Detectional Techniques

Very high energy gamma rays (> 100 GeV) are detected using atmospheric Cherenkov technique. Gamma ray interacts at the top of the atmosphere producing electron-positron pair. Later, through various processes shower of charged particles is generated in terrestrial atmosphere. These charged particles moving at relativistic speeds cause atmosphere to emit bluish Cherenkov light. This light comes as a flash lasting for a few ns and is spread over a circular region with radius of about 100 m at observation level. This light is detected using telescope consisting of mirrors with photomultiplier tubes at the focus.





HAGAR Group: TIFR ,Room No:- C115,D307,C123,C125,D414,Homi Bhabha Road,Colaba,Mumbai, (India)
Phone : 022-22782675 Email :

Developed by : Mano Ranjan,Scientific Assistant(B),DHEP