Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..833s&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 6, Dec. 1977, p. 833-838.
Astronomy and Astrophysics
Astrophysics
7
Cosmic Rays, Electromagnetic Radiation, Galactic Radiation, Interstellar Matter, Milky Way Galaxy, Distribution Functions, Heavy Nuclei, Interstellar Magnetic Fields, Monte Carlo Method, Nuclear Particles, Particle Collisions, Particle Trajectories
Scientific paper
In dealing with the propagation of cosmic-ray particles in the galaxy, nuclear collisions with interstellar matter have to be considered. They lead to a loss of the primary-source nuclei and the production of secondary spallation products. A Monte Carlo propagation program was developed to follow the individual particles through space by varying the boundary conditions between a confinement region around the higher-density source and interstellar space. Assuming an exponential path-length distribution in both regions, this two-zone model leads to a general enhancement of heavy primary-source nuclei in order to explain the measured abundance of cosmic-ray nuclei. With an energy-dependent dwelling time in the source confinement region and an energy-independent leakage from the Galaxy, this model offers an explanation for the observed energy-dependent abundance of different cosmic-ray nuclei.
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