Observation of the Askar'yan Effect and Implications for UHE Neutrino Detection

Details Observation of the Askar'yan Effect and Implications for UHE Neutrino Detection Observation of the Askar'yan Effect and Implications for UHE Neutrino Detection

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..aprc14009w&link_type=abstract

American Physical Society, April Meeting, April 28 - May 1, 2001 Washington, DC Bulletin of the American Physical Society, Vol.

Physics

Scientific paper

Understanding the origin of cosmic rays with energies above the GZK limit of about 10^19 eV (1) is an outstanding problem in astroparticle physics. Some models predict a corresponding flux of ultra-high energy neutrinos. Searching for these neutrinos requires a large detector because of their low interaction cross-section. G. Askar'yan proposed an effect (2) that would allow the lunar regolith to be used as a target. When a high energy neutrino interacts with lunar material, an electromagnetic shower develops with a net 20% excess of electrons over positrons. Cherenkov radiation from this charge excess is coherent at wavelengths much larger than the shower bunch length. The corresponding microwave pulses should be detectable in Earth-based radio telescopes. (3) We present the first demonstration of this charge excess and radiation from a SLAC beamtest (4) and discuss ongoing efforts to detect these pulses from high-energy particles interacting with the Moon. (1) K. Grieson, Phys. Rev. Lett., 16, 748 (1966); G. Zatsepin and V. Kuzmin, JETP Lett., 4, 78 (1966). (2) G. Askar'yan, JETP, 14, 441, (1962). (3) R. Dagkesamanskii and I. Zheleznykh, JETP Lett., 50, 259 (1989). (4) D. Saltzberg at al, hep-ex/0011001

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