TY - JOUR
T1 - Origin of the ankle in the ultra-high energy cosmic ray spectrum and the extragalactic protons below it
AU - Farrar, Glennys R.
AU - Unger, Michael
AU - Anchordoqui, Luis A.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
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M3 - Conference article
AN - SCOPUS:84988697489
SN - 1824-8039
VL - 30-July-2015
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 513
T2 - 34th International Cosmic Ray Conference, ICRC 2015
Y2 - 30 July 2015 through 6 August 2015
ER -