Three-dimensional amplitude-time analysis of γγ coincidences with usage of semiconductor detectors

The system for three-dimensional amplitude-time analysis of gamma coincidences, containing two li-drifted Ge detectors and one scintillation detector, is described. The HP 2116C computer is used as control and recording system. The einterface electronic equipment is constructed according to a standard fast-slow accumulation scheme. The process of information accumulation sorting and processing is considered in detail. Process of collection of information with its further magnetic tape recording is realized by SAVE3 computer code. Two buffers are singled out in the computer memory. When one buffer is filling in, the second one is processing and after the filling in of one buffer they change places. Acceleration of the sorting of three-dimensional coincidences is realized by the optimization of a central processor operation and by creation of a large additional buffer in mass memory. Brief descriptions of the computer code for data calibration and computer codes for one- dimensional gamma spectra processing are also presented. Several examples are given, which illustrate possibilities of the system for three-dimensional analysis to study the schemes of radioactive nuclei decay in particular, the 161Y→161Tm decay scheme is given