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Elemental Abundances of Ultra-Heavy GCRs measured by SuperTIGER and ACE-CRIS and the Origin of Galactic Cosmic Rays

Hams, T. and Binns, W. R. and Brandt, T. J. and Christian, E. R. and Cummings, A. C. and de Nolfo, G. A. and Dowkontt, P. F. and Israel, M. H. and Krizmanic, J. F. and Labrador, A. W. and Leske, R. A. and Link, J. T. and Mewaldt, R. A. and Mitchell, J. W. and Murphy, R. P. and Rauch, B. F. and Sakai, K. and Sasaki, M. and Stone, E. C. and von Rosenvinge, T. T. and Waddington, C. J. and Ward, J. E. and Westphal, A. J. and Wiedenbeck, M. E. (2015) Elemental Abundances of Ultra-Heavy GCRs measured by SuperTIGER and ACE-CRIS and the Origin of Galactic Cosmic Rays. In: 34th International Cosmic Ray Conference (ICRC2015). Proceedings of Science. No.236. SISSA , Trieste, Italy, Art. No. 038.

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The Super Trans-Iron Galactic Element Recorder (SuperTIGER) long-duration balloon instrument and the Cosmic Ray Isotope Spectrometer (CRIS) on the NASA Advanced Composition Explorer (ACE) satellite have measured the abundances of galactic cosmic-ray elements from _(10)Ne to _(40)Zr with high statistics and single-element resolution. SuperTIGER launched from Williams Field, McMurdo Station, Antarctica, on December 8, 2012, flying for a record 55 days. During that flight we detected ∼1,300 nuclei with atomic number Z ≥ 30. The resolution in charge (Z) of SuperTIGER is excellent, with σ_Z ≈ 0.16 c.u. at _(26)Fe. SuperTIGER is sensitive to nuclei with energy at the top of the atmosphere of E > 0.8 GeV/nucleon. The instrument has now been recovered and preparations are underway for its next flight. ACE/CRIS has been taking data in space for more than 17 years since launch in 1997, has collected ∼625 nuclei with atomic number Z ≥ 30, and shows excellent resolution with clear separation between the charges for 30 ≤ Z ≤ 40. ACE/CRIS is sensitive to nuclei in the energy range 150 ≤ E ≤ 600 MeV/nucleon. Preliminary results from the balloon-borne SuperTIGER show good agreement with ACE measurements in space, validating our corrections to SuperTIGER abundances for nuclear interactions in the atmosphere. The results from these experiments will be discussed in the context of the OB association model for the origin of galactic cosmic rays. Future missions to measure elemental abundances to higher Z, the SuperTIGER-II LDB instrument and the orbiting Heavy Nuclei eXplorer (HNX) mission, will also be discussed.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Brandt, T. J.0000-0003-4087-1786
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
de Nolfo, G. A.0000-0002-3677-074X
Israel, M. H.0000-0002-8104-208X
Labrador, A. W.0000-0001-9178-5349
Leske, R. A.0000-0002-0156-2414
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. SuperTIGER is supported by NASA under the ROSES 2007 APRA program under grants NNX09AC17G to Washington University in St. Louis and NNX09AC18G to Caltech and JPL, and APRA07-0146 to NASA/GSFC. We wish to thank the Columbia Scientific Balloon Facility (CSBF) personnel and the Wallops Balloon Program Office (BPO) for their excellent efforts that resulted in our highly successful long-duration balloon flight. We also wish to thank the National Science Foundation Office of Polar Programs for their outstanding logistical support which made this investigation possible. The ACE data analysis is supported by NASA Grant NNX13AH66G.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Series Name:Proceedings of Science
Issue or Number:236
Record Number:CaltechAUTHORS:20180910-131321786
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89498
Deposited By: George Porter
Deposited On:10 Sep 2018 21:07
Last Modified:16 Nov 2021 00:35

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