FAZA - EXPERIMENTAL SYSTEM FOR THE STUDY OF NUCLEAR FRAGMENTATION

A modified 4 pi-system PHASE is described, which is intended for study ing multiple fragmentation reactions in a target bombarded by relativi stic light nuclei on the synchrophasotron of the Joint Institute for N uclear Research (JINR, Dubna). The setup contains five telescope spect rometers with a resolution of Delta Z/Z < 7% and an array of 64 scinti llation detectors with large-area CsI(TI) film scintillator (20-25 mg/ cm(2); approximate to 150 cm(2)), which allow the multiplicity of inte rmediate-mass fragments and their distributions with respect to escape angles to be determined. The use of a new construction of optical gui des increased the optical resolution of scintillation detectors by a f actor of 1.4, decreased scatter of the resolution of various counters relative to the average value, and significantly suppressed the backgr ound caused by the beam halo.