# Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array

- Institution: CERN
- Department: Conferences
- Speaker: Masaki Prof. FUKUSHIMA
- Year: 2015
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3006152)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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..

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## Lectures

1. [Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array](https://invisiblenetwork.ai/learn/cern/3006152/299fd3f1e0d1), 40 min (CERN's player)