Abundances of cosmic ray nuclei heavier than 50 SN
Abstract
Preliminary 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.
- Publication:
-
International Cosmic Ray Conference
- Pub Date:
- 1981
- Bibcode:
- 1981ICRC....9..109W
- Keywords:
-
- Abundance;
- Cosmic Rays;
- Heavy Nuclei;
- Heao 3;
- Space Radiation;
- ABUNDANCE;
- COSMIC RAYS;
- HEAVY NUCLEI;
- HEAO 3