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 language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2015|
|Event||34th International Cosmic Ray Conference, ICRC 2015 - The Hague, Netherlands|
Duration: Jul 30 2015 → Aug 6 2015
ASJC Scopus subject areas