Method of fast event selection

A system of fast event selection recording at the installation with proportional chambers when investigating π-meson scattering on nuclei is described. The system contains memory registers, an information coding block and a digital processor. A method for fast event selection, which is carried out by selection of such events among all possible where one particle scattering by the angle larger than the designed one takes place, is considered in detail. The system is based the integrated circuits. The total time for analysis equals 500 ns. The coefficient of event selection is about 5x103