Fitting fractions of the $X_{\rm max}$ distributions at ultra high energies
Fitting fractions of the $X_{\rm max}$ distributions at ultra high energies
The mass composition of ultra high-energy cosmic ray (UHECRs) can be inferred from measurements of $X_{\rm max}$ distributions by fitting them with Monte Carlo (MC) predictions for different primary species of nuclei in each energy interval. On the basis of Monte Carlo (MC) simulations, we show that an appropriate approach …