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Elemental Source Composition Measurements and the Origin of Galactic Cosmic Rays

Binns, W. R. and Israel, M. H. and Wiedenbeck, M. E. and Cummings, A. C. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and Christian, E. R. and de Nolfo, G. A. and von Rosenvinge, T. T. (2019) Elemental Source Composition Measurements and the Origin of Galactic Cosmic Rays. In: 36th International Cosmic Ray Conference (ICRC2019). Proceedings of Science. No.358. SISSA , Trieste, Italy, Art. No 36.

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We present measurements of the elemental abundances of ultra-heavy (Z>29) cosmic rays made by the CRIS instrument on NASA’s ACE satellite. The data set corresponds to 7406 days of data collection from December 4, 1997 through Feb. 18, 2019. We detected a total of 1205 ultra-heavy nuclei in the charge range of Z=30-40. The charge resolution that we obtain shows essentially complete separation of the elements over this charge range. We derive preliminary source abundances from these measurements. These source abundances show that the ordering of refractory and volatile elements with atomic mass is greatly improved when compared to a mix of massive star outflow plus SN ejecta with normal ISM, rather than with only normal ISM. Additionally, in this ordering the refractory and volatile elements have similar slopes and refractory elements are preferentially accelerated by a factor of ~4. The measured abundances support a model in which cosmic ray source material is a mix of massive star outflow plus supernova ejecta and normal ISM, consistent with conclusions reached from the SuperTIGER high-altitude balloon measurements.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Israel, M. H.0000-0002-8104-208X
Wiedenbeck, M. E.0000-0002-2825-3128
Cummings, A. C.0000-0002-3840-7696
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Christian, E. R.0000-0003-2134-3937
de Nolfo, G. A.0000-0002-3677-074X
Additional Information:© 2019 owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Pre-published on: 2019 July 22. This research is supported by NASA under Grant #80NSSC18K0223.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Series Name:Proceedings of Science
Issue or Number:358
Record Number:CaltechAUTHORS:20190729-091757335
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97479
Deposited By: Joy Painter
Deposited On:29 Jul 2019 16:39
Last Modified:20 Feb 2020 14:33

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