TY - JOUR
TI - Use of a large multicell ionization detector - The external particle identifier - In experiments with the BEBC hydrogen bubble chamber
AU - Baruzzi, V.
AU - Carosio, R.
AU - Crijns, F.
AU - Gerdyukov, L.
AU - Goldschmidt-Clermont, Y.
AU - Grant, A.
AU - Johnson, D.
AU - Kröner, F.
AU - Lehraus, I.
AU - Matthewson, R.
AU - Milstene, C.
AU - Nikolaenko, V.
AU - Oren, Y.
AU - Petrovikh, Y.
AU - Ross, R.T.
AU - Sixel, P.
AU - Spyropoulou-Stassinaki, M.
AU - Stergiou, A.
AU - Tejessy, W.
AU - Theocharopoulos, P.
AU - Vassiliadis, G.
AU - Wright, P.R.S.
AU - Zoll, J.
JO - Nuclear Instruments and Methods in Physics Research
PY - 1983
VL - 207
TODO - 3
SP - 339-356
PB - 
SN - 0167-5087
TODO - 10.1016/0167-5087(83)90645-2
TODO - CHARGED PARTICLES - Measurements, IONIZATION CHAMBERS
TODO - Fast secondary particles from interactions of K+ at 70 GeV/c and K- at 110 GeV/c in the BEBC hydrogen bubble chamber are identified by use of the relativistic rise of ionization in argon. The ionization is measured in a large multicell ionization counter system, the External Particle Identifier (EPI). The operation of this hybrid system, the calibration and the procedures of off-line analysis leading to particle identification are described. For a sample of 9283 secondary particles collected in the K+ p experiment, we present the measurements of ionization, and the determination of acceptance and identification efficiencies. The momentum-dependent populations of pions, kaons and protons have been obtained. Track by track identification procedures yielding samples of pions and kaons with a contamination {less-than or approximate} 12% are discussed. A study of the resolution of the EPI in these experimental conditions shows average values in a range of 7.6% to 11% depending on the number of ionization samples remaining after removal of background. These values extrapolate to a value consistent with the 6.6% fwhm measured over the whole device for single particles during calibration with a 50 GeV/c π- beam. © 1983.
ER -