Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 22: Postersitzung
HK 22.51: Poster
Montag, 7. März 2005, 16:30–18:00, TU MA141
Response Function of Improved PbWO 4 Crystals — •Karoly Makonyi — 2nd Physics Institute, University Giessen
The development of PbWO 4 (PWO) for LHC detectors enabled the mass production of high quality radiation hard crystals. The EM calorimeter of PANDA requires sufficient resolution over a wide range of photon energies down to 10-20 MeV. To select PWO as the appropriate fast and compact material, research started to increase the luminescence yield by quality improvement, reduction of defects, doping and operation below room temperature. Response functions of energy, time and position information to monoenergetic photons up to 800 MeV were measured at MAMI. Arrays of up to 20 cm long crystals with significantly improved light yield, manufactured in Russia and China, are investigated and operated at temperatures down to 25 degree C read-out with photomultipliers. The improvement with respect to CMS-quality crystals as well as the comparison to GEANT4 simulations will be discussed. The work is supported by BMBF, GSI and EU within the I3 Hadron Physics project.