Search for elongated spatial structures in hadronic shower cores with KASCADE

In this analysis the structure of hadronic shower cores is investigated with the KASCADE calorimeter. The energy, position, and direction of incidence for individual hadrons above 50 GeV are measured. In parallel, the spatial structure is studied using the simulation program CORSIKA with the hadronic interaction model QGSJET. First results are presented for the showers with primary energies above 5 PeV. Elongated cores are observed more frequently than expected from random coincidence., This proves that KASCADE is sensitive to hadronic interaction producing elongated structures. Alignment can be found in both data sets - measurements and simulation. No significant deviation between them or hints for new physics have been found so far.