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Ultra heavy nuclei in the cosmic radiationThis paper describes the measurements of the ultraheavy cosmic ray abundances obtained by the Heavy Nuclei Experiment aboard the NASA High Energy Astronomy Observatory-3. It is found that the cosmic ray abundances are in broad agreement with solar system abundances with a step-FIP fractionation model applied although in detail there are some differences. In particular, Ge and Pb appear to be underabundant in the cosmic radiation. Although the platinum/lead ratio and the actinides are consistent with some r-process enhancement, the cosmic ray source is not dominated by the r-process up through the 50s as evidenced by the Sr/Rb ratio and by the abundance of Sn and Ba. The actinides are not greatly enhanced, ruling out freshly synthesized r-process production as the primary source of the heavy cosmic rays.
Document ID
19880049812
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Binns, W. Robert
(Washington University Saint Louis, MO, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Subject Category
Space Radiation
Meeting Information
Meeting: Genesis and propagation of cosmic rays
Location: Erice
Country: Italy
Start Date: June 1, 1986
End Date: June 9, 1986
Accession Number
88A37039
Funding Number(s)
CONTRACT_GRANT: NAG8-498
Distribution Limits
Public
Copyright
Other

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