In the experiment with the SND detector at the VEPP-2000 (Formula presented.) collider, events of the process (Formula presented.) were separated via measuring, in each counter of the multichannel calorimeter based on 1640 NaI(Tl) crystals, the time of delay of the signal from nonrelativistic antineutrons. The time resolution for events of the process (Formula presented.) was 0.8 ns. The measured time spectrum of delays of the signal from antineutrons in the calorimeter at the c.m. energy of 1902 MeV agrees with the results of calculations.