Physics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..apr.t8005i&link_type=abstract
American Physical Society, 2008 APS April Meeting and HEDP/HEDLA Meeting, April 11-15, 2008, abstract #T8.005
Physics
Scientific paper
The TIGER instrument flew on high-altitude balloons over Antarctica for 50 days. The observed elemental abundances with 26<=Z<=34, when corrected for fragmentation during propagation in the Galaxy and in the atmosphere, show cosmic-ray source abundances that differ from the standard Solar System (SS) abundances. Preferential acceleration of refractory elements does not fully explain these differences. They can be accounted for by a source mixture of ˜80% SS and ˜20% representative of the ejecta from massive stars, which mixture is then affected by elemental volatility in the acceleration process. This 80/20 mixture has also been shown to account for the isotopic composition of lighter cosmic rays and can be understood as the result of cosmic-ray acceleration in OB associations.
Binns Robert W.
Christian Eric R.
de Nolfo Georgia Adair
Geier Stephan
Israel Martin H.
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