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The cosmic-ray contribution to galactic abundances of the light elements: Interpretation of GCR LiBeB abundance measurements from ACE/CRIS

Yanasak, N. E. and de Nolfo, G. A. and Binns, W. R. and Christian, E. R. and Cummings, A. C. and Davis, A. J. and George, J. S. and Hink, P. L. and Israel, M. H. and Leske, R. A. and Lijowski, M. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2001) The cosmic-ray contribution to galactic abundances of the light elements: Interpretation of GCR LiBeB abundance measurements from ACE/CRIS. In: Solar and Galactic Composition. AIP Conference Proceedings. No.598. American Institute of Physics , Melville, NY, pp. 245-250. ISBN 0-7354-0042-3

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Inelastic collisions between the galactic cosmic rays (GCRs) and the interstellar medium (ISM) are responsible for producing essentially all of the light elements Li, Be, and B (LiBeB) observed in the cosmic rays. Previous calculations (e.g., [1]) have shown that GCR fragmentation can explain the bulk of the existing LiBeB abundance in the present day Galaxy. However, elemental abundances of LiBeB in old halo stars indicate inconsistencies with this explanation. We have used a simple leaky-box model to predict the cosmic-ray elemental and isotopic abundances of LiBeB in the present epoch. We conducted a survey of recent scientific literature on fragmentation cross sections and have calculated the amount of uncertainty they introduce into our model. The predicted particle intensities of this model were compared with high energy (E_(ISM) = 200–500 MeV/nucleon) cosmic-ray data from the Cosmic Ray Isotope Spectrometer (CRIS), which indicates fairly good agreement with absolute fluxes for Z ≥ 5 and relative isotopic abundances for all LiBeB species.

Item Type:Book Section
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Additional Information:© 2001 American Institute of Physics. This research was supported by NASA at the California Institute of Technology, (grant NAG5-6912), the Jet Propulsion Laboratory, the NASA Goddard Space Flight Center, and Washington University.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASA Goddard Space Flight CenterUNSPECIFIED
Washington UniversityUNSPECIFIED
Subject Keywords:Galaxy, element relative abundance, cosmic ray interactions, interstellar matter, cosmic ray composition, nuclear reactions and scattering, modelling, astronomical techniques
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-61
Classification Code:PACS: 98.35.Bd; 98.38.Am; 98.70.Sa; 95.30.Cq
Record Number:CaltechAUTHORS:20111222-093454569
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28565
Deposited By: Tony Diaz
Deposited On:22 Dec 2011 23:23
Last Modified:04 Mar 2015 17:47

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