Direct measurement of the muonic content of extensive air showers between 2 × 10 17 and 2 × 10 18 eV at the Pierre Auger Observatory.
AAB, A.; ARBELETCHE, Luan Bonneau; CATALANI, Fernando; SOUZA, Vitor de; LANG, Rodrigo Guedes; MARTÍNEZ-HUERTA, Humberto; ARMAND, Johnnier Pérez; CARVALHO JUNIOR, Washington Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.
AAB, A.; ARBELETCHE, Luan Bonneau; CATALANI, Fernando; SOUZA, Vitor de; LANG, Rodrigo Guedes; MARTÍNEZ-HUERTA, Humberto; ARMAND, Johnnier Pérez; CARVALHO JUNIOR, Washington Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.
Abstract: The hybrid design of the Pierre Auger Observatory allows for the measurement of the properties of extensive air showers initiated by ultra-high energy cosmic rays with unprecedented precision. By using an array of prototype 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 attenuationcorrected 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 10 17.5 eV and 10 18 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.
@article={003003659,author = {AAB, A.; ARBELETCHE, Luan Bonneau; CATALANI, Fernando; SOUZA, Vitor de; LANG, Rodrigo Guedes; MARTÍNEZ-HUERTA, Humberto; ARMAND, Johnnier Pérez; CARVALHO JUNIOR, Washington Rodrigues de; SANTOS, Edivaldo Moura; PEIXOTO, Carlos Jose Todero.},title={Direct measurement of the muonic content of extensive air showers between 2 × 10 17 and 2 × 10 18 eV at the Pierre Auger Observatory},journal={European Physical Journal C},note={v. 80, n. 8, p. 751-1-751-19},year={2020}}