The Abundances of Ultraheavy Elements in the Cosmic Radiation
Abstract
Analysis of a new, higher resolution data set from the Heavy Nuclei Experiment on the HEA0-3 spacecraft has yielded the cosmic ray abundances relative to iron of oddeven element pairs with atomic number, Z, in the range 33≤Z≤60. The abundances are consistent with a solar-system source provided an allowance is made for a source fraetionation based on first ionization potential (FIP). However, extending this analysis· to element groups with Z>60, we find enhancements of the Pt group (74≤Z≤80) abundance relative to the solar system and a corresponding increase in the largely secondary nuclei in the range 62≤Z≤73, in agreement with recent Ariel-6 results. These abundances suggest an enhancement of the r-process contribution to the source of the Z > 60 nuclei.
Additional Information
© INR. Provided by the NASA Astrophysics Data System. This research was supported in part by NASA under grants NAG 8-498, 500, and 502 and NCR 05-002-160, 24-005,050, and 26-008-001.Attached Files
Published - 1987-05.pdf
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Additional details
- Eprint ID
- 45693
- Resolver ID
- CaltechAUTHORS:20140512-133126620
- NAG 8-498
- NASA
- NAG 8-500
- NASA
- NAG 8-502
- NASA
- NCR 05-002-160
- NASA
- NCR 24-005-005
- NASA
- NCR 26-008-001
- NASA
- Created
-
2014-05-12Created from EPrint's datestamp field
- Updated
-
2020-03-09Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1987-05