# Tien Shan data on inelastic proton-air cross section at 10 PeV

## TL;DR

This paper presents new measurements of the inelastic proton-air cross section at 10 PeV, showing a gradual increase with energy that aligns with the QGSJET-II-04 model, based on extensive air shower data from Tien Shan.

## Contribution

It provides the first absolute measurement of the inelastic proton-air cross section at 10 PeV and compares it with various models, confirming the energy-dependent growth.

## Key findings

- Cross section increases by 7-9% per energy decade from 0.2 TeV to 10 PeV.
- Measured cross section is around 350 mb at 1 PeV and 380 mb at 10 PeV.
- Data aligns better with the QGSJET-II-04 model.

## Abstract

New data on the absolute value on the inelastic proton-air cross section at 10 PeV are presented. Conclusion is made about the growth with energy of the inelastic proton-air cross section according to comparisons with experimental data were obtained at the Tien Shan complex array on various components of extensive air showers: hadrons, Cherenkov light and electrons with many different calculated models of cosmic rays interactions at the atmosphere. The analysis showed that the rise conforms to 7-9 % per one order of the energy from 0.2 TeV (accelerators with fixed targets) to 10 PeV (EAS cosmic rays). That corresponds to around 350 mb at 1 PeV and 380 mb at 10 PeV of primary cosmic rays. These data corresponds better to the QGSJET-II-04 model version.

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Source: https://tomesphere.com/paper/1802.07357