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GCR Neon Isotopic Abundances: Comparison with Wolf-Rayet Star Models and Meteoritic Abundances

Binns, W. R. and Wiedenbeck, M. E. and Christian, E. R. and Cummings, A. C. and George, J. S. and Israel, M. H. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. and Yanasak, N. E. (2001) GCR Neon Isotopic Abundances: Comparison with Wolf-Rayet Star Models and Meteoritic Abundances. In: Solar and Galatic Composition. AIP Conference Proceedings. No.598. American Institute of Physics , Melville, N.Y., pp. 257-262. ISBN 0-7354-0042-3.

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Measurements of the neon isotopic abundances from the ACE-CRIS experiment are presented. These abundances have been obtained in seven energy intervals over the energy range of ~80≤E≤280 MeV/nucleon. The ^(22)Ne/^(20)Ne source ratio is derived using the measured ^(21)Ne/^(20)Ne abundance as a "tracer" of secondary production of the neon isotopes. We find that the ^(22)Ne/^(20)Ne abundance ratio at the cosmic-ray source is a factor of 5.0±0.2 greater than in the solar wind. The GCR ^(22)Ne/^(20)Ne ratio is also shown to be considerably larger than that found in anomalous cosmic rays, solar energetic particles, most meteoritic samples of matter, and interplanetary dust particles. Recent two-component Wolf-Rayet models provide predictions for the ^(22)Ne/^(20)Ne ratio and other isotope ratios. Comparison of the CRIS neon, iron, and nickel isotopic source abundance ratios with predictions indicate possible enhanced abundances of some neutron-rich nuclides that are expected to accompany the ^(22)Ne excess.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Wiedenbeck, M. E.0000-0002-2825-3128
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
Israel, M. H.0000-0002-8104-208X
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2001 American Institute of Physics. Issue Date: 21 November 2001. This research was supported by the National Aeronautics and Space Administration at Washington University, the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center. It was also supported by the McDonnell Center for the Space Sciences at Washington University.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Washington University McDonnell Center for the Space SciencesUNSPECIFIED
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:galactic cosmic rays, cosmic ray composition, neon, isotope relative abundance, stellar models, Wolf-Rayet stars, meteorites
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-60
Series Name:AIP Conference Proceedings
Issue or Number:598
Classification Code:PACS: 98.70.Sa; 96.35.Er; 97.10.Cv; 97.30.Eh
Record Number:CaltechAUTHORS:20111116-133416059
Persistent URL:
Official Citation:GCR neon isotopic abundances: Comparison with wolf-rayet star models and meteoritic abundances W. R. Binns, M. E. Wiedenbeck, E. R. Christian, A. C. Cummings, J. S. George, M. H. Israel, R. A. Leske, R. A. Mewaldt, E. C. Stone, T. T. von Rosenvinge, and N. E. Yanasak, AIP Conf. Proc. 598, 257 (2001), DOI:10.1063/1.1434008
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27814
Deposited By: Ruth Sustaita
Deposited On:16 Nov 2011 22:02
Last Modified:09 Nov 2021 16:52

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