The Pierre Auger Observatory is the world's largest operating detection system for the
observation of ultra high energy cosmic rays (UHECRs), with energies above 10 17 eV. The …

Abstract The Pierre Auger Observatory has been detecting ultra-high energy cosmic rays
(UHECRs) for more than fifteen years. An essential feature of the Observatory is its hybrid …

Abstract The Pierre Auger Observatory has collected data for more than 15 years,
accumulating the world's largest exposure to ultrahigh energy cosmic rays (UHECRs). The …

The Pierre Auger Observatory has collected data for more than 15 years, accumulating the
world's largest exposure to ultrahigh energy cosmic rays (UHECRs). The energy spectrum of …

Over a century after their discovery, the measurement of the energy spectrum of ultra-high
energy cosmic rays (UHECRs) remains as one of the main issues within the field, being …

The nature of ultra-high energy cosmic rays (UHECRs) above 1017 eV is still unknown,
even if data collected in the last decade have partially answered these puzzling questions …

In this paper, ultra-high-energy cosmic rays (UHECRs) are studied with giant ground-based
detector systems recording extensive air showers, induced by cosmic ray particles in the …

The question of the origin and nature of cosmic ray particles with energies exceeding the
predicted GZK spectral cutoff is one of the present great challenges of astroparticle physics …

Cosmic rays are observed up to the astounding energies of more than 1020 eV, making
them the most energetic particles known in the universe. However, the origin of these …

The Pierre Auger Observatory is presently being upgraded to enlarge its detection
capabilities for ultra-high-energy cosmic rays. Part of this upgrade is a radio detector array …