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Abundances of ultraheavy elements in the cosmic radiation: results from HEAO 3

Binns, W. R. and Garrard, T. L. and Gibner, P. S. and Israel, M. H. and Kertzman, M. P. and Klarmann, J. and Newport, B. J. and Stone, E. C. and Waddington, C. J. (1989) Abundances of ultraheavy elements in the cosmic radiation: results from HEAO 3. Astrophysical Journal, 346 (2). pp. 997-1009. ISSN 0004-637X. doi:10.1086/168082.

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We report here an analysis that, for the first time, systematically normalizes the data from the HEAO 3 Heavy Nuclei Experiment on .the cosmic-ray abundances of all the elements heavier than germanium to that of .iron. In the range of atomic number Z, 33 ≤Z ≤60, the analysis yields abundances of odd-even element pairs. These abundances are consistent with a cosmic-ray source having a composition similar to that of the solar system, but subject to source fractionation correlated with the first ionization potential (FIP) of each element. For Z > 60, the analysis yields abundances of element groups. For these heaviest nuclei, we find an enhancement of the abundance of the platinum group, elements with 74 ≤ Z ≤ 80, relative to that in a propagated solar system source, and a corresponding increase in the abundance of the largely secondary elements in the range 62 ≤ Z ≤ 73. These abundances suggest that there is an enhancement of the r-process contribution to the source nuclei in the Z > 60 charge region. Over the entire region of charge, standard leaky box models of propagation satisfactorily model secondary production.

Item Type:Article
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Israel, M. H.0000-0002-8104-208X
Stone, E. C.0000-0002-2010-5462
Additional Information:© 1989 American Astronomical Society. Received 1989 February 21; accepted 1989 May 12. This research was supported in part by NASA under grants NAG 8-498, 500, and 502; and NGR 0-02-160, 24-00-50, and 26-008-001. Brownlee Gauld's assistance in computer programming was exceptional.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 0-02-160
NASANGR 24-005-050
NASANGR 26-008-001
Subject Keywords:cosmic rays: abundances; nucleosynthesis
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1989-03
Issue or Number:2
Record Number:CaltechAUTHORS:20140909-090921312
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49483
Deposited On:09 Sep 2014 21:32
Last Modified:10 Nov 2021 18:44

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