Comparison of distributed reacceleration and leaky-box models of cosmic-ray abundances (Z = 3-28)

Astronomy and Astrophysics – Astrophysics

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Cosmic Rays, Interstellar Matter, Radiation Distribution, Radiation Transport, Abundance, Astronomical Models, Milky Way Galaxy, Shock Wave Interaction, Shock Waves, Supernova Remnants

Scientific paper

A large collection of elemental and isotopic cosmic-ray data has been analyzed using the leaky-box transport model with and without reacceleration in the interstellar medium. Abundances of isotopes and elements with charges Z = 3-28 and energies E = 10 MeV/nucleon-1 TeV/nucleon were explored. Our results demonstrate that reacceleration models make detailed and accurate predictions with the same number of parameters or fewer as standard leaky-box models. Ad hoc fitting parameters in the standard model are replaced by astrophysically significant reacceleration parameters. Distributed reacceleration models explain the peak in secondary-to-primary ratios around 1 GeV/nucleon. They diminish the discrepancy between rigidity-dependent leakage and energy-independent anisotropy. They also offer the possibility of understanding isotopic anomalies at low energy.

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