Abstract
We have tested the timing properties of several thin plastic scintillators (10–500μm) designed for the Rare-RI Ring project at the RI beam factory. The experiments were performed at the heavy-ion synchrotron facility, HIMAC (Heavy Ion Medical Accelerator in Chiba), using a Xe beam with an energy of 200MeV/nucleon. The scintillation light was read out by fast-timing photomultipliers through standard fishtail-shaped light guides. The resultant timing resolutions reached a few tens of picoseconds, which satisfied our requirement for the project. We also measured charge-state distributions for Xe42+ and Fe20+ ions penetrating carbon foils of 10–500μg/cm2 thickness. The results were compared with a theoretical model calculation for charge-state evolution.
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