A study for the use of the LNS crystal ball multidetector as a neutral pions spectrometer

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Abstract

The response of the large BaF2 multidetector Crystall Ball to high energy photons and neutral pions was studied by simulations carried out with the code GEANT3. The properties of the detector relevant to π0 detection, such as resolution, linearity and efficiency are discussed. The performance of the system can be improved by considering a cluster of 8 detectors around the illuminated one to follow the development of the electromagnetic shower. As a π0 spectrometer the Crystal Ball covers the whole angular range and permits the detection of π0's over 100 MeV kinetic energy. Estimated π0 efficiencies vary between 60% for pio emitted at rest to 35% at 100 MeV kinetic energy.

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