A STUDY ON THE PENETRATIVE NATURE OF HADRON-INDUCED CASCADE SHOWERS IN A THICK LEAD CHAMBER

The three-dimensional development of cascade showers in lead initiated by high energy proton-Pb and pion-Pb interactions are calculated by a full Monte Carlo simulation assuming a simple geometrical model for h adron-nucleus interactions and also taking into account the exact geom etrical structure of the Pamir thick lead chamber. It is shown that fl uctuations in the shower development are very large but the experiment al hadronic cascade shower transition has a more gentle slope, in shap e, than the one calculated, and the extraordinary long penetrating sho wers found in the experiment can not be explained by simple fluctuatio ns of the calculated shower development. (C) 1997 Elsevier Science B.V .