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Title:Indications of Proton-Dominated Cosmic-Ray Composition above 1.6 EeV
Authors:Abbasi, R.U. (Author)
Lundquist, J. P. (Author)
et al.
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:We report studies of ultrahigh-energy cosmic-ray composition via analysis of depth of air shower maximum (Xmax), for air shower events collected by the High-Resolution Fly’s Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d⟨Xmax⟩/d[log(E)] of 47.9 ± 6.0 (stat) ± 3.2 (syst) g/cm^2/decade for energies between 1.6 and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum ankle at 4×10^18 eV.
Keywords:Cosmic rays, Energy spectrum, Telescope Array, Hybrid, Ultra high energy
Year of publishing:2010
Number of pages:5
Numbering:104, 19
COBISS_ID:12843779 Link is opened in a new window
URN:URN:SI:UNG:REP:CT0VGQVP
DOI:10.1103/PhysRevLett.104.161101 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Record is a part of a journal

Title:Physical Review Letters
Year of publishing:2010

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