The source charge and isotopic abundances of cosmic rays with Z = 9-16 - A study using new fragmentation cross sections

Details The source charge and isotopic abundances of cosmic rays with Z = 9-16 - A study using new fragmentation cross sections The source charge and isotopic abundances of cosmic rays with Z = 9-16 - A study using new fragmentation cross sections

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..611w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 611-620.

Astronomy and Astrophysics

Astrophysics

17

Abundance, Astronomical Models, Cosmic Rays, Isotopes, Chemical Composition, Ionization Potentials, Milky Way Galaxy, Nuclear Fusion, Solar Corona

Scientific paper

The cosmic ray source charge and isotopic abundances for charges with Z = 9-16 are reexamined using newly measured fragmentation cross sections in a standard Galactic propagation model. Compared with earlier studies, the cosmic-ray data are now consistent with no excess of Si-29 and Si-30 in the source relative to the solar coronal abundances. The excess of Mg-25 and Mg-26 is now about 1 sigma or less relative to solar coronal isotopic abundances, leaving Ne-22 as the only clearly established neutron-rich isotopic excess in the cosmic ray source. Better estimates of the source abundances of elements obtained using the new cross sections permit the conclusion that high first ionization potential (FIP) elements have a wide spread of compositional differences in the cosmic-ray source relative to solar coronal abundances, whereas elements with a low FIP have a composition similar to the solar corona.

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