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SUMMARY:The ultra-high energy cosmic ray spectrum  and Fermi shock acceler
 ation.
DTSTART;VALUE=DATE-TIME:20070704T194500Z
DTEND;VALUE=DATE-TIME:20070704T194500Z
DTSTAMP;VALUE=DATE-TIME:20260413T143554Z
UID:indico-contribution-121@cern.ch
DESCRIPTION:Speakers: Dr. SEMIKOZ\, Dmitri (APC\, Paris)\, Prof. KACHELRIE
 SS\, Michael (Norwegian U. Sci. Tech.)\nThe energy spectrum of ultra-high 
 energy cosmic rays (UHECR) is\n usually calculated for sources with identi
 cal properties. Assuming\n that all sources can accelerate UHECR protons t
 o the same extremely\n high maximal energy E_max > 10^{20} eV and have the
  steeply falling\n injection spectrum 1/E^{2.7}\, one can reproduce the me
 asured cosmic\n ray flux above E > 10^{18} eV. We show that relaxing the a
 ssumption of\n identical sources and using a power-law distribution of the
 ir maximal\n energy allows one to explain the observed UHECR spectrum with
  the\n injection 1/E^2 predicted by Fermi shock acceleration. We study\n p
 ossible ways to distinguish between these two cases with future\n experime
 nts.\n\nhttps://indico.nucleares.unam.mx/event/4/session/8/contribution/12
 1
LOCATION:Merida\, Mexico Regency (Hyatt)
URL:https://indico.nucleares.unam.mx/event/4/session/8/contribution/121
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