The abundances of the heavier elements in the cosmic radiation

Current work on the abundances of the ultraheavy elements in the cosmic radiation, i.e., those with Z greater than 30 is reviewed. Those abundances are compared with predictions based on propagation and fractionation of elemental abundances from various assumed sources of the cosmic rays. Striking similarities are found between the solar system and the cosmic ray source abundances for those elements with Z values between 32 and 60. For elements with Z greater than 60, there appears to be a substantial enhancement in the abundances of elements synthesized in the r-process.