Estimate of the Chemical Composition of Cosmic Rays from a Multifractal Moments Analysis of the Lateral Particle Distributions in the Core of High-Energy EAS

Physics – Nuclear Physics

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Scientific paper

The central detector of the KASCADE experiment, which is focused to investigate the chemical composition of primary cosmic rays by EAS observations in the energy range of 1014 eV to 1017 eV, is able to observe the density distributions of the EAS components in the shower core, in particular of the muons by large-area position-sensitive multiwire proportional chambers (MWPC), installed below an iron sampling calorimeter (~ 1000 g/cm2 Fe) used for hadron measurements. Using a method based on the determination of multifractal moments the appearance of the density distributions of the EAS core in the MWPC has been analyzed. Results with EAS simulations indicate distinct signatures for the mass of the primary. We communicate first results extracted from measurements with the MWPC combined with measurements of the energy deposit in the timing and trigger facility (segmented scintillation detector plane as third active layer of the calorimeter) of the KASCADE central detector.

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