Author/Authors :
Aggarwal، نويسنده , , M.M. and Badyal، نويسنده , , S.K. and Bhalla، نويسنده , , K.B. and Bhatia، نويسنده , , V.S. and Chattopadhyay، نويسنده , , S. and Das، نويسنده , , A.C. and Devanand and Dutta Majumdar، نويسنده , , M.R. and Ganti، نويسنده , , Murthy S. and Garcha، نويسنده , , B.S. and Ghosh، نويسنده , , T.K. and Gupta، نويسنده , , S.K. and Gutbrod، نويسنده , , H.H. and Kachroo، نويسنده , , S. and Kolb، نويسنده , , B، نويسنده ,
Abstract :
A fine granularity preshower detector has been designed, fabricated and installed in the WA93 experiment for the first ever measurement of photon multiplicity in ultra-relativistic heavy ion collisions. Photons are counted by detecting the preshower signal in plastic scintillator pads placed behind a lead converter and applying a threshold on the scintillator signal to reject the minimum ionizing particles. The photon detection efficiency estimated using Monte-Carlo and beam test results is found to be ∼65–75% depending on centrality. Simulation and performance results of the detector for counting of photons and rejection of hadrons in the large multiplicity environment of ultra-relativistic heavy ion collisions are described.
