Observations of the Li, Be, and B isotopes and constraints on cosmic-ray propagation

Details Observations of the Li, Be, and B isotopes and constraints on cosmic-ray propagation Observations of the Li, Be, and B isotopes and constraints on cosmic-ray propagation

2006-11-09

arxiv.org/abs/astro-ph/0611301v1

Adv.SpaceRes.38:1558-1564,2006

Astronomy and Astrophysics

Astrophysics

9 pages of TeX format with three figures. Accepted for publication to Advances in Space Research (Elsevier)

Scientific paper

10.1016/j.asr.2006.09.008

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. \iffalse Precise observations of Li, Be, and B in addition to well-measured production cross-sections are used to further constrain GCR propagation models. \fi 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 $\sim$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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