data versus simulations

We analyse a sample of 33 extensive air showers (EAS) with estimated primary energies above 2·10 19 eV and high-quality muon data recorded by the Yakutsk EAS array. We compare, event-by-event, the observed muon density to that expected from COR-SIKA simulations for primary protons and iron, using SI...

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Bibliographic Details
Main Authors: A. V. Glushkov, I. T. Makarov, M. I. Pravdin, I. E. Sleptsov, D. S. Gorbunov, G. I. Rubtsov, S. V. Troitsky
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published:
Subjects:
Yakutsk
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.248.3476
http://arxiv.org/pdf/0710.5508v2.pdf
Description
Summary:We analyse a sample of 33 extensive air showers (EAS) with estimated primary energies above 2·10 19 eV and high-quality muon data recorded by the Yakutsk EAS array. We compare, event-by-event, the observed muon density to that expected from COR-SIKA simulations for primary protons and iron, using SIBYLL and EPOS hadronic interaction models. The study suggests the presence of two distinct hadronic components, “light ” and “heavy”. Simulations with EPOS are in a good agreement with the expected composition in which the light component corresponds to protons and the heavy component to iron-like nuclei. With SYBILL, simulated muon densities for iron primaries are a factor of ∼ 1.5 less than those observed for the heavy component, for the same electromagnetic signal. Assuming two-component proton-iron composition and the EPOS model, the fraction of protons with energies E> 10 19 eV is 0.52 +0.19 −0.20 at 95 % confidence level. Number of muons in extensive air showers (EAS) is used as an estimator of the primary

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