Speaker
Summary
The response of pions and protons in the energy range of 20 to 180 GeV produced at
CERN's SPS H8 test beam line in the ATLAS iron-scintillator Tile hadron calorimeter
has been measured. The test-beam configuration allowed to measure the longitudinal
shower development for pions and protons up to 20 nuclear interaction lengths. It is
found that pions penetrate deeper in the calorimeter than protons. However, protons
induce showers that are wider laterally to the direction of the impinging particle.
Including the measured total energy response, the pion to proton energy ratio and
the resolution, all observations are consistent with a higher electromagnetic energy
fraction in pion induced showers. The data are compared with GEANT4 simulations
using several hadronic physics lists.
