Energy Spectrum and Mass Composition at the Knee Energy

We present results of EAS registration by the Lodz extensive air shower (EAS) array. The trigger is the coincidence of at least four scintillation detectors separated by 30 m. The electron and muon (E> 0.5 GeV) densities can be estimated from the hodoscopic arrays. Interpretation of experimental results in terms of the mass composition and energy spectrum of EAS near and above the knee energy will be presented. We made required simulation (based on the CORSIKA results) of EAS development. As the result of simulation we obtained distributions of number of hit hodoscopic units for electron and muon arrays separately and correlations between them. Direct comparison between the data and simulated distributions made with different assumptions about the primary CR energy spectrum and mass composition shows large sensitivity of the method to the models of primary CR spectra.