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Observations of the Li, Be, and B Isotopes and Constraints on Cosmic-ray PropagationThe abundance of Li, Be, and B isotopes in galactic cosmic rays (GCR) between E=50-200 MeV/nucleon has been observed by the Cosmic Ray Isotope Spectrometer (CRIS) on NASA's ACE mission since 1997 with high statistical accuracy. Precise observations of Li, Be, B can be used to constrain GCR propagation models. We find that a diffusive reacceleration model with parameters that best match CRIS results (e.g. B/C, Li/C, etc) are also consistent with other GCR observations. A approx. 15-20% overproduction of Li and Be in the model predictions is attributed to uncertainties in the production cross-section data. The latter becomes a significant limitation to the study of rare GCR species that are generated predominantly via spallation.
Document ID
20070004863
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
deNolfo, G. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Moskalenko, I. V. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Binns, W. R. (Washington Univ. Saint Louis, MO, United States)
Christian, E. R. (NASA Headquarters Washington, DC United States)
Cummings, A. C. (California Inst. of Tech. Pasadena, CA, United States)
Davis, A. J. (California Inst. of Tech. Pasadena, CA, United States)
George, J. S. (California Inst. of Tech. Pasadena, CA, United States)
Hink, P. L. (Washington Univ. Saint Louis, MO, United States)
Israel, M. H. (Washington Univ. Saint Louis, MO, United States)
Leske, R. A. (California Inst. of Tech. Pasadena, CA, United States)
Lijowski, M. (Washington Univ. Saint Louis, MO, United States)
Mewaldt, R. A. (California Inst. of Tech. Pasadena, CA, United States)
Stone, E. C. (California Inst. of Tech. Pasadena, CA, United States)
Strong, A. W. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
vonRosenvinge, T. T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wiedenbeck, M. E. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Yanasak, N. E. (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2007
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-6912
Distribution Limits
Public
Copyright
Public Use Permitted.

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