Study Of Hadronic Interaction In The Forward Region And P-air Inelastic Cross Section

So far, the direct observation of high energy cosmic rays by satellite can only reach10¹⁴eV, it's difficult to reach 10¹⁵eV in the near future. The study of the composition of cosmic rays at the 'knee' has to rely on the indirect observation of air showers (ASs) produced by primary particles. In the data analyzing, a Monte Carlo simulation is needed, heretofore, no matter which model is adopted, the disagreement is obvious in the conclusion of the composition of knee. In many knee composition studies of recent years, significant discrepancies exist among different measurements, presenting a necessity of an improved interaction modeling.According to the description and simulation of ASs in Monte Carlo code, the growth of ASs are mainly influenced by the hadronic particles production in the forward region and the p-air inelastic cross section. The particle production in the forward region belongs to the soft interactions for that pQCD cannot be applied, so far only some phenomenological models are used for their description, so, examination or amelioration of hadronic interaction models should be mainly based on these two points.The ascertainment of parameter in the phenomenological models depends on accelerator experiment. But up to the present, the warranty gotten from accelerator experiment is deficient. The status of accelerator experiment is: the warranty of constituting models is plenitudinous in the energy region under 2TeV; but at the energy region of hyper-10TeV, because of the lack of information in the forward region, the warranty is more and more inadequate. So, examination of hadronic interaction models should be carried out at the forward region and choose the energy region from 10TeV.For these purposes we suggest to set up a big hadron calorimeter in the central part of the Yangbajing ARGO array to record the directly arrived protons and to record those AS core events that are produced at low heights. In order to see how the physics goals can be reached, run Monte Carlo simulation with CORSIKA- QGSJET model to simulate ASs, and then, drop all of the Monte Carlo events to the...