Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-06-22
IEEE Trans.Nucl.Sci. 48 (2001) 144-149
Physics
Nuclear Physics
Nuclear Experiment
LaTeX, 6 pages, 6 figures
Scientific paper
For the first time, lead fluoride is used as a fast and compact material in electromagnetic calorimetry. Excellent optical and mechanical properties of the pure Cherenkov crystals are necessary for the A4 collaboration to perform a measurement of the nucleon's strange form factors. Visible scattering and absorption centers as well as surface damages have been investigated to characterize the quality of more than one thousand crystals. Besides, transmittance measurements have been performed on all crystals to reveal absorption bands produced by intrinsic or impurity related point-structure defects. As a consequence, 89 crystals had to be replaced by the Chinese manufacturer SICCAS.
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