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Constraints on galactic cosmic-ray origins from elemental and isotopic composition measurements
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | vonRosevinge, T. T. Binns, W. R. deNolfo, G. A. Israel, M. H. Leske, R. A. Stone, E. C. Mewaldt, R. A, Christian, E. R. Wiedenbeck, M. E. Cummings, A. C. |
| Copyright Year | 2013 |
| Description | The most recent measurements by the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE) satellite of ultra-heavy cosmic ray isotopic and elemental abundances will be presented. A range of isotope and element ratios, most importantly Ne-22/Ne-20, Fe-58/Fe-56, and Ga-31/Ge -32 show that the composition is consistent with source material that is a mix of approx 80% ISM (with Solar System abundances) and 20% outflow/ejecta from massive stars. In addition, our data show that the ordering of refractory and volatile elements with atomic mass is greatly improved when compared to an approx 80%/20% mix rather than pure ISM, that the refractory and volatile elements have similar slopes, and that refractory elements are preferentially accelerated by a factor of approx 4. We conclude that these data are consistent with an OB association origin of GCRs. |
| File Size | 79930 |
| Page Count | 4 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140009149 |
| Archival Resource Key | ark:/13960/t5hb4492f |
| Language | English |
| Publisher Date | 2013-07-02 |
| Access Restriction | Open |
| Subject Keyword | Galactic Cosmic Rays Gcr Composition Gcr Origin Advanced Composition Explorer Supernova Remnants Chemical Composition Isotope Ratios Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
