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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 http://resolver.caltech.edu/CaltechAUTHORS:20111116-133416059

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Abstract

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
http://dx.doi.org/10.1063/1.1434008DOIUNSPECIFIED
http://link.aip.org/link/?APCPCS/598/257/1PublisherUNSPECIFIED
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
Funders:
Funding AgencyGrant Number
NASA Washington UniversityUNSPECIFIED
NASANAG5-6912
JPLUNSPECIFIED
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:galactic cosmic rays, cosmic ray composition, neon, isotope relative abundance, stellar models, Wolf-Rayet stars, meteorites
Classification Code:PACS: 98.70.Sa; 96.35.Er; 97.10.Cv; 97.30.Eh
Record Number:CaltechAUTHORS:20111116-133416059
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20111116-133416059
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
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:16 Nov 2011 22:02
Last Modified:26 Dec 2012 14:25

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