On the primary mass sensitivity of muon pseudorapidities measured with KASCADE-Grande

With the Muon Tracking Detector in the KASCADE-Grande experiment mean EAS muon pseudorapidities are investigated. Here we report on the results of studying the sensitivity of this quantity to the mass of primary cosmic ray particles. Obtained values of the mean logarithmic mass in the 10 16 eV - 10 17 eV range of primary energies, based on the QGSJetII - FLUKA interaction model combination, are compared with the results of other experiments. The validity of the model in reproducing experimentally measured pseudorapidity values and its comparison with the EPOS 1.99 is discussed.