Positron fraction in cosmic rays and models of cosmic-ray propagation

Details Positron fraction in cosmic rays and models of cosmic-ray propagation Positron fraction in cosmic rays and models of cosmic-ray propagation

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvd..82b3009c&link_type=abstract

Physical Review D, vol. 82, Issue 2, id. 023009

Other

4

Cosmic Rays, Composition, Energy Spectra And Interactions, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays

Scientific paper

The positron fraction observed by PAMELA and other experiments up to ˜100GeV is analyzed in terms of models of cosmic-ray propagation. It is shown that generically we expect the positron fraction to reach ˜0.6 at energies of several TeV, and its energy dependence bears an intimate but subtle connection with that of the boron to carbon ratio in cosmic rays. The observed positron fraction can be fit in a model that assumes a significant fraction of the boron below ˜10GeV is generated through spallation of cosmic-ray nuclei in a cocoonlike region surrounding the sources, and the positrons of energy higher than a few GeV are almost exclusively generated through cosmic-ray interactions in the general interstellar medium. Such a model is consistent with the bounds on cosmic-ray anisotropies and other observations.

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