Abstract

Twofold coincidence rates for associated pairs of cosmic-ray particles have been measured at sea level as a function of their (small) horizontal separation. The parallel plate spark counters used had a time resolution of 5 × 10-9 second. Simultaneously with the rates, measurements of the time intervals between the arrival of the two particles at a given horizontal plane were made, both for counters in air and under 18 cm Pb.

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