Ring Type Events and Nuclear Collision at SPS Energies and Nuclear Refractive Index

In this paper we performed analyses of the data obtained of various ring-like events obtained from ultra relativistic nuclear interactions of 32S-AgBr at 200 AGeV, 208Pb-AgBr at 158 AGeV and 197Au-AgBr at 11.6 AGeV in the light of Cherenkov Radiation as proposed by Dremin. The refractive index of the nuclear medium is calculated from the knowledge of incident beam energy and cone angle of radiation. This study reveals values of the refractive index of the nuclear medium different from values of nuclear medium obtained for RHIC data. (authors)