Computer Science
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt.........6s&link_type=abstract
Ph.D dissertation, 2005. Section 0252, Part 0606 218 pages; United States -- Missouri: Washington University; 2005. Publication
Computer Science
2
Cosmic Ray, Energy Loss, Heliosphere, Reacceleration
Scientific paper
Using data collected by the Cosmic Ray Isotope Spectrometer (CRIS) on the NASA Advanced Composition Explorer ( ACE ) spacecraft, I report on measurements of Galactic Cosmic Ray isotopes in the energy range from 50 to 550 MeV/nucleon, with emphasis on the electron-capture-decay secondaries, 37 Cl, 41 Ca, 44 Ti, 49 V, 51 Cr, 55 Fe and 57 Co. These isotopes, which decay only by electron- capture, are effectively stable in the cosmic rays at high energies where electron attachment is unlikely; at lower energies substantial electron attachment and decay does occur. By comparing the daughter-to-parent abundance ratios 49 Ti/ 49 V and 51 V/ 51 Cr during periods of solar minimum and solar maximum, I report new direct evidence of changes in the amount of energy loss that occurs in cosmic rays between solar minimum and solar maximum. Comparison of the electron-capture-decay abundance ratios with propagation models in the context of reacceleration are also presented. Analysis shows that little or no reacceleration is needed to correctly predict the energy-dependence of the electron-capture abundance ratios.
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