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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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Autor principal: Prof. FUKUSHIMA, Masaki
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:http://cds.cern.ch/record/2010459
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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
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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