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                                 Abstract:This paper describes a 2m threshold gas cerenkov counter for identifing π,K,Pparticles with momenta of 5 to 10 GeV/c. Velocity resolution of 3.5×10-5 has beenachieved. Detection efficieney on plateau is more than 99.99%. The rejection factorfor particle with energy below threshold is about 1.6×10-5.
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