Interactions of UHE cosmic ray nuclei with radiation during acceleration: consequences on the spectrum and composition - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




Interactions of UHE cosmic ray nuclei with radiation during acceleration: consequences on the spectrum and composition - Astrophysics > High Energy Astrophysical Phenomena - Download this document for free, or read online. Document in PDF available to download.

Abstract: In this paper, we study the diffusive shock acceleration of cosmic-rayprotons and nuclei, taking into account all the relevant interaction processeswith photon backgrounds. We investigate how the competition between protons andnuclei is modified by the acceleration parameters such as the accelerationrate, its rigidity dependence, the photon density and the confinementcapability of the sources. We find that in the case of interaction-limitedacceleration processes protons are likely to be accelerated to higher energiesthan nuclei, whereas for confinement-limited acceleration nuclei areaccelerated to higher energies than protons. Finally, we discuss our results inthe context of possible astrophysical accelerators, and in the light of recentcosmic-ray data.



Author: D. Allard, R. J. Protheroe

Source: https://arxiv.org/



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