Title: First Observation of Cyclotron Radiation from MeV-Scale e± following Nuclear β Decay

Journal Article · · Physical Review Letters
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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 6He and β+’s from 19Ne 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. Furthermore, 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Texas A&M University, College Station, TX (United States). Cyclotron Institute
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
He6-CRES Collaboration
Grant/Contract Number:
AC02-06CH11357; AC05-76RL01830; FG02-93ER40773; FG02-97ER41020; NA0003841
OSTI ID:
2008091
Report Number(s):
PNNL-33312
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 131; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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