The Origin of Primary Cosmic Rays: Constraints from ACE Elemental and Isotopic Composition Observations

Details The Origin of Primary Cosmic Rays: Constraints from ACE Elemental and Isotopic Composition Observations The Origin of Primary Cosmic Rays: Constraints from ACE Elemental and Isotopic Composition Observations

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ssrv...99...15w&link_type=abstract

Space Science Reviews, v. 99, Issue 1/4, p. 15-26 (2001).

Computer Science

19

Scientific paper

Cosmic-ray isotope observations from NASA's Advanced Composition Explorer (ACE) mission have been used to investigate the composition of cosmic-ray source material. Source abundances relative to ^56Fe are reported for eleven isotopes of Ca, Fe, Co, and Ni, including the very rare isotopes ^48Ca and ^64Ni. Although the source abundances range over a factor ~10^4, most of the ratios to ^56Fe are consistent with solar-system values to within ~20%. However, there are some notable differences, the most significant being an excess of ~(70+/-30)% relative to the solar system for the cosmic-ray source ratio ^58Fe/^56Fe. The possible association of such an excess with a contribution to the cosmic-ray source from Wolf-Rayet star ejecta is discussed.

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