An experiment to measure the electromagnetic size of the n meson was performed at the Serpukhov accelerator in 1970-1971 /1/.. One part of the experimental setup was a Čerenkov total absorption counter for selecting; scattered electrons. The counter was constructed at the Laboratory of High Energies, JINR. The counter was used in two ways in the experiment. The first method (particle identification) consisted of the detection of the momentum amplitude in each trigger; the second used the detection of a signal above a fixed threshold as a trigger for the setup.
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