A pulse shape discrimination of CsI(Tl) crystal with He-6 beam

The performance test of a CsI(Tl) crystal (70x27x23 mm(3)) was performed by applying the pulse shape discrimination technique for identification of light charged particles. The crystal is coupled to a photomultiplier tube during an experiment with He-6 beam. The pulse waveform is fully recorded by employing a high precision digital oscilloscope. The fast and slow gates are used for the pulse shape discrimination and the best values for the gate widths were determined to be 0.5 mu s and 1.67 mu s, respectively. The He-6, He-4 and He-3 are successfully discriminated with this technique.