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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. https://resolver.caltech.edu/CaltechAUTHORS:20140909-090921312

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Abstract

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
http://dx.doi.org/10.1086/168082DOIArticle
http://adsabs.harvard.edu/doi/10.1086/168082ADSAbstract
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
Funders:
Funding AgencyGrant Number
NASANAG 8-498
NASANAG 8-500
NASANAG 8-502
NASANGR 0-02-160
NASANGR 24-005-050
NASANGR 26-008-001
Subject Keywords:cosmic rays: abundances; nucleosynthesis
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1989-03
Issue or Number:2
Record Number:CaltechAUTHORS:20140909-090921312
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140909-090921312
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49483
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:09 Sep 2014 21:32
Last Modified:03 Oct 2019 07:14

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