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 …

Cosmic rays with energies above 1 PeV are studied using large (1 km2 to 1000 km2),
sparse arrays of detectors on the ground that observe the air showers that are produced in …

Here we consider the results of direct measurements of muons in extensive air showers with
zenith angles and energy above eV, obtained at the Pierre Auger Observatory and Yakutsk …

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 …

(1) Pions produced in the development of extended atmospheric cosmic ray air showers
subsequently decay to muons. The measured yield of those muons is generally …

In this letter, the Grey-Disk and the Core-Corona models are combined in a scenario that
aims to explain different unexpected features observed in the interactions of the highest …

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

Abstract The Pierre Auger Observatory is the largest extensive air shower detector. Based
on a hybrid system, this experiment measures the longitudinal shower development and the …

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 …

The scientific achievements of the Pierre Auger Collaboration cover diverse and
complementary fields of research. The search for the origin of ultra-high energy cosmic rays …