Abstract
A CsI(Tl) crystal of 9.5 cm diameter and 30 cm length was tested with electrons and pions in the momentum range from 0.2 to 1.5 GeV/ c. Photodiode and photomultiplier readouts were used for comparison. In the photodiode readout, the fwhm energy resolution for electrons was 6.7% at 1 GeV in agreement with the EGS simulation. The e/π separation for momentum analyzed particles was found to be 1/1000 at 1 GeV/ c with a simple energy cut. The pulse heith nonuniformity along the longitudinal position, scanned with a pencial beam of 1 GeV/ c pions, was smaller than ±4% between 4 and 27 cm from photomultiplier.
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