Published 1999
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Measurements of the Isotopic Abundances of Galactic Cosmic Rays and Their Implications for Cosmic Ray Origin
Abstract
We present measurements of the nickel and cobalt isotopes from the Cosmic Ray Isotope Spectrometer (CRJS) which was launched in August, 1997 aboard the NASA Advanced Composition Explorer (ACE). The objectives of CRJS are to measure the isotopic abundances and energy spectra of galactic cosmic rays ~GCRs) with 3 ≤ Z ≤ 30. We find that for these nuclei the measured ^5Ni/^(60)Ni and ^(59)Co/^(60)Ni ratios imply a time delay between nucleosynthesis and acceleration to cosmic ray energies of > 10^5 y.
Additional Information
© Copyright 1988 - 2015 - Astronomical Society of the Pacific. We are grateful to the large number of individuals that contributed significantly to the development of the CRIS instrument (listed in Stone et al. 1998). This research has been supported by NASA at the California Institute of Technology (grant NAG5-6912), the Goddard Space Flight Center, the Jet Propulsion Laboratory, Washington University in St. Louis.Attached Files
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Additional details
- Eprint ID
- 54670
- Resolver ID
- CaltechAUTHORS:20150210-162025599
- NASA
- NAG5-6912
- Created
-
2015-02-22Created from EPrint's datestamp field
- Updated
-
2020-03-09Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1999-02