Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV

Details Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV

2009-10-21

arxiv.org/abs/0910.4184v2

Phys.Rev.Lett.104:161101,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages, 4 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.104.161101

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/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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