Physical review letters · 2023
First Observation of Cyclotron Radiation from MeV-Scale e^{±} following Nuclear β Decay.
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Byron W, Harrington H, Taylor R J, DeGraw W, Buzinsky N, Dodson B, Fertl M, García A, Garvey G, Graner B, Guigue M, Hayen L, Huyan X, Khaw K S, Knutsen K, McClain D, Melconian D, Müller P, Novitski E, Oblath N S, Robertson R G H, Rybka G, Savard G, Smith E, Stancil D D, Sternberg M, Storm D W, Swanson H E, Tedeschi J R, VanDevender B A, Wietfeldt F E, Young A R, Zhu X, He6-CRES Collaboration
Аннотация
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.