Abstract
We have investigated the time and energy resolution (TTiming, ∆E/E) of four different scintillator materials BaF2, BC-418, LYSO and CeBr3 at a gamma energy of 511keV in views of their possible usage for time, energy and position resolution for positron annihilation experiments. The shape of each scintillator was a cylinder with a diameter of 25mm and a height of 10mm readout by a Photonis XP2020/URQ photomultiplier tube.The best single time resolution was determined for each photomultiplier–scintillator setup in a three step optimization process. The optimized single time resolutions (FWHM) for BaF2, BC-418, LYSO and CeBr3 were 119ps, 117ps, 269ps and 127ps, respectively.We measured the energy resolution of the photomultiplier–scintillator setups which show a photopeak in the energy spectrum. The energy resolutions ∆E/E of BaF2, LYSO and CeBr3 were 9.8%, 9.7% and 5.4%, respectively.The overall most promising material for measuring simultaneously time, energy and position resolution for positron annihilation experiments seems to be CeBr3 due to its very good time and energy resolution characteristics.
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