COSMIC-RAY HADRON FLUX AT SEA-LEVEL UP TO 15 TEV

Using a prototype of a large hadron calorimeter, vertical cosmic ray h adrons were recorded and the all-hadron flux was measured in the range from 5 GeV to 10 TeV. Hadron reconstruction and identification are de scribed. We observe a vertical flux of dI/dE(h) = (1.59 +/- 0.24) x 10 (-5) (E(h)/100 GeV)-2.72+/-0.10 (m2 s sr GeV)-1. The flux compares wel l with values obtained in other experiments. Total inelastic cross sec tions for protons scattered by nuclei in air are deduced from the unac companied hadron flux and compared with the values reported by other a uthors.