Computer Science
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15q..59s&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 6, p. (6)59-(6)63
Computer Science
3
Composition (Property), Cosmic Rays, Heavy Nuclei, Interstellar Matter, Radiation Sources, Supergiant Stars, Supernovae, Abundance, Chemical Analysis, Chemical Composition, Condensation Nuclei, Ionization Potentials
Scientific paper
A possible mechanism for the formation of the source composition of ultra-heavy nuclei in cosmic rays is considered by taking into account the observed results of this composition. This composition seems to indicate the ultra-heavy elements, together with siderophile ones, must have been relatively more efficiently condensed into source matter of cosmic rays in comparison with volatile elements. Since the condensation temperature of each of these elements is higher than 1000 K, this composition seems to have been produced by means of fractionation due to the condensation process of the elements somewhere in the expanding clouds ejected from the type II supernova explosions or red supergiant stars, because the ultra-heavy nuclei as observed in the source composition must have been synthesized mainly in the r-process taking place in these clouds.
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