APPLICATION OF TAIL SUBTRACTION TECHNIQUE WITH PARTICLE IDENTIFICATION TO A STACKED SPECTROMETER FOR INTERMEDIATE-ENERGY PROTONS

A solid detector for intermediate energy protons needs a thick materia l to stop incident protons. The response function of detector has a fu ll-energy peak and a tail when monochromatic energy protons are measur ed by the detector. A tail subtraction technique with particle identif ication was applied to remove the tail. The Gaussian distribution was fitted to a peak in a particle identification spectrum. In this techni que, the window of three times of standard deviation in the peak regio n was found to be proper in analysing the particle identification spec trum. Using this technique, the tail could be removed. The peak effici encies of the stacked spectrometer for protons were obtained up to 250 MeV.