Abstract
The results of measurements of the rise-time of muon scintillator responses recorded from extensive air showers detected at Haverah Park are described. A high-speed storage oscilloscope recording system has been used to study both the average characteristics of muon time spreads and the fluctuations in arrival-time distributions between individual showers. The average muon time spreads are found to be a function of core distance, zenith angle and muon threshold energy. There is evidence that velocity delays are an important contribution to the muon rise-times for detectors with threshold energies <or approximately=500 MeV. Significant fluctuations in the muon time spreads between individual showers are found. The average characteristics of the muon arrival-time distributions are also compared with the shower computer simulations.
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