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Published January 15, 1980 | Published
Journal Article Open

High-Resolution Measurements of Galactic Cosmic-Ray Neon, Magnesium and Silicon Isotopes


The individual isotopes of galactic cosmic-ray Ne, Mg, and Si at ~0.20 amu. Our results suggest that the cosmic ray source is enriched in ^(22)Ne, ^(25)Mg, and ^(26)Mg when compared to the solar system. In particular, we find (^(25)Mg + ^(26)Mg)/^(24)Mg = 0.49(+0.23, -0.14) compared with the solar system value of 0.27, suggesting that the cosmic-ray source and solar system material were synthesized under different conditions.

Additional Information

Copyright 1980. The American Astronomical Society. W.E. Althouse, A.C. Cummings and T.L. Garrard made significant contributions to the design and development of HIST. We are grateful to the Heckman/Greiner group, including Hank Crawford, and the Bevalac staff at Lawrence Berkeley Laboratory for making the heavy-ion calibrations possible. We have benefited from discussions of nucleosynthesis with W.A. Fowler and S.E. Woosley, and discussions of cosmic-ray propagation with M.E. Wiedenbeck. This work was supported in part by NASA under contract NGR 05-002-160.

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