- Askaryan effect
The Askaryan effect describes a phenomenon, similar to the
Cerenkov effect , whereby a particle travelling faster than thespeed of light in a dense radiotransparent medium such as salt, ice or thelunar regolith produces a shower of secondary charged particles which contain a chargeanisotropy and thus emits a cone ofcoherent radiation in the radio ormicrowave part of theelectromagnetic spectrum . So far the effect has been observed in silica sand [ [http://arxiv.org/abs/hep-ex/0011001 Observation of the Askaryan Effect in Silica Sand] ] , rock salt [ [http://lanl.arxiv.org/abs/astro-ph/0412128 Observation of the Askaryan Effect in Rock Salt] ] , and ice [ [http://xxx.lanl.gov/abs/hep-ex/0611008 Observation of the Askaryan Effect in Ice] ] and is of primary interest in using bulk matter to detect ultra-high energyneutrino s. The effect is named after its postulator, physicistGurgen Askaryan (1928-1997).ANITA
The (Antarctic Impulsive Transient Antenna) ANITA experiment is to be the first experiment to identify high energy neutrinos created by collisions between cosmic rays and the cosmic microwave photons that pervade the Universe, a source of neutrinos that creates an opportunity to study the laws of high-energy physics. This experiment exploits the Askaryan Effect. At these energies, neutrino collisions with matter could produce micro-black holes, or other exotic manifestations of theories that attempt to unify all forces of Nature. [ [http://www.ps.uci.edu/~anita/ ANITA Project Overview] ] The balloon-borne payload will circle the continent of Antarctica at ~35,000 meters, scanning the vast expanses of ice for telltale pulses of radio emission generated by the neutrino collisions. This project is as of June 2006 being tested at the
Stanford Linear Accelerator Center [ [http://www-conf.slac.stanford.edu/saber/proc/PAPERS/C02.PDF ANITA Overview] ] .References
External links
* [http://www.physics.ucla.edu/~moonemp/radhep/proc/proc.html RADHEP-2000 Write-ups]
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