Propagation model for cosmic ray species in the Galaxy

Abstract

In a recent paper (Moskalenko et al., 2002), it has been shown that the flux of secondary cosmic ray (CR) antiprotons appears to be contradictory to measurements of secondary to primary nuclei ratios in cosmic rays when calculated in the same Galactic propagation model. The contradiction appears as a value of the diffusion coefficient necessary to match the secondary ratios antiproton/proton and B/C. In particlular, it was shown that the reacceleration models designed to match secondary to primary nuclei ratios produce too few antiprotons. It is, however, clear that some reacceleration is unavoidable in the turbulent interstellar medium. Here we discuss an idea of how to improve reacceleration model by allowing for the damping of interstellar turbulences on the small scale by cosmic rays, mostly protons. This would lead to increase in the mean free path lenghts at low energies, the well-known phenomena empirically discovered in the Leaky Box models, thus producing less secondary nuclei. Antiprotons will remain almost non-affected due to their high energy threshold of production cross section.

6 pages, no figures, cospar.sty; Proc. of 34th COSPAR Scientific Assembly (Houston, 10-19 October 2002). Submitted to Advances in Space Research. More details can be found at http://www.gamma.mpe-garching.mpg.de/~aws/aws.html

References in corpus (7)

• Secondary antiprotons and propagation of cosmic rays in the Galaxy and heliosphere
• Dissipation of Magnetohydrodynamic Waves on Energetic Particles: Impact on Interstellar Turbulence and Cosmic Ray Transport
• Measurements of Cosmic-ray Low-energy Antiproton and Proton Spectra in a Transient Period of the Solar Field Reversal
• Models for Galactic cosmic-ray propagation
• Challenging cosmic ray propagation with antiprotons. Evidence for a "fresh" nuclei component?
• Propagation of secondary antiprotons and cosmic rays in the Galaxy
• Secondary Antiprotons in Cosmic Rays

Cited by in corpus (6)

• GALPROP WebRun: an internet-based service for calculating galactic cosmic ray propagation and associated photon emissions
• Cosmic ray physics in calculations of cosmological structure formation
• Cosmic-ray transport from AMS-02 B/C data: benchmark models and interpretation
• Cosmic ray production in superbubbles
• CEM03 and LAQGSM03 - new modeling tools for nuclear applications
• On the viability of holistic cosmic-ray source models