Experimental study and Monte Carlo modeling of the Cherenkov effect

Studies realised at the Institute for Nuclear Research and Nuclear Energy ( INRNE) particularly in cosmic ray detection and construction of Muonic Cher enkov Telescope at the South West University "Neofit Rilski" Blagoevgrad sh ow the need to develop a theoretical model based on observed phenomena and to refinement of this for detection system optimisation. The Cherenkov effe ct was introduced in EGS4 code system. The first simulations realised in co llaboration between the french and the bulgarian team were consecrated to d ifferent geometries of water tank in total reflection, An additional modeli ng of photons mean trajectory and the mean number of reflections in the tan k were made. This simple model was compared with experimental data realised with Co-60 gamma source, the telescope and the most efficient water tank. A trajectory simulation of Cherenkov photons in water tank was made. An eff iciency estimation of the detector registration was calculated. The atmosph eric model was introduced in EGS4 code and a comparison between CORSIKA5.62 and EGS4 codes was made. (C) 2001 Elsevier Science B.V. All rights reserve d.