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

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

    Research output: Contribution to journalArticle

    Abstract

    The sharp change in slope of the ultra-high energy cosmic ray (UHECR) spectrum around 1018:6 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, photodisintegration 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 1017:5 eV. The mechanism has a clear signature in the spectrum and flavors of neutrinos.

    Original languageEnglish (US)
    Article number513
    JournalUnknown Journal
    Volume30-July-2015
    StatePublished - 2015

    Fingerprint

    Cosmic rays
    Cosmic Rays
    High Energy
    Protons
    Flavors
    Chemical analysis
    Particle accelerators
    Accelerator
    Neutrinos
    Nucleus
    Slope
    Signature
    Entire
    Range of data

    ASJC Scopus subject areas

    • General

    Cite this

    Farrar, G. R., Unger, M., & Anchordoqui, L. A. (2015). Origin of the ankle in the ultra-high energy cosmic ray spectrum and the extragalactic protons below it. Unknown Journal, 30-July-2015, [513].

    Origin of the ankle in the ultra-high energy cosmic ray spectrum and the extragalactic protons below it. / Farrar, Glennys R.; Unger, Michael; Anchordoqui, Luis A.

    In: Unknown Journal, Vol. 30-July-2015, 513, 2015.

    Research output: Contribution to journalArticle

    Farrar, Glennys R. ; Unger, Michael ; Anchordoqui, Luis A. / Origin of the ankle in the ultra-high energy cosmic ray spectrum and the extragalactic protons below it. In: Unknown Journal. 2015 ; Vol. 30-July-2015.
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