Abundances of ultraheavy elements in the cosmic radiation - Results from HEAO 3

Details Abundances of ultraheavy elements in the cosmic radiation - Results from HEAO 3 Abundances of ultraheavy elements in the cosmic radiation - Results from HEAO 3

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..997b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 997-1009.

Astronomy and Astrophysics

Astrophysics

74

Cosmic Rays, Heavy Elements, Heavy Nuclei, Ionization Potentials, Nuclear Fusion, Abundance, Heao 3, Solar System

Scientific paper

An analysis is presented that, for the first time, systematically normalizes the data from the HEAO 3 heavy nuclei experiment on the cosmic-ray abundances of all the elements heavier than germanium to that of iron. In the range of atomic number Z from 33 to 60, the analysis yields abundances of odd-even element pairs. The abundances are consistent with a cosmic-ray source having a composition similar to that of the solar system, but subject to source fractionation correlated with the first ionization potential (FIP) of each element. For Z greater than 60, the analysis yields abundances of element groups. For these heaviest nuclei, we find an enhancement of the abundance of the platinum group, elements with Z of 74-80, relative to that in propagated solar system source, and a corresponding increase in the abundance of the largely secondary elements in the 62-73 range. These abundances suggest that there is an enhancement of the r-process contribution to the source nuclei in the Z greater than 60 charge region. Over the entire region of charge, standard leaky box models of propagation satisfactorily model secondary production.

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