CaltechAUTHORS
Published March 15, 1980 | Version Published
Journal Article Open

The Isotopic Composition of Galactic Cosmic-Ray Iron Nuclei

Creators

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.

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Additional details

Identifiers

Eprint ID
45014
DOI
10.1086/183211
Resolver ID
CaltechAUTHORS:20140417-135449903

Related works

Describes
http://adsabs.harvard.edu/abs/1980ApJ...236L.121M (URL)

Funding

NASA
NAS5-20721
NASA
NGR 05-002-160

Dates

Created
2014-04-28
Created from EPrint's datestamp field
Updated
2021-11-10
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Caltech Custom Metadata

Caltech groups
Space Radiation Laboratory , Physics Department
Other Numbering System Name
Space Radiation Laboratory
Other Numbering System Identifier
1979-11