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The Cosmic-Ray Contribution to LiBeB: Interpretation of LiBeB Abundances from CRIS

Leske, R. A. and Mewaldt, R. A. and Cohen, C. M. S. and Cummings, A. C. and Stone, E. C. and Slocum, P. L. and Wiedenbeck, M. E. (2001) The Cosmic-Ray Contribution to LiBeB: Interpretation of LiBeB Abundances from CRIS. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.5. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 1831-1834.

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The bulk of galactic Li, Be, and B (LiBeB) abundances is believed to be created during energetic inelastic collisions of cosmic-ray and interstellar medium (ISM) nuclei. Additional sources such as big bang nucleosynthesis or neutrino-driven spallation within Type II supernovae may also add a small contribution. However, measurements of the elemental ratios Be/H, B/H, and Fe/H in old, low-metallicity halo stars indicate an overabundance of LiBeB that can not be accounted for by fragmentation of cosmic-ray CNO. This interpretation assumes that the ISM in any epoch serves as a source of material both for star formation and for cosmic rays, which contribute fragmentation material in later epochs. We have simulated cosmic-ray transport using a simple model and present an interpretation of the abundance measurements from the Cosmic Ray Isotope Spectrometer (CRIS) during the past three years. We will discuss the implications on cosmic-ray LiBeB production at lower energies.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© Copernicus Gesellschaft 2001. This research was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2001-53
Record Number:CaltechAUTHORS:20150303-133259423
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55482
Deposited By: Deborah Miles
Deposited On:05 Mar 2015 03:57
Last Modified:09 Mar 2020 13:19

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