Abstract
A fast-storage oscilloscope and a digital transient recorder have been used to measure the rise time of pulse profiles from three types of EAS detector responding to EAS initiated by primary cosmic rays of energy between 1017 and 1018 eV. The average time spreads of the response of shielded and unshilded scintillators and deep-water Cerenkov detectors have been studied in order to develop the new recording techniques and also to attempt to derive properties of the primary particles. The new techniques have proved to represent a considerable improvement on previous methods. The analysis of results from the preliminary period of operation has proved encouraging, the data supporting other evidence indicating the lack of compatibility of “scaling” in very-high-energy nuclear interactions unless heavy primary cosmic rays are assumed. Some anomalous events are discussed.
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