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Published July 25, 2005 | public
Journal Article

Isotopic Composition of Cosmic Rays: Results from the Cosmic Ray Isotope Spectrometer on the ACE Spacecraft


The Cosmic Ray Isotope Spectrometer on the ACE spacecraft measures the isotopic composition of cosmic-ray elements from Li through Zn with an unprecedented combination of excellent mass resolution and high statistics. The results indicate a cosmic-ray source whose composition is remarkably similar to that of the solar system, but which is enriched in material that may have originated in Wolf-Rayet stars. The lack of ^(59)Ni is strong indication that the cosmic rays are accelerated at least 10^5 years after nucleosynthesis. We examine these results in the context of the superbubble model of cosmic-ray origin that has been described by Higdon and Lingenfelter.

Additional Information

© 2005 Published by Elsevier B.V. This research was supported by NASA grant NAG5-6912 to the California Institute of Technology and by related NASA grants or subcontracts to the Jet Propulsion Laboratory, Goddard Space Flight Center, and Washington University.

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August 19, 2023
October 17, 2023