The diffusion of cosmic rays in the Galaxy-A Monte Carlo approach

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Cosmic Rays, Cosmic Ray Nucleosynthesis

Scientific paper

We have used a Monte Carlo diffusion model to describe the propagation of cosmic ray particles in the Galaxy. This model uses realistic dependencies for the matter density, the size of the galactic halo, the diffusion coefficient, etc., to describe this motion. The results are similar in many respects to those of Leaky Box models, but interesting differences, subject to measurement by ACE and other high precision instruments are evident. In this paper we focus on these differences as they relate to: 1) The effect of the matter density on the spectra of nuclei from ~1-100 GeV and how it influences the determination of the primary spectra of these nuclei; 2) The effect of the matter density and the halo size on the 3He/4He, B/C and sub Fe/Fe ratios; 3) The effect of all of these propagation parameters on the surviving fraction of the radioactive clock isotopes including 14C and also on the K-capture isotopes. .

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