Carlos Hojvat

TL;DR: The Pierre Auger Collaboration reports the observation of thousands of cosmic rays with ultrahigh energies of several exa–electron volts, arriving in a slightly dipolar distribution, showing that they originate outside the Milky Way Galaxy.

TL;DR: In this article, the authors examined the implications of the distributions of the depths of atmospheric shower maximum (X-max) using a hybrid technique, for composition and hadronic interaction models, and found that their data are not well described by a mix of protons and iron nuclei over most of the energy range.

TL;DR: In this article, the authors presented the first hybrid measurement of the average muon number in air showers at ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°.

TL;DR: A new method to test hadronic interaction models without relying on the absolute energy calibration is introduced, and it is applied to events with primary energy 6-16 EeV (E_{CM}=110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory.