Abstract
A reliable triple coincidence system for low energy γ-rays with both good time and energy resolution, high detection efficiency and high singles counting rate capibility was required for a 3-quanta positron decay experiment. NaI(TI) detector-153 AVP photomultiplier integral-lines have been selected; by a suitable integrating and standardizing circuit remarkable time resolution has been achieved notwithstanding that the intrinsic time resolution capability of both the detector and the photomultiplier is not the highest available. A general description is given of the complete coincidence system, which includes a fast coincidence-anticoincidence, delay line differenting amplifiers, single channel analysers, linear gates and a supervisory coincidence to combine energy and time requirements. The system tested with 511 keV resolution at 100% coincidence efficiency, better than 6 ns at 95% efficiency, with about 10% energy resolution and good counting rate capability. A 3-quanta positron measurement is described, which shows the accuracy of the instrument.
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