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Published 2001 | Published
Book Section - Chapter Open

CRIS Measurements of Electron-Capture-Decay Isotopes: ^(37)Ar, ^(44)Ti, ^(49)V, ^(51)Cr, ^(55)Fe, and ^(57)Co


The secondary isotopes ^(37)Ar, ^(44)Ti, ^(49)V, ^(51)Cr, ^(55)Fe, and ^(57)Co decay only by electron capture, which occurs preferentially at the lower cosmic-ray energies, where electron attachment is more likely. Measurements of the abundances of these isotopes may reveal the interstellar energies of cosmic rays during propagation and whether reacceleration occurred. Stable secondary isotopes may also be used to examine energy dependence and reacceleration. The Cosmic Ray Isotope Spectrometer has detected large numbers of these nuclei at 100 - 500 MeV/nucleon during a time spanning solar minimum and solar maximum, allowing an additional study of solar modulation. This paper will discuss several subiron abundance ratios and the implications for reacceleration and solar modulation.

Additional Information

© Copernicus GmbH. This research was supported by the National Aeronautics and Space Administration at the California Institute of Technology (under grant NAG5-6912), the Goddard Space Flight Center, the Jet Propulsion Laboratory, and Washington University in St. Louis. One of us (S.M.N.) also wishes to acknowledge the support of the Mr. and Mrs. Spencer T. Olin Foundation.

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August 19, 2023
October 20, 2023