Grove, J. E. and Hayes, B. T. and Mewaldt, R. A. and Webber, W. R.
(1990)
The ^(54)Mn Clock and Its Implications for Cosmic Ray Propagation and Fe Isotope Studies.
In:
Proceedings of the 21st International Cosmic Ray Conference.
Vol.3.
Department of Physics and Mathematical Physics, The University of Adelaide
, Northfield, South Australia, pp. 397-400.
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Abstract
Radioactive ^(54)Mn, suggested as a clock for measuring the lifetime of heavy cosmic
rays, has a poorly known B-decay halflife estimated to be in the range from ~10^(5) to 10^(7) yr.
Some years ago Koch et al. concluded from measurements of the Mn/Fe ratio that a
significant fraction of low-energy (<l GeV/nuc) ^(54)Mn produced by Fe fragmentation had
decayed. Using a propagation code that includes improved fragmentation cross-sections,
and data from HEA0-3 and other spacecraft, we have re-examined the evidence for ^(54)Mn
decay. We conclude that present cosmic ray data cannot distinguish the possibility of ^(54)Mn
decay in cosmic rays, but point out that this question has important implications for studies
of the ^(54)Fe abundance in cosmic ray source material, as well as for cosmic ray propagation
studies.
Item Type: | Book Section |
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Additional Information: | © Organizing Committee of the 21st Int. Cosmic Ray Conference. Provided by the NASA Astrophysics Data System.
This work was supported in part by NASA under grants NAG8-618
and NCR 05-002-160. We appreciate the assistance of T. L. Garrard. |
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Group: | Space Radiation Laboratory |
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Funders: | Funding Agency | Grant Number |
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NASA | NAG8-618 | 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 | 1989-22 |
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Record Number: | CaltechAUTHORS:20140714-161626711 |
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Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140714-161626711 |
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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: | 47197 |
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Collection: | CaltechAUTHORS |
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Deposited By: |
Deborah Miles
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Deposited On: | 22 Jul 2014 20:21 |
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Last Modified: | 22 Nov 2019 09:58 |
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