Abstract
AbstractA three channel spectrometer for studying three‐photon annihilation is reported. It is based on a fast‐fast coincidence circuit and includes NaJ(Tl) scintillation detectors, constant fraction differential discriminators, a fast coincidence circuit with variable resolving time (6 ns—60 ns), a linear gate and a multichannel analyzer.The possibility of using positron source 64Cu in the spectrometer, its advantages and disadvantages are discussed. In this connection we describe the special units coupled to the spectrometer as well as a method which helps to avoid the influence of the short decay time of 64Cu of the accuracy of the experimental results.
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