Time Analysis of the Partially Equipped CALICE Analog Hadronic Calorimeter Technological Prototype with Tungsten Absorber

This note presents the analysis of timing measurements obtained with a partially in- strumented technological prototype of the CALICE analog hadronic calorimeter (AHCAL) in a tungsten absorber stack. The data was taken during a test beam campaign in August 2015 at the SPS at CERN. A calibration procedure for time measurements is presented and the complex time structure of hadronic showers is analyzed and compared to several Geant4 physics lists. For pi- ons, late energy depositions are observed as expected due to the capture of low energetic neutrons. Physics lists using the binary cascade to model low energetic hadronic processes underestimate these late energy depositions, while physics lists using the Bertini model or the high precision package overestimate them by about a factor two. The late component of hadronic showers is found to be about eight times larger than for a similar analysis with a steel absorber.