Direct measurement of the muonic content of extensive air showers between 2 × 10^17 and 2 × 10^18 eV at the Pierre Auger Observatory
The hybrid design of the Pierre Auger Observa tory allows for the measurement of the properties of exten sive air showers initiated by ultra-high energy cosmic rays with unprecedented precision. By using an array of proto type underground muon detectors, we have performed the first direct measurem...
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| Autores principales: | , , , , , , |
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| Formato: | article artículo publishedVersion |
| Lenguaje: | Inglés |
| Publicado: |
Springer
2021
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/2133/20516 http://hdl.handle.net/2133/20516 |
| Aporte de: |
| Sumario: | The hybrid design of the Pierre Auger Observa tory allows for the measurement of the properties of exten sive air showers initiated by ultra-high energy cosmic rays
with unprecedented precision. By using an array of proto type underground muon detectors, we have performed the
first direct measurement, by the Auger Collaboration, of the
muon content of air showers between 2 × 10^17 and 2 × 10^18
eV. We have studied the energy evolution of the attenuation corrected muon density, and compared it to predictions from
air shower simulations. The observed densities are found to
be larger than those predicted by models. We quantify this
discrepancy by combining the measurements from the muon
detector with those from the Auger fluorescence detector at
1017.5 eV and 1018 eV. We find that, for the models to explain
the data, an increase in the muon density of 38% ±4%(12%)
±21%
18% for EPOS- LHC, and of 50%(53%) ±4%(13%) ±23%
20%
for QGSJetII- 04, is respectively needed. |
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