Scintillating LXe/LKr electromagnetic calorimeter

A scintillating LXe/LKr electromagnetic calorimeter has been built at the ITEP and tested at the BATES (MIT) accelerator. The detector consists of a PMT matrix and 45 light collecting cells made of aluminized Mylar partially covered with p-terphenyl 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 an FEU-85 glass-window photomultiplier. The detector has been exposed to the 106-348 MeV electron beam. The energy resolution is /spl sigma//sub E//E/spl sime/5%//spl radic/E at the 100-350 MeV range in LXe; the coordinate resolution is /spl sigma/X/spl sime/0.7 cm; the time resolution is /spl sigma//sub /spl tau///spl sime/0.6 ns for a single cell. Possible ways to improve energy resolution are discussed.