Air Shower Development and Hadron Production at Very Forward Region

Abstract

Whereas muon in extensive air shower is an observable sensitive to the primary composition and to the hadron interaction properties, the discrepancy between measured and estimated values has not been solved. Using the new data of forward hadron from an accelerator experiment, a hadron interaction model (QGSJET II-04) is modified. Air shower simulation with the modified interaction model produces more muons. The increased muons concentrate around the shower core and the number density of secondary particle far from core does not change much.