Author/Authors :
Aggarwal، نويسنده , , M.M. and Agnihotri، نويسنده , , A. and Ahammed، نويسنده , , Z. and Baba، نويسنده , , P.V.K.S. 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 Dutta Majumdar، نويسنده , , M.R. and Ganti، نويسنده , , M.S. and Ghosh، نويسنده , , T.K. and Gupta، نويسنده , , S.K. and Gutbrod، نويسنده , , H.H. and Kachr، نويسنده ,
Abstract :
A high granularity preshower detector has been fabricated and installed in the WA98 Experiment at the CERN SPS for measuring the spatial distribution of photons produced in the forward region in lead-ion-induced interactions. Photons are counted by detecting the preshower signal in plastic scintillator pads placed behind a 3 radiation length thick lead converter and applying a threshold on the scintillator signal to reject the minimum ionizing particles. Techniques to improve the imaging of the fibre and performance of the detector in the high multiplicity environment of lead–lead collisions are described. Using Monte-Carlo simulation methods and test beam data of π− and e− at various energies the photon counting efficiency is estimated to be 68% for central and 73% for peripheral Pb+Pb collisions.
Keywords :
WA98 experiment , Preshower detector , Photon multiplicity detector , quark gluon plasma
