Abstract
We have made a measurement of the elemental abundance of cosmic rays with atomic number 72 < Z < 83. We made this measurement as part of the Extended Analysis of the Trek Detector (hereafter Extended-Trek). The Trek detector consisted of 150 stacks, each of 16 sheets, of BP-1 glass exposed on the Russian space station Mir. In the original analysis of Trek, 245 cosmic-ray events were analyzed. The cosmic-ray elemental abundance pattern observed by Trek was strongly inconsistent with a popular model of the Galactic cosmic-ray source. For Extended-Trek, we reanalyzed 146 events in the ~100 stacks that were calibrated with relativistic gold ions at two zenith angles. These correspond to a collecting area of approximately 0.7 m2. The Extended-Trek analysis improved the resolution of cosmic-ray charge to 0.34e over 0.39e-0.45e in the original Trek analysis and confirmed the cosmic-ray abundance pattern observed by Trek.
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