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Saltzberg D, Gorham P, Walz D, et al. Observation of the Askaryan effect: coherent microwave Cherenkov emission from charge asymmetry in high-energy particle cascades. Phys Rev Lett. 2001;86(13):2802-5doi: 10.1103/PhysRevLett.86.2802.
Saltzberg, D., Gorham, P., Walz, D., Field, C., Iverson, R., Odian, A., Resch, G., Schoessow, P., & Williams, D. (2001). Observation of the Askaryan effect: coherent microwave Cherenkov emission from charge asymmetry in high-energy particle cascades. Physical review letters, 86(13), 2802-5. https://doi.org/10.1103/PhysRevLett.86.2802
Saltzberg, D, et al. "Observation of the Askaryan effect: coherent microwave Cherenkov emission from charge asymmetry in high-energy particle cascades." Physical review letters vol. 86,13 (2001): 2802-5. doi: https://doi.org/10.1103/PhysRevLett.86.2802
Saltzberg D, Gorham P, Walz D, Field C, Iverson R, Odian A, Resch G, Schoessow P, Williams D. Observation of the Askaryan effect: coherent microwave Cherenkov emission from charge asymmetry in high-energy particle cascades. Phys Rev Lett. 2001 Mar 26;86(13):2802-5. doi: 10.1103/PhysRevLett.86.2802. PMID: 11290043.
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Phys Rev Lett. 2001 Mar 26;86(13):2802-5. doi: 10.1103/PhysRevLett.86.2802.

Observation of the Askaryan effect: coherent microwave Cherenkov emission from charge asymmetry in high-energy particle cascades.

Physical review letters

D Saltzberg, P Gorham, D Walz, C Field, R Iverson, A Odian, G Resch, P Schoessow, D Williams

Affiliations

  1. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA.

PMID: 11290043 DOI: 10.1103/PhysRevLett.86.2802

Abstract

We present the first direct experimental evidence for the charge excess in high-energy particle showers and corresponding radio emission predicted nearly 40 years ago by Askaryan. We directed picosecond pulses of GeV bremsstrahlung photons at the SLAC Final Focus Test Beam into a 3.5 ton silica sand target, producing electromagnetic showers several meters long. A series of antennas spanning 0.3 to 6 GHz detected strong, subnanosecond radio-frequency pulses produced by the showers. Measurements of the polarization, coherence, timing, field strength vs shower depth, and field strength vs frequency are completely consistent with predictions. These measurements thus provide strong support for experiments designed to detect high-energy cosmic rays such as neutrinos via coherent radio emission from their cascades.

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