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A "Lead-Glass Wall," consisting of 318 lead-glass Cherenkov shower counters and three wire spark chambers, has been added to one octant of the SPEAR Mark I Magnetic Detector. The wall covers a solid angle of approximately 6% of 4?? steradians and has been used to identify and measure the energies of electrons and photons produced in electron-positron collisions. The design, calibration,...
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