Corrections to linear mixing in binary ionic mixtures and plasma screening at zero separation

Details Corrections to linear mixing in binary ionic mixtures and plasma screening at zero separation Corrections to linear mixing in binary ionic mixtures and plasma screening at zero separation

2009-11-23

arxiv.org/abs/0911.4354v1

Contrib. Plasma Phys, 49 (2009), 696

Physics

Plasma Physics

4 pages, 2 figures, pre-peer reviewed version of the article accepted for publication in Contrib. Plasma Phys. (2009). The res

Scientific paper

10.1002/ctpp.200910079

Using the results of extensive Monte Carlo simulations we discuss corrections to the linear mixing rule in strongly coupled binary ionic mixtures. We analyze the plasma screening function at zero separation, H_{jk}(0), for two ions (of types j=1,2 and k=1,2) in a strongly coupled binary mixture. The function H_{jk}(0) is estimated by two methods: (1) from the difference of Helmholtz Coulomb free energies at large and zero separations; (2) by fitting the Widom expansion of H_{jk}(x) in powers of interionic distance x to Monte Carlo data on the radial pair distribution function g_{jk}(x). These methods are shown to be in good agreement. For illustration, we analyze the plasma screening enhancement of nuclear burning rates in dense stellar matter.

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