Göttingen 1997 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 10: Detektoren I

HK 10.1: Vortrag

Montag, 24. März 1997, 14:00–14:15, HS L

Performance of the Large Area Scintillator Wall at COSY-11 — •Usama Seddik¹ and die COSY-11² — ¹
Institut f"ur Kernphysik, Forschungszentrum J"ulich, D-52425 J"ulich — ²

The stop detector of the internal COSY-11 experiment is a scintillator wall with the dimensions 220×100× 5 cm³ viewed from the back by 217 photomultipliers. The dependence of the number of fired photomultipliers (’multiplicity’) upon particle velocity is investigated. The data of an experiment with a beam momentum of p_b=2.345 GeV/c were used. It was found that the multiplicity is independent on the hit position. The efficiency of the detector as a function of the particle velocity will be discussed. We further examined the summed signal amplitude as a means for the identification of two charged particles hitting the scintillator wall with small relative distance.