Isotopic anomalies in the galactic cosmic-ray source

Details Isotopic anomalies in the galactic cosmic-ray source Isotopic anomalies in the galactic cosmic-ray source

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phrvl..46..682w&link_type=abstract

Physical Review Letters, vol. 46, Mar. 9, 1981, p. 682-685.

Astronomy and Astrophysics

Astronomy

40

Cosmic Rays, Galactic Radiation, Magnesium Isotopes, Neon Isotopes, Nuclear Fusion, Oxygen Isotopes, Abundance, Astronomical Models, Augmentation, Histograms, Solar System, Stellar Evolution, Stellar Mass Ejection

Scientific paper

Observations of the isotopic compositions of oxygen, neon and magnesium nuclei in galactic cosmic rays are presented and discussed in terms of nucleosynthesis at the galactic cosmic ray source. The observations, made with a charged-particle telescope carried aboard ISEE-3, show enhancements in the Ne-22/Ne-20, Mg-25/Mg-24 and Mg-26/Mg-24 ratios with respect to solar system abundances by factors of 4.1, 1.6 and 1.6, respectively. The data thus demonstrate that the galactic cosmic ray source is compositionally distinct from the solar system, and also rule out the models of Woolsey and Weaver (in press) for the synthesis of excess Ne-22 and a model of normal star formation, evolution and mass loss in a region enriched in metals.

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