Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrve..82f6401h&link_type=abstract
Physical Review E, vol. 82, Issue 6, id. 066401
Physics
Plasma Physics
6
Space Plasma Physics, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Late Stages Of Stellar Evolution, Diffusion And Thermal Diffusion
Scientific paper
Sedimentation of the neutron rich isotope N22e may be an important source of gravitational energy during the cooling of white dwarf stars. This depends on the diffusion constant for N22e in strongly coupled plasma mixtures. We calculate self-diffusion constants Di from molecular dynamics simulations of carbon, oxygen, and neon mixtures. We find that Di in a mixture does not differ greatly from earlier one component plasma results. For strong coupling (coulomb parameter Γ> few), Di has a modest dependence on the charge Zi of the ion species, Di∝Zi-2/3 . However, Di depends more strongly on Zi for weak coupling (smaller Γ ). We conclude that the self-diffusion constant DNe for N22e in carbon, oxygen, and neon plasma mixtures is accurately known so that uncertainties in DNe should be unimportant for simulations of white dwarf cooling.
Berry Donald K.
Horowitz Charles J.
Hughto Joseph
Schneider A. S.
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