We present a measurement of the cosmic-ray spectrum above 100 PeV using the part of the
surface detector of the Pierre Auger Observatory that has a spacing of 750 m. An inflection of …

We present the first measurement of the fluctuations in the number of muons in extensive air
showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations …

Many questions remain open concerning the origin of high-and ultra-high-energy cosmic
rays. Due to their low flux, cosmic rays with energy above 1015 eV can only be indirectly …

The Pierre Auger Observatory [1] is located in the North of the city of Malargüe, province of
Mendoza, Argentina and covers an area of about 3000km2. It is designed to detect ultra …

Tools to accurately simulate extensive air showers are a key asset for the understanding of
ultra-high energy cosmic rays. In this thesis, the Monte Carlo air shower simulation …

The underground muon detector of the Pierre Auger Observatory is aimed at attaining direct
measurements of the muonic component of extensive air showers produced by cosmic rays …

The Pierre Auger Observatory [1] was originally designed to study ultra-high-energy cosmic
rays (UHECR) with primary particle energy above 3× 1018 eV. It is located in the Southern …

In this paper a new semi-analytical model is used to describe the evolution of air showers in
the atmosphere. The model is based on the interpretation of the shower as a branching …

Kurzfassung Ultrahochenergetische kosmische Strahlung (UHECRs) besteht aus den
energiereichsten Teilchen, die in der Natur vorkommen. Die Suche nach ihrem Ursprung …

The Pierre Auger Observatory is the world's largest detector of ultra-high energy cosmic rays
(UHECRs). It uses an array of fluorescence telescopes and particle detectors at the ground …