Cosmic-ray protons, nuclei, electrons, and antiparticles under a two-halo scenario of diffusive propagation
- 16 October 2015
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 92 (8), 081301
- https://doi.org/10.1103/physrevd.92.081301
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 , 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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Funding Information
- Agence Nationale de la Recherche
- Centre National de la Recherche Scientifique
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