Implications of the penetration depth of ultrahigh-energy cosmic rays on physics at 100 TeV.

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ID: 93940
2013
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Abstract
The simple interpretation of Pierre Auger Observatory ultrahigh energy cosmic rays (UHECRs) penetration depth measurements suggests a transition at the energy range 1.1-35×10(18)  eV from protons to heavier nuclei. A detailed comparison of this data with air shower simulations reveals strong restrictions on the amount of light nuclei (protons and He) in the observed flux. We find a robust upper bound on the observed proton fraction of the UHECR flux and we rule out a composition dominated by protons and He. Acceleration and propagation effects lead to an observed composition that is different from the one at the source. Using a simple toy model that takes into account these effects, we show that the observations require an extreme metallicity at the sources with metals to protons mass ratio of 1:1, a ratio that is larger by a factor of a hundred than the solar abundance. This composition imposes an almost impossible constraint on all current astrophysical models for UHECR accelerators. This m4ay provide a first hint toward new physics that emerges at ∼100  TeV and leads to a larger proton cross section at these energies.
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shaham2013implicationsphysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shaham, Nimrod;Piran, Tsvi;
Journal physical review letters
Year 2013
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