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High resolution measurements of galactic cosmic-ray neon, magnesium, and silicon isotopesHigh-resolution measurements of the abundances of individual isotopes of neon, magnesium and silicon in galactic cosmic rays are reported. The Caltech Heavy Isotope Spectrometer Telescope on board the ISEE 3 spacecraft was used to obtain measurements in the range 30 to 180 MeV/n at an rms mass resolution of 0.20 amu. Results indicate excesses of Ne-22 as well as Mg-25 and Mg-26 in galactic cosmic rays with respect to their solar system abundances. Calculations of the effects of interstellar propagation and solar modulation on cosmic-ray isotope abundances also imply an Mg-25 + Mg-26 cosmic ray source fraction significantly greater than the solar system fraction, and it is suggested that the cosmic ray source material and solar system material were synthesized under different conditions.
Document ID
19800039283
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mewaldt, R. A.
(California Inst. of Tech. Pasadena, CA, United States)
Spalding, J. D.
(California Inst. of Tech. Pasadena, CA, United States)
Stone, E. C.
(California Inst. of Tech. Pasadena, CA, United States)
Vogt, R. E.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
January 15, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
Space Radiation
Accession Number
80A23453
Funding Number(s)
CONTRACT_GRANT: NGR-05-002-160
CONTRACT_GRANT: NAS5-20721
Distribution Limits
Public
Copyright
Other

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