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Light charged particle identification by means of digital pulse shape acquisition in the CHIMERA CsI(Tl) detectors at GSI energies

We report the results obtained by applying digital pulse shape acquisition and digital signal processing to the signals from CsI(Tl) scintillators read out by photodiodes at high incident energy (400 MeV/u). The digitized signals allows the discrimination of light charged particles by computing the Fast and Slow components and the Rise Time of the output pulses of the CsI(Tl). When the energies of the light charged particles exceed those corresponding to their ranges in CsI(Tl), the points related to the punching-through particles gather in the corresponding scatter plots giving rise to a cusp. The punching-through points are used as energy calibration points for the reaction products stopped in the CsI(Tl). The obtained results suggest that at relativistic beam energies it is possible to perform efficient discrimination in charge and mass of light charged particles by using the energy vs. rise time computation.