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Constraints on Galactic Cosmic-Ray Origins from Elemental and Isotopic Composition MeasurementsThe most recent measurements by the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE) satellite of ultra-heavy cosmic ray isotopic and elemental abundances will be presented. A range of isotope and element ratios, most importantly Ne-22/Ne-20, Fe-58/Fe-56, and Ga-31/Ge -32 show that the composition is consistent with source material that is a mix of approx 80% ISM (with Solar System abundances) and 20% outflow/ejecta from massive stars. In addition, our data show that the ordering of refractory and volatile elements with atomic mass is greatly improved when compared to an approx 80%/20% mix rather than pure ISM, that the refractory and volatile elements have similar slopes, and that refractory elements are preferentially accelerated by a factor of approx 4. We conclude that these data are consistent with an OB association origin of GCRs.
Document ID
20140009149
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Binns, W. R.
(Washington Univ. Saint Louis, MO, United States)
Christian, E. R.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Cummings, A. C.
(California Inst. of Tech. Pasadena, CA, United States)
deNolfo, G. A.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Israel, M. H.
(Washington Univ. Saint Louis, MO, United States)
Leske, R. A.
(California Inst. of Tech. Pasadena, CA, United States)
Mewaldt, R. A,
(California Inst. of Tech. Pasadena, CA, United States)
Stone, E. C.
(California Inst. of Tech. Pasadena, CA, United States)
vonRosevinge, T. T.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Wiedenbeck, M. E.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
July 14, 2014
Publication Date
July 2, 2013
Subject Category
Space Radiation
Report/Patent Number
GSFC-E-DAA-TN10609
Meeting Information
Meeting: International Cosmic Ray Conference
Location: Rio de Janeiro
Country: Brazil
Start Date: July 2, 2013
End Date: July 9, 2013
Sponsors: International Union of Pure and Applied Physics
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Galactic Cosmic Rays
GCR Composition
GCR Origin
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