Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published September 15, 2000 | Published
Book Section - Chapter Open

Abundances of the cosmic ray β-decay secondaries and implications for cosmic ray transport


Galactic cosmic rays (GCRs) pass through the interstellar medium (ISM) and undergo nuclear interactions that produce secondary fragments. The abundances of radioactive secondary species can be used to derive a galactic confinement time for cosmic rays using the amount of ISM material traversed by the cosmic rays inferred from stable GCR secondary abundances. Abundance measurements of long-lived species such as ^(10)Be, ^(26)Al, ^(36)Cl, and ^(54)Mn allow a comparison of propagation histories for different parent nuclei. Abundances for these species, measured in the energy range ~ 50 - 500 MeV/nuc using the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE) spacecraft, indicate a confinement time τ(esc) 16.2±0.8 Myr. We have modeled the production and propagation of the radioactive secondaries and discuss the implications for GCR transport.

Additional Information

© 2000 American Institute of Physics. Published online 15 September 2000. This research was supported by the NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, NASA/Goddard Space Flight Center, and Washington University.

Attached Files

Published - 2000-30.pdf


Files (1.2 MB)
Name Size Download all
1.2 MB Preview Download

Additional details

August 19, 2023
January 13, 2024