Walsh, Nathan Elliot and Akaike, Yosui and Binns, Walter Robert and Bose, Richard G. and Brandt, Terri J. and Braun, Dana L. and Cannady, Nicholas W. and Dowkontt, Paul F. and Hams, Thomas and Israel, Martin H. and Krizmanic, John F. and Labrador, Allan W. and Mewaldt, Richard A. and Mitchell, John W. and Murphy, Ryan P. and de Nolfo, Georgia A. and Nutter, Scott and Olevitch, Martin A. and Rauch, Brian. F. and Sakai, Kenichi and Sasaki, Makoto and Simburger, Garry E. and Stone, Ed C. and Tatoli, Teresa and Ward, John Ennis and Wiedenbeck, Mark E. and Zober, Wolfgang V. (2022) SuperTIGER instrument abundances of galactic cosmic rays for the charge interval 41 ⩽ Z ⩽ 56. Advances in Space Research, 70 (9). pp. 2666-2673. ISSN 0273-1177. doi:10.1016/j.asr.2022.04.063. https://resolver.caltech.edu/CaltechAUTHORS:20221121-712406200.18
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Abstract
We report preliminary elemental abundance results from the 55-day long-duration-balloon flight of SuperTIGER (Super Trans-Iron Galactic Element Recorder) during the 2012–2013 austral summer. SuperTIGER measured the relative abundances of Galactic cosmic-ray (GCR) nuclei with high statistical precision and well resolved individual element peaks from ₁₀Ne to ₄₀Zr. SuperTIGER also made exploratory measurements of the relative abundances up to 56Ba. Although the statistics are low for elements heavier than ₄₀Zr, we present, for the first time, relative abundance measurements of charges Z = 41 - 56 with individual element resolution. GCR measurements up to ₄₀Zr support a source acceleration model where supernovae in OB associations preferentially accelerate refractory elements that are more readily embedded in interstellar dust grains than volatiles. In addition, injection into the GCR for both refractory and volatile elements appears to follow a charge dependence consistent with their grain sputtering cross sections. By extending the GCR measurement range past ₄₀Zr, we can begin to further constrain these models.
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| Additional Information: | This research was supported by NASA under grants NNX09AC17G, NNX14AB25G, NNX15AC23G and 80NSSC20K0405, by the McDonnell Center for the Space Sciences at Washington University, and by the Peggy and Steve Fossett Foundation. 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 two successful long-duration balloon flights for SuperTIGER. | ||||||||||||||||||||||||||||
| Group: | Space Radiation Laboratory, Astronomy Department | ||||||||||||||||||||||||||||
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| Issue or Number: | 9 | ||||||||||||||||||||||||||||
| DOI: | 10.1016/j.asr.2022.04.063 | ||||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20221121-712406200.18 | ||||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20221121-712406200.18 | ||||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||||
| ID Code: | 117953 | ||||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||
| Deposited By: | Research Services Depository | ||||||||||||||||||||||||||||
| Deposited On: | 02 Dec 2022 00:25 | ||||||||||||||||||||||||||||
| Last Modified: | 02 Dec 2022 18:15 |
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