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Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array
<!--HTML-->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: e...
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Lenguaje: | eng |
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2015
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Acceso en línea: | http://cds.cern.ch/record/2010459 |
_version_ | 1780946499123806208 |
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author | Prof. FUKUSHIMA, Masaki |
author_facet | Prof. FUKUSHIMA, Masaki |
author_sort | Prof. FUKUSHIMA, Masaki |
collection | CERN |
description | <!--HTML-->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. |
id | cern-2010459 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2015 |
record_format | invenio |
spelling | cern-20104592022-11-02T22:09:42Zhttp://cds.cern.ch/record/2010459engProf. FUKUSHIMA, MasakiRecent Results on Ultra-High Energy Cosmic Rays from the Telescope ArrayAMS DAYS AT CERN - The Future of Cosmic Ray Physics and Latest ResultsConferences<!--HTML-->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.oai:cds.cern.ch:20104592015 |
spellingShingle | Conferences Prof. FUKUSHIMA, Masaki Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array |
title | Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array |
title_full | Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array |
title_fullStr | Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array |
title_full_unstemmed | Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array |
title_short | Recent Results on Ultra-High Energy Cosmic Rays from the Telescope Array |
title_sort | recent results on ultra-high energy cosmic rays from the telescope array |
topic | Conferences |
url | http://cds.cern.ch/record/2010459 |
work_keys_str_mv | AT proffukushimamasaki recentresultsonultrahighenergycosmicraysfromthetelescopearray AT proffukushimamasaki amsdaysatcernthefutureofcosmicrayphysicsandlatestresults |