Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998newar..42..277w&link_type=abstract
New Astronomy Reviews, Volume 42, Issue 3-4, p. 277-286.
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A survey of the present state of attempts to deduce the abundances of nuclei at the sources of the cosmic radiation from the abundances measured near the earth. Particular attention is directed towards the effects that are introduced by the energy-dependent cross-sections for the production of fragments due to interactions in the interstellar medium. It is pointed out that the energy history of the cosmic ray nuclei is quite uncertain, due to the uncertain nature of the interstellar medium, possible effects of re-acceleration during propagation and the spread in energies introduced by solar modulation. These factors limit the precision with which source abundances can be deduced no matter how accurately the local abundances are measured, unless these abundances are measured at energies at which the cross-sections do not vary with energy.
Waddington Jake C.
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