An astrophysical interpretation of the GCR heavy nuclei Enhancement at high energies

Details An astrophysical interpretation of the GCR heavy nuclei Enhancement at high energies An astrophysical interpretation of the GCR heavy nuclei Enhancement at high energies

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..275m&link_type=abstract

SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,

Physics

Scientific paper

A substantial increase of the mean logarithmic mass (ln A) of galactic cosmic rays vs energy has been observed . We study three effects that could explain this trend i) different source spectra for protons and heavy nuclei ii) a selective nuclear destruction in flight of heavies iii) a gradient of the source number and chemical composition in the galactic disk. Pure geometrical effects are less determining than the diffusion coefficient spectral index and a difference in source spectra. Subsequently, we conclude that the physics of cosmic ray confinement is the essential cause of the heavy nuclei enrichment until 10**{15} eV.

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