Ultra-heavy cosmic rays: Theoretical implications of recent observations

Details Ultra-heavy cosmic rays: Theoretical implications of recent observations Ultra-heavy cosmic rays: Theoretical implications of recent observations

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7814981b&link_type=abstract

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Computer Science

Abundance, Actinide Series Compounds, Cosmic Rays, Heavy Nuclei, Platinum, Carbonaceous Chondrites, Nuclear Fission, Nuclear Fusion, Skylab Program

Scientific paper

Extreme ultraheavy cosmic ray observations (Z greater or equal 70) are compared with r-process models. A detailed cosmic ray propagation calculation is used to transform the calculated source distributions to those observed at the earth. The r-process production abundances are calculated using different mass formulae and beta-rate formulae; an empirical estimate based on the observed solar system abundances is used also. There is the continued strong indication of an r-process dominance in the extreme ultra-heavy cosmic rays. However it is shown that the observed high actinide/Pt ratio in the cosmic rays cannot be fit with the same r-process calculation which also fits the solar system material. This result suggests that the cosmic rays probably undergo some preferential acceleration in addition to the apparent general enrichment in heavy (r-process) material. As estimate also is made of the expected relative abundance of superheavy elements in the cosmic rays if the anomalous heavy xenon in carbonaceous chondrites is due to a fissioning superheavy element.

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