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A high-energy resolution observed from a YAP:Ce scintillator

1999; Elsevier BV; Volume: 421; Issue: 3 Linguagem: Inglês

10.1016/s0168-9002(98)01232-7

1872-9576

M. Kapusta, Marcin Balcerzyk, M. Moszyński, Jörg Pawelke,

Particle Detector Development and Performance

An energy resolution of 4.38±0.11% was obtained for 662 keV γ-rays with a 3×3×20 mm3 YAP : Ce crystal with its long face coupled to an XP2020Q photomultiplier. The measured number of photoelectrons of 5290±80 phe/MeV implies a photoelectron statistical contribution of 4.18±0.04% and hence a YAP intrinsic energy resolution of 1.3±0.5%, the lowest value ever observed for scintillators. The relative light output of the YAP crystal measured for energies between 14.4 keV and 1.275 MeV was constant within ±2%. These observations are consistent with the assumption that there is a direct correlation between the energy resolution of scintillators and nonproportionality of their light output versus energy.