Issue |
EPJ Web of Conferences
Volume 99, 2015
ISVHECRI 2014 – 18th International Symposium on Very High Energy Cosmic Ray Interactions
|
|
---|---|---|
Article Number | 04004 | |
Number of page(s) | 8 | |
Section | Highlight Talks 1 | |
DOI | https://doi.org/10.1051/epjconf/20159904004 | |
Published online | 03 August 2015 |
https://doi.org/10.1051/epjconf/20159904004
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: fukushim@icrr.u-tokyo.ac.jp
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.