Study of CR primaries and their cascades at Eo=10-100 tev through EAS-TOP and MACRO

A measurement of the lateral distribution of Cherenkov light in Extensive Air Showers (EAS) at Eo=10 ÷ 100 TeV and a study of the compatibility of the photon number spectra with the expectations from the direct measurements of p and a spectra and the Corsika-QGSJET propagation code in the atmosphere have been performed at the National Gran Sasso Laboratories by the EAS-TOP and MACRO arrays. The telescope array of EAS-TOP has been used as the Cherenkov light detector. The muon tracking system of MACRO in the deep underground Gran Sasso Laboratories (E mu > 1.3 TeV) served as the EAS detector, including core localization and arrival direction.