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Eight production quality PbWO 4 crystals of CMS have been irradiated in a 20GeV/c proton beam up to fluences of 5.4×1013cm-2. The damage recovery in these crystals has been followed for over a year. Comparative irradiations with 60 Co photons have been performed on seven other crystals using a dose rate of 1kGy/h. In proton-irradiated crystals the light transmission band-edge shifts...
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