Measurements of the depth of maximum of air-shower profiles at the Pierre Auger Observatory and their composition implications

0551364 - FZÚ 2022 RIV JP eng C - Konferenční příspěvek (zahraniční konf.)
de Souza, V.
Measurements of the depth of maximum of air-shower profiles at the Pierre Auger Observatory and their composition implications.
JPS Conference Proceedings. Vol. 9. Tokyo: Physical Society of Japan, 2016 - (Fukushima, M.; Matthews, J.), s. 1-8, č. článku 010015. ISBN 978-4-89027-113-9. ISSN 2435-3892.
[International Symposium for Ultra-High Energy Cosmic Rays (UHECR2014). Springdale, Utah (US), 12.10.2014-15.10.2014]
Výzkumná infrastruktura: AUGER-CZ - 90038
Klíčová slova: Pierre Auger Observatory * Xmax * composition
Obor OECD: Particles and field physics
https://journals.jps.jp/doi/pdf/10.7566/JPSCP.9.010015

We describe how the analysis of air showers detected by the Pierre Auger Observatory leads to an accurate determination of the depth of maximum (Xmax). First, the analysis of the air-shower which leads to the reconstruction of Xmax is discussed. The properties of the detector and its measurement biases are treated and carefully taken into consideration. The Xmax results are interpreted in terms of composition, where the interpretation depends mainly on the hadronic interaction models. A global fit of the Xmax distribution yields an estimate of the abundance of four primaries species. The analysis represents the most statistically significant composition information ever obtained for energies above 1017.8 eV. The scenario that emerges shows no support for a strong flux of iron nuclei and a strong energy dependence of the proton fraction.

Trvalý link: http://hdl.handle.net/11104/0326782