Taylor, R. J. and DeGraw, W. and Buzinsky, N. and Dodson, B. and Fertl, M. and García, A. and Garvey, G. and Graner, B. and et al.}, year={2023}, month={Aug}, pages={082502} }