The Durham extensive air shower array. I

An extensive air shower array of characteristic radius 60 m has been built, and is in operation at Durham, England, 40 m above sea level. The array incorporates 14 plastic and 8 liquid scintillation counters having areas varying from 2 m2 to 0.26 m2. The fast timing technique is used to determine the arrival directions of the showers. The array is sensitive to showers of size 105-3x106 particles. Near the centre of the array are situated the 300 t Durham muon spectrograph and the Durham flash-tube chamber. The data are stored in an on-line computer attached to the apparatus. (Auth.)