Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...457..435w&link_type=abstract
Astrophysical Journal v.457, p.435
Astronomy and Astrophysics
Astronomy
41
Ism: Cosmic Rays, Ism: Abundances, Sun: Abundances
Scientific paper
We have now analyzed 17 yr of Voyager 1 and Voyager 2 data and derived isotopic composition ratios for C, N, and 0 elements in cosmic rays with a statistical accuracy exceeding that of the sum of all previously published spacecraft measurements. We have also used newly measured cross sections in the propagation calculations to derive the source composition of these elements. We find (1) the source 13C/12C ratio is 2.5 σ lower than the solar ratio of 1.1%. (2) For N we find the source 14N/16O ratio to be 5.0% and the source 15N/16O ratio to be 0.97% about 1 σ larger than the ratio of 0.37% expected for a solar composition. (3) The source 18O/16O ratio is determined to be 0.24±0.17% including both measurement and propagation errors, almost exactly the solar ratio of 0.23%. The implications of these results for cosmic-ray origin theories are discussed.
Ferrando Ph.
Lukasiak Andrew
McDonald Frank B.
Webber William R.
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