UH cosmic rays and solar system material - The elements just beyond iron

Details UH cosmic rays and solar system material - The elements just beyond iron UH cosmic rays and solar system material - The elements just beyond iron

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49...47w&link_type=abstract

Astrophysics and Space Science, vol. 49, no. 1, June 1977, p. 47-81. Research supported by the Aerospace Corp.

Astronomy and Astrophysics

Astrophysics

9

Abundance, Astronomical Models, Cosmic Rays, Heavy Nuclei, Nuclear Fusion, Solar System, Stellar Models, Supernovae

Scientific paper

The nucleosynthesis of cosmic-ray elements between the iron peak and the rare-earth region is examined, and compositional changes introduced by propagation in interstellar space are calculated. Theories on the origin of elements heavier than iron are reviewed, a supernova model of explosive nucleosynthesis is adopted for the ultraheavy (UH) cosmic rays, and computational results for different source distributions are compared with experimental data. It is shown that both the cosmic-ray data and the nucleosynthesis calculations are not yet of sufficient precision to pinpoint the processes occurring in cosmic-ray source regions, that the available data do provide boundary conditions for cosmic-ray nucleosynthesis, and that these limits may apply to the origin of elements in the solar system. Specifically, it is concluded that solar-system abundances appear to be consistent with a superposition of the massive-star core-helium-burning s-process plus explosive-carbon-burning synthesis for the elements from Cu to As and are explained adequately by the s- and r-processes for heavier elements.

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