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arxiv 0910.4184 v2 pith:4HEPO4KH submitted 2009-10-21 astro-ph.HE

Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV

R.U. Abbasi , T. Abu-Zayyad , M. Al-Seady , M. Allen , J.F. Amman , R.J. Anderson , G. Archbold , K. Belov
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J.W. Belz D.R. Bergman S.A. Blake O.A. Brusova G.W. Burt C. Cannon Z. Cao W. Deng Y. Fedorova C.B. Finley R.C. Gray W.F. Hanlon C.M. Hoffman M.H. Holzscheiter G. Hughes P. Huentemeyer B.F Jones C.C.H. Jui K. Kim M.A. Kirn E.C. Loh J.P. Lundquist M.M. Maestas N. Manago L.J. Marek K. Martens J.A.J. Matthews J.N. Matthews S.A. Moore A. O'Neill C.A. Painter L. Perera K. Reil R. Riehle M. Roberts D. Rodriguez N. Sasaki S.R. Schnetzer L.M. Scott G. Sinnis J.D. Smith P. Sokolsky C. Song R.W. Springer B.T. Stokes S. Stratton S.B. Thomas J.R. Thomas G.B. Thomson D. Tupa X. Zhang A. Zech
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keywords compositioncosmicairshowerconsistentenergyhiresmodelsxmax
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We report studies of ultra-high energy cosmic ray composition via analysis of depth of airshower maximum (Xmax), for airshower 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 EeV 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 EeV.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Study of Flat Spectrum Radio Quasars and BL Lacertae Objects as Sources of Diffusive Ultra High-Energy Cosmic Rays

    astro-ph.HE 2025-11 unverdicted novelty 4.0

    BL Lacs remain consistent with UHECR observations while FSRQs are disfavoured by anisotropy and source density mismatches after propagation modeling.

  2. TeV-PeV Gamma-ray and Neutrino Emission in the Galactic Plane

    astro-ph.HE 2026-06 unverdicted novelty 3.0

    Alternative ISRF models produce only modest changes to the LHAASO diffuse gamma-ray fit; the associated pp neutrinos remain consistent with IceCube all-sky data and compatible with ANTARES/KM3NeT limits.