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Measurements of ultraheavy cosmic rays with HEAO-3 (1987)

Klarmann, J. ; Waddington, C. J. ; Garrard, T. L. ; [et al.]

In: CASI

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Publication Date: 2019-06-28

Description: 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.

Keywords: SPACE RADIATION

Type: NASA Goddard Space Flight Center, Greenbelt, Md. Essays in Space Science; p 173-189

Format: application/pdf

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