Abstract
Tests of the new XP1020 photomultipliers in a delayed coincidence apparatus using plastic scintillators are described. Prompt resolution curves were measured as a function of energy loss in the scintillators and triggering levels of the fast discriminators used to process the multiplier outputs. The best resolution obtained with ∼1 MeV loss in each scintillator was 2.1×10 −10 sec. (fwhm). The effect of finite growth and decay times of the light output from commonly used scintillators on the ultimate resolving time is considered. It is shown that the growth time, due to finite transfer times in the scintillator, has a drastic effect upon the available time resolution and is probably the limiting factor in obtainable resolution with the new photomultipliers.
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