Abstract

AN attempt has been made, using two different experimental arrangements, to detect delayed particles in extensive air showers. In the first experiment (carried out under a thick concrete roof at University College, Dublin) extensive showers were selected by coincidences of three trays of Geiger-Muler counters, each tray of area 750 cm.2. The trays were placed at the apices of a triangle of sides 5.3, 7.3 and 8.5 metres. Pulses from a fourth tray of area 360 cm.2 occurring 1.4–11.4µsec. later were recorded.

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