Observations of the Li, Be, and B isotopes and constraints on cosmic-ray propagation
/ Authors
G. Nolfo, I. Moskalenko, I. Moskalenko, W. Binns, E. Christian, A. Cummings, A. Davis, J. George, J. George, P. Hink
and 9 more authors
M. Israel, R. Leske, M. Lijowski, R. Mewaldt, E. Stone, A. Strong, T. T. Rosenvinge, M. Wiedenbeck, N. Yanasak
/ Abstract
The abundance of Li, Be, and B isotopes in galactic cosmic rays (GCRs) between E = 50 and 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, and 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 ˜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.
Journal: Advances in Space Research