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A compact homogenous electromagnetic calorimeter with an energy resolution of better than 5%/E/GeV, made out of lanthanum-doped lead tungstate crystals from Bogoroditsk, Russia, has been built for use in the ZEUS detector. The whole calorimeter, composed of 4x4 crystals, each of dimensions 23.8x23.8x200mm 3 , light guides and photomultipliers, fits into a space of 12x12x27cm 3 . Beam...
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