Abstract
The density spectrum of cosmic-ray air showers has been measured using Wilson cloud chambers in two different density regions. From 50 to 500 particles per square metre the differential spectrum can be approximated by a power law of exponent - 2.5, in good agreement with many previous results. Above 1100 particles per square metre the measured exponent is - 3.9±0.5. The result is compared with recent experiments using emulsion chambers and an explanation in terms of the characteristics of high energy nuclear interactions is outlined.
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