Lead tungstate scintillation crystal with increased light yield for the PANDA electromagnetic calorimeter

Scintillation crystals of lead tungstate PbWO4 with increased light yield are described. The scintillation with maximum emission at 420 nm is rather fast and 97% of light are emitted within an integration gate of 100 ns width at operating temperatures in the range of 310-250 K. The light yield of samples of 1 cm3 volume increases from 41 to 66 phe/MeV in the temperature range 296-258 K. More than 10.000 full size scintillation crystals of such quality are considered for the construction of the electromagnetic calorimeter of the PANDA detector proposed for experiments at the antiproton storage ring of the future accelerator facility at GSI, Darmstadt.