Detection inefficiency of a 10 mm thick plastic scintillation counter for 1 GeV/c e±, π± and protons

The detection inefficiency of a 10 mm thick plastic scintillation counter for charged particles (1 GeV/c e±, π± and protons) was examined in a test experiment at the T1 line of the KEK 12 GeV Proton Synchrotron. The inefficiencies for e+ and π− were obtained to be (3.2 ± 0.9) × 10−4 and (6.0 ± 0.6) × 10−4; those for π+ and e− were obtained as the upper limits of 1.6 × 10−5 and 1.3 × 10−4 in the case that the energy deposit was required to be more than 1 MeV in the scintillator. For protons, the inefficiency was obtained to be (5.0 ± 1.6) × 10−5 in the case that the energy deposit was required to be more than 1.9 MeV in the scintillator. For e±, the ADC spectra of the output signals as well as the obtained inefficiencies were well reproduced by calculations using the EGS4 code.