Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..111b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 111-118.
Astronomy and Astrophysics
Astronomy
12
Abundance, Heavy Elements, Lead (Metal), Platinum, Primary Cosmic Rays, Spaceborne Astronomy, Heao 3, Heavy Nuclei
Scientific paper
An observation of the abundances of cosmic-ray lead-group and platinum-group nuclei is reported, using data from the HEAO 3 Heavy Nuclei Experiment. From an analysis of 580 days of exposure, 322 nuclei were selected with reasonable charge resolution, E at least 1.3 GeV/nucleon and Z at least 50. The data show a defined abundance peak in the 'platinum' region (Z from 74 to 80), a small abundance of 'lead' (Z from 81 to 83), and a significant number of 'secondary' nuclei in the range of Z between 62 and 73. Possible explanations are offered for the deduced ratio in space of 0.25 plus or minus 0.09 for 'Pb/Pt' being distinctly lower than that predicted by any of the standard models for cosmic-ray sources and propagation effects.
Binns Robert W.
Brewster N. R.
Fixsen Dale J.
Garrard Thomas L.
Israel Martin H.
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