Abstract
Ultra high-energy (UHE) neutrino (1015 eV <) detection in natural huge rock salt formation has been studied. Radio wave is generated by Askar'yan effect in rock salt. That is caused by the number asymmetry of electrons and positrons (excess charge) in electromagnetic shower from an UHE neutrino. An Electromagnetic shower in rock salt is generated by a computer code of Geant4.5. A modified Greisen parameterization in longitudinal distribution of the shower and a modified Nishimura, Kamata, and Greisen function in lateral distribution of the shower (structure function) are fitted to a space distribution of the excess electrons. The structure function would assist to calculate radio wave emission without using an electromagnetic shower simulation.
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