On the abundances of ultraheavy cosmic rays

Details On the abundances of ultraheavy cosmic rays On the abundances of ultraheavy cosmic rays

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..144l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 1, 1984, p. 144-150. Navy-supported research.

Astronomy and Astrophysics

Astrophysics

12

Abundance, Cosmic Rays, Approximation, Galactic Cosmic Rays, Ionization Potentials, Nuclear Fusion, Particle Acceleration

Scientific paper

Recent data from the HEAO 3 and Ariel 6 satellites on elemental abundances of ultraheavy cosmic rays (Z in the range from 33 to 83) are analyzed using a new propagation code. General agreement with earlier analyses is observed. Evidence for a breakdown of the correlation between ionization potentials and the solar system/cosmic-ray source abundance ratio is presented. It is found that the best fit to experimental data (approximately 5 GeV per nucleon) occurs when propagation is calculated at lower energies (approximately 1 GeV per nucleon). This is interpreted as evidence for distributed acceleration of cosmic rays. Additional effects, including ionization loss, altered path-length distributions, and r-process enhancement, are considered.

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