Description: After two and a half years of development and construction, an electronic 4..pi.. detector has been used for the first time in studying relativistic nuclear collisions. This detector complements the visual 4..pi.. detectors like emulsions, AgCl detectors, and the streamer chamber, which have been in use for many years. Only the streamer chamber has the same important feature as the Plastic Ball in being triggerable for specific event types. In a series of experiments with beams of /sup 20/Ne, /sup 40/Ar, and /sup 40/Ca up to energies of 1.05 GeV/u, approximately three million events were measured with various trigger conditions. In contrast to the visual detectors, these events are already totally digitized and ready for immediate analysis. All multiparticle correlations of charged particles are measured in each event and do not have to be determined as an average quantity from two particle inclusive data. Besides the particle identification of the hydrogen and helium isotopes, the Plastic Ball identifies the positive pions. This makes it interesting for the study of pion production, which sets in at around 100 MeV/u incident energy, and has promise to shed some light onto the equation of state of nuclear matter. Besides the analysis of the data in the standard way of selections and of single particle inclusive data, a global analysis is in progress that should allow us to determine the reaction plane, and the event shape in phase space. The operation and general layout of the Plastic Ball are described. (WHK)
Date: March 1, 1982
Creator: Gutbrod, H.H.; Baden, A. & Loehner, H.
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