Abundances of Ultra-Heavy Galactic Cosmic Rays from the SuperTIGER Instrument

The SuperTIGER (Trans-Iron Galactic Element Recorder) experiment was launched on a long-duration balloon flight from Williams Field, Antarctica, on December 8, 2012. SuperTIGER flew for a total of 55 days at a mean atmospheric depth of 4.4 g/cm^2. The instrument measured the abundances of galactic c...

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Bibliographic Details
Main Authors: Murphy, R. P., Binns, W. R., Bose, R. G., Brandt, T. J., Dowkontt, P. F., Hams, T., Israel, M. H., Labrador, A. W., Link, J. T., Mewaldt, R. A., Mitchell, J. W., Rauch, B. F., Sakai, K., Sasaki, M., Stone, E. C., Waddington, C. J., Ward, J. E., Wiedenbeck, M. E.
Format: Book Part
Language:English
Published: SISSA 2015
Subjects:
Online Access:https://authors.library.caltech.edu/89244/
https://authors.library.caltech.edu/89244/1/ICRC2015_438.pdf
https://resolver.caltech.edu/CaltechAUTHORS:20180828-122926089
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Summary:The SuperTIGER (Trans-Iron Galactic Element Recorder) experiment was launched on a long-duration balloon flight from Williams Field, Antarctica, on December 8, 2012. SuperTIGER flew for a total of 55 days at a mean atmospheric depth of 4.4 g/cm^2. The instrument measured the abundances of galactic cosmic rays in the charge (Z) range Z ≥ 10 with excellent charge resolution, displaying well resolved individual element peaks for 10 ≤ Z ≤ 40. SuperTIGER collected ∼ 3.95 × 10^6 Iron nuclei, ∼ 7.1 times as many as detected by TIGER. We will present details of the data analysis techniques and the elemental abundances in the range 30 ≤ Z ≤ 40. The data presented contain more than 600 events in this charge range, with charge resolution at _(26)Fe of < 0.18 cu. Our measured abundances are generally consistent with those measured by TIGER and ACE. Our results confirm the earlier results from TIGER, supporting a model of cosmic-ray origin in OB associations, with preferential acceleration of refractory elements over volatile elements.