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Lead, platinum, and other heavy elements in the primary cosmic radiation - HEAO 3 resultsAn observation of the abundances of cosmic-ray lead-group and platinum-group nuclei is reported, using data from the HEAO 3 Heavy Nuclei Experiment. From an analysis of 580 days of exposure, 322 nuclei were selected with reasonable charge resolution, E at least 1.3 GeV/nucleon and Z at least 50. The data show a defined abundance peak in the 'platinum' region (Z from 74 to 80), a small abundance of 'lead' (Z from 81 to 83), and a significant number of 'secondary' nuclei in the range of Z between 62 and 73. Possible explanations are offered for the deduced ratio in space of 0.25 plus or minus 0.09 for 'Pb/Pt' being distinctly lower than that predicted by any of the standard models for cosmic-ray sources and propagation effects.
Document ID
19860027725
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Binns, W. R.
(Minnesota Univ. Minneapolis, MN, United States)
Israel, M. H.
(Washington University St. Louis, MO, United States)
Brewster, N. R.
(Minnesota Univ. Minneapolis, MN, United States)
Fixsen, D. J.
(Minnesota, University Minneapolis, United States)
Garrard, T. L.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 297
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
86A12463
Funding Number(s)
CONTRACT_GRANT: NGR-26-008-001
CONTRACT_GRANT: NGR-05-002-160
CONTRACT_GRANT: NGR-24-005-050
CONTRACT_GRANT: NAS8-27976
CONTRACT_GRANT: NAS8-27977
CONTRACT_GRANT: NAS8-27978
Distribution Limits
Public
Copyright
Other

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