Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nva..conf..255d&link_type=abstract
NEW VISTAS IN ASTROPHYSICS. Proceedings of the International School of Cosmic Ray Astrophysics 20th Anniversary, 11th Course. He
Astronomy and Astrophysics
Astrophysics
Scientific paper
Radioactive isotopes in the Galactic cosmic radiation provide a number of important measures of cosmic-ray propagation, source characterization, and acceleration mechanisms. These measures include determinations of the cosmic-ray propagation time (or alternately, the cosmic-ray escape time), the mean density of matter through which the cosmic rays have propagated, the existence (or even abundances) of radioactives in the Galactic cosmic-ray source, the nucleosynthetic history of the cosmic-ray source, the time lag between nucleosynthesis and acceleration, and the extent of adiabatic reacceleration during Galactic propagation. The Galactic cosmic rays consist of both primary (source) and secondary (spallogenic) particles--both populations can, in principal, host radioisotopes. It is the absolute timing of radioactive decay combined with the different possible source histories of the cosmic-ray populations that allow for so many important measurements.
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