Physics – Nuclear Physics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.277..319s&link_type=abstract
(Royal Society, Discussion on the Origin of the Cosmic Radiation, London, England, Feb. 20, 21, 1974.) Royal Society (London), P
Physics
Nuclear Physics
26
Abundance, Cosmic Rays, Energy Spectra, Galactic Radiation, Nuclei (Nuclear Physics), Chemical Composition, Heavy Nuclei, Milky Way Galaxy, Particle Diffusion, Particle Energy, Solar System
Scientific paper
Of the nuclear cosmic rays arriving in the vicinity of earth from interstellar space, more than 90% have energies less than 10 GeV/u. Some effects of their modulation (including deceleration) in the solar system are briefly discussed. The origin of particles at energies below 10 MeV/u is still obscure. They could be due to stellar explosions or to solar emission, or perhaps to interaction of interstellar gas with the solar wind. Between .1 and 10 GeV/u, the composition appears constant to ca. 30% within the statistics of available data. Cosmic rays traverse a mean path length of 6 g/sq cm in a medium assumed to contain nine hydrogen atoms for each helium atom. Spallation reactions occurring in this medium result in enhancement of many cosmic-ray elements that are more scarce in the general abundances by several orders of magnitude. Cosmic-ray dwell time in the Galaxy seems to be less than 10 m.y. The source composition of cosmic rays has been derived for elements with atomic numbers from 1 to 26.
Shapiro Marjorie
Silberberg Rein
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