KASCADE-GRANDE RESULTS AND FUTURE PROSPECTS FOR THE TRANSITION ENERGY RANGE OF COSMIC RAYS

Investigations of the energy spectrum as well as the mass composition of cosmic rays in the energy range of PeV to EeV are important for understanding both, the origin of the galactic and the extragalactic cosmic rays. The multi-detector arrangement of KASCADE and its extension KASCADE-Grande was designed for observations of cosmic ray air showers in this energy range. The experimental installation was completed in 2013, however, the collaboration continues to analyse the recorded data. In this contribution, we discuss the status and results of recent analyses in particular in view of tests of the validity of hadronic interaction models used for the interpretation of measured air-shower data.