Other
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..516..310w&link_type=abstract
26TH INTERNATIONAL COSMIC RAY CONFERENCE: ICRC XXVI, Invited, Rapporteur, and Highlight Papers. AIP Conference Proceedings, Vol
Other
Neutrino, Muon, Pion, And Other Elementary Particle Detectors, Cosmic Ray Detectors, Cosmic Rays, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays
Scientific paper
Using the Trek detector, we have measured the abundances of the heaviest elements (with Z>70) in the galactic cosmic rays with sufficient charge resolution to resolve the even-Z elements. We find that the abundance of Pb compared to Pt is ~3 times lower than the value expected from the most widely-held class of models of the origin of galactic cosmic ray nuclei, that is, origination in a partially ionized medium with solar-like composition. The low abundance of Pb is, however, consistent with the interstellar gas and dust model of Meyer, Drury and Ellison, and with a source enriched in r-process material, proposed by Binns et al. A high-resolution, high-statistics measurement of the abundances of the individual actinides would distinguish between these models. This is the goal of ECCO, the Extremely Heavy Cosmic-ray Composition Observer, which we plan to deploy on the International Space Station. .
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