A scintillating LXe/LKr electromagnetic calorimeter has been built at the ITEP and tested at the BATES (MIT) accelerator. The detector consists of PMT matrix and 45 light collecting cells made of aluminized 50 microns Mylar partially covered with p-terphenyle as a wavelength-shifter (WLS). Each pyramidal cell has (2.1/spl times/2.1)/spl times/40/spl times/(4.15/spl times/4.15) cm dimensions and is viewed by FEU-85 glass-window photomultiplier. The detector has been exposed at 106-348 MeV electron beam. The energy resolution /spl sigma//sub E//E/spl cong/5%//spl radic/E at 100-350 MeV range in LXe, the coordinate resolution /spl sigma//sub x//spl cong/0.7, the time resolution /spl sigma//sub t//spl cong/0.6 ns for single cell have been obtained. Possible ways to improve energy resolution are discussed.<>

Liquid and solid krypton have been studied as scintillators. Attenuation length for Kr scintillation light was determined to be about 1m, after the Kr was purified by a hot Ca-getter and by a Ti discharge purifier in liquid phase. Two detectors (75 and 51 in size, respectively) were tested as stop-counters in a time-of-flight experiment using 1–2 GeV/c particle beams at the ITEP accelerator. A FWHM time resolution of ~2 ns was achieved. Using Si-PhD to detect the scintillation light in liquid and solid Kr. resolution of 16% (FWHM) for α(239Pu)-scintillation was achieved in both liquid and solid Kr.