Published March 15, 1980
| Published
Journal Article
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The Isotopic Composition of Galactic Cosmic-Ray Iron Nuclei
Abstract
We report high-resolution observations made in interplanetary space of 83-284 MeV per nucleon galactic cosmic-ray iron isotopes are reported and it is directly established that ^(56)Fe is the dominant cosmic-ray Fe isotope. The following percentage abundances for Fe at the cosmic-ray source are found: ^(54)Fe = 9(+8, -5)%, ^(55)Fe ≤ 7%, ^(56)Fe = 91(+5, -11)%, ^(57)Fe ≤ 8%, and ^(58)Fe ≤ 6%. When compared to calculated nucleosynthesis yields and other observations, these results place significant constraints on the neutron excess of the environment where cosmic-ray Fe originates.
Additional Information
© 1980. The American Astronomical Society. Received 1979 October 9; accepted 1979 November 28) 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. This work was supported in part by NASA under contract NAS5-20721 and grant NGR 05-002-160.Attached Files
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Additional details
- Eprint ID
- 45014
- DOI
- 10.1086/183211
- Resolver ID
- CaltechAUTHORS:20140417-135449903
- NAS5-20721
- NASA
- NGR 05-002-160
- NASA
- Created
-
2014-04-28Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1979-11