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- W2161657246 abstract "We consider the acceleration of charged particles at the ultrarelativistic shocks, with Lorentz factors Γs≫1 relative to the upstream medium, arising in relativistic fireball models of gamma-ray bursts (GRBs). We show that for Fermi-type shock acceleration, particles initially isotropic in the upstream medium can gain a factor of order Γs2 in energy in the first shock-crossing cycle, but that the energy gain factor for subsequent shock-crossing cycles is only of order 2, because for realistic deflection processes particles do not have time to become isotropic upstream before recrossing the shock.We evaluate the maximum energy attainable and the efficiency of this process, and show that for a GRB fireball expanding into a typical interstellar medium, these exclude the production of ultra-high-energy cosmic rays (UHECRs), with energies in the range 1018.5--1020.5 eV, by the blast wave. However, we propose that in the context of neutron-star binaries as the progenitors of GRBs, relativistic ions from the pulsar-wind bubbles produced by these systems could be accelerated by the blast wave. We show that if the known binary pulsars are typical, the maximum energy, efficiency, and spectrum in this case can account for the observed population of UHECRs." @default.
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- W2161657246 date "1999-05-01" @default.
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- W2161657246 title "Ultra-high-energy cosmic ray acceleration by relativistic blast waves" @default.
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- W2161657246 doi "https://doi.org/10.1046/j.1365-8711.1999.02566.x" @default.
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