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A scintillating LXe/LKr electromagnetic calorimeter has been built at the ITEP and tested at the BATES @UT) 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 . 1~2 . 1 )~4 0~( 4 . 1 5~4 . 1 5 ) 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 a~f E % 5 % / a at 100-350 MeV range in LXe; the coordinate resolution is ax N 0.7 cm; the time resolution is U , % 0.6 LIS for a single cell. Possible ways to improve energy resolution are discussed.

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The objective of this study is to demonstrate the feasibility of constructing a compact neutron detector that is sensitive to thermal and epithermal neutrons and has high rejection efficiency relative to gamma-ray background. A two-channel high-pressure 3 He scintillation detector is considered for the detection of neutrons in coincidence mode. The detector consists of two large avalanche photodiodes viewing a gas volume filled with pressurized 3 He. Experiments with the detector demonstrate high efficiency to neutrons and high rejection ability to gamma rays. Position sensitivity of the detector to thermal neutrons is demonstrated and confirmed with computer simulations.