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We report calculations of cosmic-ray proton, nuclei, antiproton, electron andpositron energy spectra within a "two-halo model" of diffusive transport. Thetwo halos represent a simple, physically consistent generalization of thestandard diffusion models, which assume a unique type of diffusion for cosmicrays in the whole Galactic halo. We believe instead that cosmic rays mayexperience a smaller energy dependence of diffusion when they are in proximityof the Galactic disk. Our scenario is supported by recent observations ofcosmic-ray protons, nuclei, anisotropy, and gamma-rays. We predict remarkablyhard antiparticle spectra at high energy. In particular, at E>10 GeV, theantiproton/proton ratio is expected to flatten, while the positron fraction isfound to increase with energy. We discuss the implications for cosmic-rayphysics and dark matter searches via antimatter.

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