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:20140210-112418931
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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 and directly establish that ^(56)Fe is the dominant cosmic-ray Fe isotope. We find the following percentage abundances for Fe at the cosmic-ray source: ^(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.
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| Additional Information: | © 1980 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 NASS-20721 and grant NGR 05-002-160. | |||||||||
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| Subject Keywords: | cosmic rays: abundances, nucleosynthesis | |||||||||
| DOI: | 10.1086/183211 | |||||||||
| Record Number: | CaltechAUTHORS:20140210-112418931 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140210-112418931 | |||||||||
| Official Citation: | The isotopic composition of galactic cosmic-ray iron nuclei Mewaldt, R. A., Spalding, J. D., Stone, E. C., & Vogt, R. E. Astrophysical Journal, Part 2 - Letters to the Editor, vol. 236, Mar. 15, 1980, p. L121-L125. | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 43739 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 10 Feb 2014 21:01 | |||||||||
| Last Modified: | 10 Nov 2021 16:42 |
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