The Capability Research Of The Particle Identification Of The CsI(Tl) Crystal

In study of the experimental nuclear physics and the nuclear technology,the radiation what we measured usually accompany with substantial unexpected radiations.For instance,the neutron field always accompany with substantial gamma rays.In the study of(n,x)reaction, many kinds of charged particle can be produced.Therefore,the particle identification(PID) technology must be applied in order to get the correct result.In this work,three methods are applied to study the PID of a CsI(T1)crystal carefully.As is well known,in many scintillation crystals,the decay of the light emitted by the charged particles consists of two components of the signal that are the fast and slow ones.Their intensities are relevant to ionization density and therefore depend on the mass,charge and energy of the detected particles.Based on the pulse-shape-discrimination(PSD)of the CsI(T1)crystal,The zero-crossing method,the rise time method and the charge comparison method are used to realize the good PID forα,γand p particles.During the experiment,the base of the PMT and the electronic parameters were optimized. Then the signals were recorded by the CAMAC data acquisition system with list mode.The data were analyzed in detail with Kmax software package and good PID had been obtained.Among the three different methods,the zero-crossing method shows the best result because it can reach a lowest energy limit which can separate light charged particles well.The rise time method and the charge comparison method have similar capability for the PID.In many nuclear physics experiments,substantial interference radiations can be excluded only good PID could be obtained.The CsI(T1)detectors developed in this work will be used for (n,x)reaction research in the future.Therefore,the study of the PID of the CsI(T1)crystal is very important and meaningful.