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Articles
Cosmic-Ray Record in Solar System Matter
1 Staff member in the Nuclear Chemistry Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and is currently a visiting scientist at Max-Planck-Institut für Chemie, D-6500 Mainz, Federal Republic of Germany
The energetic nuclei in cosmic rays interact with meteoroids, the moon, planets, and other solar system matter. The nuclides and heavy nuclei tracks produced by the cosmic-ray particles in these targets contain a wealth of information about the history of the objects and temporal and spatial variations in the particle fluxes. Most lunar samples and meny meteorites have complex histories of cosmicray exposure from erosion, gardening, fragmentation, orbital changes, and other processes. There appear to be variations in the past fluxes of solar particles, and possibly also galactic cosmic rays, on time scales of 104 to 107 years.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)