@article{3038417,
    title = "Use of a large multicell ionization detector - The external particle identifier - In experiments with the BEBC hydrogen bubble chamber",
    author = "Baruzzi, V. and Carosio, R. and Crijns, F. and Gerdyukov, L. and Goldschmidt-Clermont, Y. and Grant, A. and Johnson, D. and Kröner, F. and Lehraus, I. and Matthewson, R. and Milstene, C. and Nikolaenko, V. and Oren, Y. and Petrovikh, Y. and Ross, R.T. and Sixel, P. and Spyropoulou-Stassinaki, M. and Stergiou, A. and Tejessy, W. and Theocharopoulos, P. and Vassiliadis, G. and Wright, P.R.S. and Zoll, J.",
    journal = "Nuclear Instruments and Methods in Physics Research",
    year = "1983",
    volume = "207",
    number = "3",
    pages = "339-356",
    issn = "0167-5087",
    doi = "10.1016/0167-5087(83)90645-2",
    keywords = "CHARGED PARTICLES - Measurements, IONIZATION CHAMBERS",
    abstract = "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."
}