Construction of CTA Telescopes in Ondřejov

On October 19, 2021, an informal meeting of MEYS CR representatives lead by dr. Marek Vyšinka (research and development section of MEYS) with investigators of infrastrutural projects EU.ARC (ALMA), EST-CZ, and CTA-CZ took place at the observatory in Ondřejov.

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)).

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