The 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 …
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Cummings, A. C.
Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA
Davis, A. J.
Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA
George, J. S.
Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA; The Aerospace Corporation, M2/260, Los Angeles, CA 90009, USA
Hink, P. L.
Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130 USA
Israel, M. H.
Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130 USA
Leske, R. A.
Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA; The Aerospace Corporation, M2/260, Los Angeles, CA 90009, USA
Lijowski, M.
Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130 USA
Mewaldt, R. A.
Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA; The Aerospace Corporation, M2/260, Los Angeles, CA 90009, USA
Stone, E. C.
Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA; The Aerospace Corporation, M2/260, Los Angeles, CA 90009, USA
Strong, A. W.
Max-Plank-Institut für extraterrestische Physik, Postfach 1603, D-85740 Garching, Germany
von Rosenvinge, T. T.
NASA/Goddard Space Flight Center, Code 661, Greenbelt, MD 20771 USA
Wiedenbeck, M. E.
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA
Yanasak, N. E.
Space Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA; The Aerospace Corporation, M2/260, Los Angeles, CA 90009, USA
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The 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.
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de Nolfo, Georgia A.; Moskalenko, I. V.; Binns, W. R.; Christian, E. R.; Cummings, A. C.; Davis, A. J. et al.Observations of the Li, Be, and B isotopes and Constraints on Cosmic-ray Propagation,
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November 15, 2006;
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