Physics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jpha...11..209g&link_type=abstract
Journal of Physics A - Mathematical and General, vol. 11, Jan. 1978, p. 209-219.
Physics
3
Cosmic Rays, Particle Diffusion, Particle Energy, Particle Motion, Positrons, Energy Spectra, Milky Way Galaxy, Particle Flux Density, Particle Production
Scientific paper
A recent paper drew attention to the likelihood of the intensity of cosmic-ray positrons being lower than expected on the basis of the simple 'leaky box' model of particle containment. Several possible explanations arise. Analysis of an essentially one-dimensional propagation, such as would arise from transport preferentially along spiral arms, shows that if a cosmic ray gradient exists, parameters can be chosen which give the measured variation of mean path length for nuclei against energy in a natural way. This variation, near constancy below about 3 GeV/nucleon and a falling value above, follows from a diffusion coefficient and escape lifetime which are power laws of energy over the whole energy range. It is pointed out that in order to explain data on cosmic-ray positrons, it is necessary to assume that the local cosmic rays are collected from a volume comparable with the size of the Galaxy. A specific model is proposed which is in agreement with existing experimental data on cosmic rays in the energy interval considered: 1-100 GeV.
Giler M.
Wdowczyk Jerzy
Wolfendale Arnold W.
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