Grove, J. E. and Christian, E. R. and Mewaldt, R. A. and Schindler, S. M. and Stone, E. C. and Buffington, A. and Rasmussen, I. L.
(1990)
A Measurement of the Isotopic Composition of Cosmic Ray Iron.
In:
Proceedings of the 21st International Cosmic Ray Conference.
Vol.3.
University of Adelaide
, Northfield, South Australia, pp. 53-56.
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Abstract
We present a new measurement of the isotopic composition of cosmic ray iron in the energy
interval ~1550-2200 MeV /nucleon. The data were collected during the May 1984 flight of a balloon-borne spectrometer and show an average mass resolution of ~0.7 amu. The instrument employed the Cerenkov-Energy technique for mass determination. The observed ^(54)Fe/^(56)Fe ratio, 0.14 +0.18/-0.11 at the top of the atmosphere, is consistent with a solar system composition at the cosmic ray source. We also place an upper limit on the ^(58)Fe/^(56)Fe ratio at the top of the atmosphere of ≤.07. Both are consistent with previous
measurements at lower energies.
| Item Type: | Book Section |
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| Additional Information: | © Organizing Committee of the 21st Int. Cosmic Ray Conf. Provided by the NASA Astrophysics Data System.
This work was supported in part by NASA under grant NGR 05-
002-160. We are grateful to P. S. Gibner for his contributions to this work and to the personnel
of the National Scientific Balloon Facility and the Wallops Flight Facility for their
excellent support. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NCR 05-002-160 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1989-14 |
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| Record Number: | CaltechAUTHORS:20140509-091626822 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140509-091626822 |
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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: | 45633 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Joy Painter
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| Deposited On: | 09 May 2014 16:36 |
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| Last Modified: | 09 Mar 2020 13:18 |
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