Cosmic-ray protons, nuclei, electrons, and antiparticles under a two-halo scenario of diffusive propagation

Abstract : We report calculations of cosmic-ray proton, nuclei, antiproton, electron and positron energy spectra within a "two-halo model" of diffusive transport. The two halos represent a simple, physically consistent generalization of the standard diffusion models, which assume a unique type of diffusion for cosmic rays in the whole Galactic halo. We believe instead that cosmic rays may experience a smaller energy dependence of diffusion when they are in proximity of the Galactic disk. Our scenario is supported by recent observations of cosmic-ray protons, nuclei, anisotropy, and gamma-rays. We predict remarkably hard antiparticle spectra at high energy. In particular, at E>10 GeV, the antiproton/proton ratio is expected to flatten, while the positron fraction is found to increase with energy. We discuss the implications for cosmic-ray physics and dark matter searches via antimatter.
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Submitted on : Monday, October 5, 2015 - 8:43:21 AM
Last modification on : Tuesday, May 22, 2018 - 9:48:08 PM

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N. Tomassetti. Cosmic-ray protons, nuclei, electrons, and antiparticles under a two-halo scenario of diffusive propagation. Physical Review D, American Physical Society, 2015, 92 (8), pp.081301(R). ⟨10.1103/PhysRevD.92.081301⟩. ⟨in2p3-01211368⟩

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