EPJ Web of Conferences
Volume 99, 2015ISVHECRI 2014 – 18th International Symposium on Very High Energy Cosmic Ray Interactions
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|03 August 2015
Recent results from telescope array
Institute for Cosmic Ray Research, The University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8582, Japan
a e-mail: email@example.com
Published online: 3 August 2015
The Telescope Array (TA) is an experiment to observe Ultra-High Energy Cosmic Rays (UHECRs). TA's recent results, the energy spectrum and anisotropy based on the 6-year surface array data, and the primary composition obtained from the shower maximum (XMAX) are reported. The spectrum demonstrates a clear dip and cutoff. The shape of the spectrum is well described by the energy loss of extra-galactic protons interacting with the cosmic microwave background (CMB). Above the cutoff, a medium-scale (20∘ radius) flux enhancement was observed near the Ursa-Major. A chance probability of creating this hotspot from the isotropic flux is 4.0 σ. The measured ⟨XMAX⟩ is consistent with the primary being proton or light nuclei for energies 1018.2 eV–1019.2 eV.
© Owned by the authors, published by EDP Sciences, 2015
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