Radiation damage of heavy crystalline detector materials by 24 GeV protons

摘要

Samples of three heavy crystalline materials: PbWO_4, Bi_4Si_3O~(12), and PbF_2 were irradiated in a high-intensity 24 GeV proton beam at the CERN PS to fluencies of 3.8 × 10~(13) protons/cm~2. The optical transmission radiation damage was measured and all crystals show a shift of the cutoff in the transmission spectrum that is not observed when the crystals are irradiated with y radiation. This shift of the cutoff under proton irradiation seems to be a general property of the heavy crystalline materials. A mechanism for this proton-induced transmission damage is discussed.