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Novel photonspectrometer and the study of photon emission in nuclear collisions

The main research activities of the project have been concentrated on the two following directions :

1.Research and development for a photon spectrometer for the dedicated heavy ion experiment ALICE at the future CERN LHC collider.

2.Analysis of the data on the photon and neutral meson production in Pb+Pb collision at an energy of 158 GeV/nucleon of the WA98 experiment at CERN.

The following results have been achieved :
-Optimisation of the Czochralskii method for growing the lead tungstate crystals suitable for application in high energy physics has been carried out.
-Optical and radiative properties of the lead tungstate crystals have been investigated. The kinetics of luminescence of the crystals has been studied.
-A reliable technology for mashining crystal boules has been developed.
-Beam tests of a few test arrays of the lead tungstate crystals with PIN-diode photoreadouts have been performed in 1996 and 1997. It was demonstrated that the energy resolution was significantly improved as as result of carried out R&D.
-A broad program of Mone Carlo simulations of the performance of the lead tungstate photon spectrometer prototypes has been carried out.
-Preliminary analysis has been performed of the data obtained with the LEDA electromagnetic calorimeter of the WA98 experiment at CERN. An excess of photons has been observed at high transverse moments.

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