Implications for Cosmic Ray Propagation from ACE Measurements of Radioactive Clock Isotope Abundances

Details Implications for Cosmic Ray Propagation from ACE Measurements of Radioactive Clock Isotope Abundances Implications for Cosmic Ray Propagation from ACE Measurements of Radioactive Clock Isotope Abundances

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3....9y&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

Galactic cosmic rays (GCR) interact to produce secondary fragments as they pass through the interstellar medium (ISM). Abundances of the long-lived radioactive secondaries 10 Be, 26 Al, 36 Cl, and 54 Mn can be used to a derive the confinement time of cosmic rays in the galaxy. Abundances for these species have been measured recently using the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE) spacecraft. To interpret this data we have modeled the production and propagation of the radioactive secondaries, taking into account recently published isotopic production cross-sections. Abundances for all species are consistent with a confinement time of esc ˜ 22x106 years.

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