| Talk | |||||||||||
| Title | Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array | ||||||||||
| Video |
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| Author(s) | Prof. FUKUSHIMA, Masaki (speaker) (University of Tokyo) | ||||||||||
| Corporate author(s) | CERN. Geneva | ||||||||||
| Imprint | 2015-04-17. - Streaming video. | ||||||||||
| Series | (Conferences) (AMS DAYS AT CERN - The Future of Cosmic Ray Physics and Latest Results) | ||||||||||
| Lecture note | on 2015-04-17T12:15:00 | ||||||||||
| Subject category | Conferences | ||||||||||
| Abstract | TA's recent results on Ultra-High Energy Cosmic Rays (UHECRs) are reported. The energy spectrum based on 20k events above 10^18.2 eV demonstrates a clear dip at 10^18.7 eV and a cutoff at 10^19.7 eV , the shape and the energies of which are well described by the GZK process: energy loss of extra-galactic protons by the interaction with the CMB and IR background. The primary composition obtained from the shower maximum analysis using the hybrid technique is consistent with 100% proton or light nuclei, and inconsistent with 100% iron up to 10^19.3 eV. Above the GZK cutoff energy, a large flux enhancement of medium size (radius=20deg) is observed in the direction of Ursa-Major. The chance probability of this hotspot appearing from the isotropic flux is 4.0sigma. The center of the hotspot is 19 deg off from the Super-Galactic Plane, and no obvious candidate of UHECRs is known in this direction. | ||||||||||
| Copyright/License | © 2015-2024 CERN | ||||||||||
| Submitted by | laurence.barrin@cern.ch | ||||||||||
Record created 2015-04-18, last modified 2022-11-02
Talk details