Origin of the ankle in the ultra-high energy cosmic ray spectrum and of the extragalactic protons below it

Glennys R. Farrar; Luis A. Anchordoqui; Michael Unger

Origin of the ankle in the ultra-high energy cosmic ray spectrum and of the extragalactic protons below it

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arxiv 1512.00484 v1 pith:2LZZ6MHD submitted 2015-12-01 astro-ph.HE

Origin of the ankle in the ultra-high energy cosmic ray spectrum and of the extragalactic protons below it

Glennys R. Farrar , Michael Unger , Luis A. Anchordoqui This is my paper

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keywords spectrumankleenergyextragalacticultra-highabovebelowcomponent

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The sharp change in slope of the ultra-high energy cosmic ray (UHECR) spectrum around 10^{18.6} eV (the ankle), combined with evidence of a light but extragalactic component near and below the ankle which evolves to intermediate composition above, has proved exceedingly challenging to understand theoretically. We show that for a range of source conditions, photo-disintegration of ultra-high energy nuclei in the region surrounding a UHECR accelerator naturally accounts for the observed spectrum and composition of the entire extragalactic component, which dominates above about 10^{17.5} eV. The mechanism has a clear signature in the spectrum and flavors of neutrinos.

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