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Cosmic-ray energy spectra between 10 and several hundred GeV per atomic mass unit for elements from Ar-18 to Ni-28 - Results from HEAO 3Results from the Heavy Nuclei experiment on HEAO 3 are used to determine the primary abundances of Ni and Fe. Ni and Fe are found to have nearly constant relative abundances over the interval of 10 to about 500 GeV per amu. Individual secondary elements derived principally from interactions of primary Fe nuclei are shown to display a power-law decrease in relative abundance up to about 150 GeV per amu. Ar/Fe and Ca/Fe ratios of 2.6 + or - 0.7 percent and 8.8 + or - 0.7 percent, respectively, are found, confirming a fractionation of source abundances in which elements with high values of the first ionization potential are depleted relative to those with low first ionization potential.
Document ID
19880038117
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Binns, W. R.
(California Inst. of Tech. Pasadena, CA, United States)
Israel, M. H.
(California Inst. of Tech. Pasadena, CA, United States)
Jones, Michael D.
(California Inst. of Tech. Pasadena, CA, United States)
Kamionkowski, M. P.
(Washington University Saint Louis, MO, United States)
Garrard, T. L.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
January 15, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 324
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
88A25344
Funding Number(s)
CONTRACT_GRANT: NAG8-498
CONTRACT_GRANT: NGR-05-002-160
CONTRACT_GRANT: NAG8-502
CONTRACT_GRANT: NAG8-500
CONTRACT_GRANT: NGR-26-008-001
CONTRACT_GRANT: NGR-24-005-050
Distribution Limits
Public
Copyright
Other

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