Measurements of ultraheavy cosmic rays with HEAO-3

Details Measurements of ultraheavy cosmic rays with HEAO-3 Measurements of ultraheavy cosmic rays with HEAO-3

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2464..173b&link_type=abstract

In NASA Goddard Space Flight Center, Greenbelt, Md. Essays in Space Science p 173-189 (SEE N87-24247 17-88)

Physics

Abundance, Cosmic Rays, Heavy Nuclei, Solar System, Cerenkov Counters, Energy Spectra, Germanium, Heao 3, Lead (Metal), Scintillation Counters

Scientific paper

The HEAO-3 Heavy Nuclei Experiment has measured abundances of elements from Ar-18 to U-92 in the cosmic rays. The results on the ultraheavy elements, those with atomic numbers greater than 30, indicate that the source of the cosmic rays contain a mixture of r-process and s-process material similar to that found in the solar system. This result is at variance with previous indications that the sources are greatly enhanced with freshly synthesized r-process material. Apparent discrepancies between the results and the accepted solar-system abundance have led to a reexamination of data on photospheric abundances of Ge and Pb, resulting in suggested reductions in their values.

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