Abundances of cosmic ray nuclei heavier than 50 SnPreliminary results are reported from 430 days of exposure of the heavy nuclei experiment on the HEAO-3 spacecraft. These results are confined to the heavy nuclei with Z equal to or greater than 50 and emphasize the conclusions obtained on the relative numbers of actinides and heavy stable elements in the lead-platinum region. The extreme paucity of actinides found is inconsistent with the predictions of a cosmic ray source that is highly enriched in r-process material, but quite consistent with a source whose composition is similar to that of normal solar system material. An upper limit, at the 95 percent confidence level, is placed in the ratio of nuclei with Z equal to or greater than 88/(Z in the range from 74 to 87) of 0.03.
Document ID
19820046866
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Waddington, C. J. (Minnesota Univ. Minneapolis, MN, United States)
Fickle, R. K. (Minnesota, University Minneapolis, MN, United States)
Garrard, T. L. (Minnesota Univ. Minneapolis, MN, United States)
Stone, E. C. (California Institute of Technology Pasadena, CA, United States)
Binns, W. R. (Minnesota Univ. Minneapolis, MN, United States)
Israel, M. H. (Minnesota Univ. Minneapolis, MN, United States)
Klarmann, J. (Washington University St. Louis, MO, United States)