Dušan Mandát visited SWGO observatory candidate site in Peru

Dr. Dušan Mandát from the Joint Laboratory of Optics visited in the past days together with his colleagues from FZU Dr. J. Vícha and Ing. A. Bakalová Arequipa in Peru, the candidate site for building of the future Southern Wide-field Gamma-ray Observatory (SWGO).

New Feature Found in UHECR Energy Spectrum

The energy spectrum of the highest-energy particles in the Universe, ultra-high energy cosmic rays, has been measured with the Pierre Auger Observatory with an unprecedented precision. In addition to the well-known kink in the energy spectrum, typically referred to as the ankle, a new spectral break is found at somewhat higher energy. This new break in the energy spectrum can be explained by an energy-dependent mass composition of cosmic rays. The results are published in two related papers (Phys. Rev. Lett. 125, 121106 (2020) and Phys. Rev. D 102, 062005 (2020)).