How to deal with PCR composition problem at $E_0 \gtrsim 10^{17}$ eV
Basic ideas of muon tracker technique for the solution of primary cosmic ray (PCR) composition problem in the energy range $10^{17}-10^{18}$ eV are presented. The approach uses MC simulation data made with CORSIKA6.990 for "Pamir-XXI" site conditions. Similar technology can certainly be developed for other observation levels and interaction models. One can probably extend it to much higher primary energies.
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