The isotopic source composition of cosmic-ray iron, cabolt, and nickel

M. E. Wiedenbeck, W. R. Binns, E. R. Christian, A. C. Cummings, A. J. Davis, J. S. George, P. L. Hink, M. H. Israel, R. A. Leske, M. Lijowski, R. A. Mewaldt, E. C. Stone, T. T. Von Rosenvinge, Nathan Eugene Yanasak

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The isotopic composition of cosmic-ray Fe, Co, and Ni at energies ~150-500 MeV/nucleon has been measured with the Cosmic-Ray Isotope Spectrometer (CRIS) instrument on ACE. Source abundances have been derived from a leaky-box propagation model using secondary species in the range 41 ≤ A ≤ 55 to constrain the calculated secondary contributions to the Fe, Co, and Ni isotopes. The derived relative source abundances bear a strong resemblance to solar-system values. The most significant difference, an excess of ~ (70 ± 30)%, is found for the source abundance ratio 58 Fe/ 56 Fe. Some implications of the derived source composition for the origin of cosmic rays are discussed.

Original languageEnglish (US)
Pages (from-to)773-778
Number of pages6
JournalAdvances in Space Research
Issue number4
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)


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