Beam Test of a BSO Calorimeter(I. Nuclear Physics)

概要

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The response of an electromagnetic calorimeter of large bismuth silicate (BSO) crystals has been measured for the first time for electrons, positrons, and charged pions at the incident momentum ranging from 0.5 to 3.0 GeV/c. The calorimeter consists of 9 BSO crystals arranged in a 3×3 matrix. The size of each crystal is 22mm×22mm×180mm (15.6 radiation lengths). The energy resolution of (σ_E/E)^2=(0.024±0.003√<E[GeV])^2>+(0.018±0.002)^2 has been obtained for incident electrons. The position information for the electrons injected onto the center crystal is given with energy deposit signals from 9 BSO crystals. The obtained position resolution is better than 5 mm in this energy range. The misidentification probability of pions to electrons is found to be 〜10^<-3> in the energy range from 1.0 to 3.0 GeV.
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