Mewaldt, R. A. and Spalding, J. D. and Stone, E. C. and Vogt, R. E.
(1980)
The Isotopic Composition of Galactic Cosmic-Ray Iron Nuclei.
Astrophysical Journal, 236
.
L121-L125.
ISSN 0004-637X.
doi:10.1086/183211.
https://resolver.caltech.edu/CaltechAUTHORS:20140417-135449903
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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.
| Item Type: | Article |
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| Contact Email Address: | dmiles@caltech.edu |
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| 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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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NAS5-20721 | | NASA | NGR 05-002-160 |
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| Subject Keywords: | Abundance, Cosmic Rays, Galactic Radiation, Iron Isotopes, Nuclear Fusion, Nuclei (Nuclear Physics), International Sun Earth Explorer 3, Iron 57, Mass Ratios |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1979-11 |
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| DOI: | 10.1086/183211 |
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| Record Number: | CaltechAUTHORS:20140417-135449903 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140417-135449903 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 45014 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
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| Deposited On: | 28 Apr 2014 22:52 |
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| Last Modified: | 10 Nov 2021 16:59 |
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