Abstract

The KASCADE-Grande experiment, located at Campus North of the Karlsruhe Institute of Technology (Ger- many) is a multi-component extensive air-shower experiment devoted to the study of cosmic rays and their interactions at primary energies 10 14 − 10 18 eV. One of the main goals of the experiment is the measurement of the all particle en- ergy spectrum in the 10 16 − 10 18 eV range, i.e. extending the range accessible by KASCADE alone. The Grande detec- tor samples the charged component (Nch) of the air shower while the original KASCADE array provides in addition a measurement of the muon component (Nµ). The combined information of Nch and Nµ is used to estimate the energy on an event-by-event basis and to derive the all-particle energy spectrum. Since the calibration of the observables in terms of the primary energy depends on Monte Carlo simulations, three different methods with partially different sources of un-

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