Single-electron detection and spectroscopy via relativistic cyclotron radiation

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Abstract

It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Although first derived in 1904, cyclotron radiation from a single electron orbiting in a magnetic field has never been observed directly. We demonstrate single-electron detection in a novel radio-frequency spectrometer. The relativistic shift in the cyclotron frequency permits a precise electron energy measurement. Precise beta electron spectroscopy from gaseous radiation sources is a key technique in modern efforts to measure the neutrino mass via the tritium decay end point, and this work demonstrates a fundamentally new approach to precision beta spectroscopy for future neutrino mass experiments.

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Asner, D. M., Bradley, R. F., De Viveiros, L., Doe, P. J., Fernandes, J. L., Fertl, M., … Woods, N. L. (2015). Single-electron detection and spectroscopy via relativistic cyclotron radiation. Physical Review Letters, 114(16). https://doi.org/10.1103/PhysRevLett.114.162501

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