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

Murphy, R. P. and Binns, W. R. and Bose, R. G. and Brandt, T. J. and Dowkontt, P. F. and Hams, T. and Israel, M. H. and Labrador, A. W. and Link, J. T. and Mewaldt, R. A. and Mitchell, J. W. and Rauch, B. F. and Sakai, K. and Sasaki, M. and Stone, E. C. and Waddington, C. J. and Ward, J. E. and Wiedenbeck, M. E. (2015) Abundances of Ultra-Heavy Galactic Cosmic Rays from the SuperTIGER Instrument. In: 34th International Cosmic Ray Conference. Proceedings of Science. No.236. SISSA , Trieste, Italy, Art. No. 438.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Brandt, T. J.0000-0003-4087-1786
Israel, M. H.0000-0002-8104-208X
Labrador, A. W.0000-0001-9178-5349
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. This research was supported by NASA under grants NNX09AC17G, NNX14AB25G, the Peggy and Steve Fossett Foundation, and the McDonnell Center for the Space Sciences at Washington University in St. Louis. We thank the NASA Columbia Scientific Balloon Facility, the NASA Balloon Program Office, and the NSF United States Antarctic Program for the excellent and highly professional efforts that resulted in the record long-duration balloon flight and recovery for SuperTIGER.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Peggy and Steve Fossett FoundationUNSPECIFIED
McDonnell Center for the Space SciencesUNSPECIFIED
Series Name:Proceedings of Science
Issue or Number:236
Record Number:CaltechAUTHORS:20180828-122926089
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89244
Deposited By: George Porter
Deposited On:30 Aug 2018 20:29
Last Modified:16 Nov 2021 00:33

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