Above 5 EeV, cosmic rays are extragalactic atomic nuclei whose average mass rises with energy, with arrival directions clustering toward nearby galaxies, but their sources are still unknown.
Astroparticle and particle physics at ultra-high energy: results from the Pierre Auger Observatory
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abstract
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 (UHECRs) is based on the measurement of the energy spectrum and mass composition of the primaries, on studies of multi-messengers, and on extensive anisotropy searches. With the collected data it is also possible to explore the characteristics of hadronic interactions at energies unreachable at human-made accelerators, and to assess the existence of non-standard physics effects. A selection of the latest results is presented and the emerging picture is discussed.
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What do we know about cosmic rays with energies above 5 EeV?
Above 5 EeV, cosmic rays are extragalactic atomic nuclei whose average mass rises with energy, with arrival directions clustering toward nearby galaxies, but their sources are still unknown.