A measurement of the response of an SCG1-C scintillation glass array to 4–14 GeV/c pions

Abstract An SCG1-C scintillation glass detector consisting of a 3.5 radiation length SCG1-C active converter followed by scintillation and gas tube hodoscopes and a 4 × 4 array of a 20.5 radiation length SCG1-C counters has been exposed to pions in the 4–14 GeV/ c momentum range. The response of this detector to pions is compared with the response to electrons of the same momentum in order to study the capability of such a detector to distinguish the two types of particles. Using only longitudinal and tranverse shower development criteria, the electrons and pions can be separated such that on average 1.1 × 10 −1 of all pions in the range of 4–14 Gev/ c would be misidentified as electrons of any energy. If the momentum of the incident particle is known and can be used in the identification technique, this average fraction is reduced to 6.4 × 10 −3 of all pions misidentified as electrons of the same momentum.