Published September 15, 2000
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Constraints on cosmic-ray acceleration and transport from isotope observations
Abstract
Observations from the Cosmic Ray Isotope Spectrometer (CRIS) on ACE have been used to derive constraints on the locations, physical conditions, and time scales for cosmic-ray acceleration and transport. The isotopic composition of Fe, Co, and Ni is very similar to that of solar system material, indicating that cosmic rays contain contributions from supernovae of both Type II and Type Ia. The electron-capture primary ^(59)Ni produced in supernovae has decayed, demonstrating that a time ≳10^5 yr elapses before acceleration of the bulk of the cosmic rays and showing that most of the accelerated material is derived from old stellar or interstellar material rather than from fresh supernova ejecta.
Additional Information
© 2000 American Institute of Physics. Issue Date: 15 September 2000. This research was supported by the National Aeronautics and Space Administration at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, the Goddard Space Flight Center, and Washington University.Attached Files
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Additional details
- Eprint ID
- 28272
- Resolver ID
- CaltechAUTHORS:20111201-093810051
- NAG5-6912
- NASA
- JPL
- Goddard Space Flight Center
- Washington University
- Created
-
2011-12-01Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Series Name
- AIP Conference Proceedings
- Series Volume or Issue Number
- 528
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 2000-29