| タイトル | Abundances of ultraheavy elements in the cosmic radiation - Results from HEAO 3 |
| 著者（英） | Gibner, P. S.; Israel, M. H.; Garrard, T. L.; Kertzman, M. P.; Binns, W. R. |
| 著者所属（英） | DePauw Univ.|Washington Univ.|California Inst. of Tech. |
| 発行日 | 1989-11-15 |
| 言語 | eng |
| 内容記述 | An analysis is presented that, for the first time, systematically normalizes the data from the HEAO 3 heavy nuclei experiment on the cosmic-ray abundances of all the elements heavier than germanium to that of iron. In the range of atomic number Z from 33 to 60, the analysis yields abundances of odd-even element pairs. The abundances are consistent with a cosmic-ray source having a composition similar to that of the solar system, but subject to source fractionation correlated with the first ionization potential (FIP) of each element. For Z greater than 60, the analysis yields abundances of element groups. For these heaviest nuclei, we find an enhancement of the abundance of the platinum group, elements with Z of 74-80, relative to that in propagated solar system source, and a corresponding increase in the abundance of the largely secondary elements in the 62-73 range. These abundances suggest that there is an enhancement of the r-process contribution to the source nuclei in the Z greater than 60 charge region. Over the entire region of charge, standard leaky box models of propagation satisfactorily model secondary production. |
| NASA分類 | SPACE RADIATION |
| レポートNO | 90A16246 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/359530 |
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