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Cloud-Chamber Study of Meson Disintegration

1P21, beyond which voltage it falls rapidly; it is inde- pendent of the potential applied to the remaining seven stages. An over-all gain of 25 million is then achieved by operating stages one and two-at 120 volts each, and stages three through nine at 180 volts each. Pulse heights of 20 volts and more are then observed, which are sufficient to feed directly into oscilloscopes, coincidence, mixers, etc., without recourse to additional vacuum-tube amplification. Since upwards of 1500 volts appear between adjacent anode and cathode pins, certain precautions were taken, such as slotting the base and socket, and wax impregnation. Since the peak current in the last few stages is quite high, these were by-passed with small mica capacitors. For visual pulse observation, the photo-multiplier was mounted at the neck of an oscilloscope tube of the 5JP1 variety, with very short connections. The signal pulses showed a finite rise time of about 0.05 microsecond; this figure represents the period over which appreciable light emission by the anthracene takes place, the photo-multiplier output circuit being effectively an integrator of the photo- electrons. Variation of the decrement of the output circuit (by changing the load resistor) showed that pulse height http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

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