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The most violent astrophysical sources in the Universe emit astroparticles at high energy, beyond a few MeV (106 eV). The astroparticle group of IPNO is particularly interested in protons, nuclei, and gamma rays that end their cosmic journey in the Earth atmosphere. The origin of cosmic rays, their astrophysical sources, and the propagation of particles in the Universe are some of the questions at the heart of the multi-messenger approach of the group.

The Auger group is working since 2000 in the Pierre Auger collaboration. The group members have participated to the construction of the Pierre Auger Observatory, the largest cosmic rays detector in the world, and are still strongly committed in the data analysis. They also prepare the upgrade of the Observatory, to extend its running time beyond 2016 with improved performance for the identification of primary cosmic rays beyond EeV energies (1018 eV).


The group joined the Cherenkov Telescope Array (CTA) collaboration in 2016. The two CTA sites in the Northern and Southern hemispheres will comprise the most sensitive detectors of GeV (109 eV) and TeV (1012 eV) gamma rays. The group particularly works on the cameras of the middle-size telescopes, as well as on the scientific prospective of the arrays beyond 2020.


Finally, the group participates in the building of and in the data analysis for the Large High Altitude Air Shower Observatory (LHAASO). LHAASO will combine a high sensitivity to TeV gamma rays with a detailed study of cosmic rays around the knee (PeV, 1015 eV).



Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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