Astroparticle Physics

Hadronic Interaction Models and UHECR Composition

by Sergei Ostapchenko (UHH)


I'll discuss the treatment of high energy interactions of hadrons and nuclei, in relation to experimental studies of ultra-high energy cosmic rays (UHECRs). I'll start with the general physics approaches of present day Monte Carlo (MC) generators and describe in some more detail the QGSJET-II MC model. Further, I'll demonstrate which features of high energy interactions have a strongest impact on predicted characteristics of cosmic ray induced extensive air showers (EAS) - nuclear-electromagnetic cascades in the atmosphere. Finally, I'll address the problem of a self-consistent interpretation of experimental data of the Pierre Auger observatory and outline the respective consequences for the nuclear composition of UHECRs.​

Join the meeting here: Zoom link

Meeting ID: 921 1801 0804
Passcode: 68144845