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Light yield non-proportionality of LYSO scintillator and measurement of the Birks-Onsager quenching parameters.
Nicolaidis R., Nozzoli F., Ghezzer L.E.
The scintillation response of a Ce-doped lutetium-yttrium oxyorthosilicate (LYSO) scintillator crystal to gamma rays is investigated and a non-proportionality of the light yield for sub-MeV gamma rays is measured. The effect of the Birks scintillation quenching of relatively slow electrons produced by low-energy gamma ray in the scintillator is investigated with a dedicated GEANT4 simulation to describe the measured light yield non-proportionality. The Birks-Onsager parameters inferred for low-energy electrons with this method are compared with the ones measured in LYSO using multi-GeV nuclei and hundreds-MeV proton beams. This comparison is a powerful probe of the underlying light yield quenching theory. Experimental measurements and result comparisons will be shown.