Jr. Ren et al., SHOWERS WITH LARGE ZENITH ANGLES OBSERVED IN EMULSION CHAMBERS, Science in China. Series A, Mathematics, Physics, Astronomy & Technological Sciences, 40(9), 1997, pp. 985-989
Showers with large zenith angles are observed in emulsion chambers exp
osed at Mt. Kanbala. The intensity of high energy muons is given and t
he multicore showers with large zenith angles are found. It is indicat
ed that a new phenomenon may exist in the high energy nuclear interact
ions of cosmic rays.