Percolation and cosmic ray physics above $10^{17}$eV
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We argue that the energy dependence of the average position of the shower maximum, $\bar X_{max}$, and of the number of produced muons, $N_μ$, can be explained by a change, around $10^{17}$eV, in the energy dependence of the inelasticity $K$, which decreases with the energy above the string percolation threshold.
8 pages, 4 figures (6 eps files), latex
8 pages, 4 figures (6 eps files), latex