Detector system for the angular distribution measurement of 12C + 12C elastic scattering at 200–400A MeV

Abstract To obtain the angular distributions of 12 C + 12 C elastic scatterings with the incident energies of 200–400 A  MeV for the study of three-body forces, a detector system was constructed at second Radioactive Ion Beam Line in Lanzhou (RIBLL2) of Institute of Modern Physics (IMP). This system was composed of five plastic scintillation detectors with two read-outs for each detector, a Multi Wire Proportional Chamber (MWPC) and a 4×4 CsI(Tl) array. The 12 C beam with the incident energy of 200 A  MeV on a natural carbon target was used to test this detector system. It is found that the plastic scintillation detector can give the good energy loss ( Δ E ) and time of flight (TOF) signals, it can also reflect the position information of scattered 12 C events. MWPC can precisely provide the trajectories of scattered particles. This system has a very good particle identification ability and can clearly distinguish the scattered 12 C particles from the fragments. It can be used for the study of the three-body forces effect for high energy heavy-ion scattering.