Is there a dynamic effect in the screening of nuclear reactions in stellar plasmas?

Details Is there a dynamic effect in the screening of nuclear reactions in stellar plasmas? Is there a dynamic effect in the screening of nuclear reactions in stellar plasmas?

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phr...311...99s&link_type=abstract

Physics Reports, Vol. 311, No. 3 - 5, p. 99 - 114

Physics

14

Plasma: Nuclear Reactions, Plasma: Stars

Scientific paper

The authors investigate the following two questions of principle: (I) does the ion's kinetic energy affect its electrostatic potential energy when the ion is in statistical equilibrium with the plasma? In other words, is there a difference between the potential energy of a test particle moving in the plasma and the potential energy of a particle in statistical equilibrium with the plasma? (II) Does the effect of the plasma on the rate of the nuclear reaction depend on kinetic energy? The two issues are important for evaluating the plasma effect on nuclear reactions in astrophysical plasmas. The first effect was calculated by Carraro et al. (1988) and found to be significant. However, criticism by several authors (Brown and Sawyer, 1997; Weneser, 1996; Gruzinov, 1997) claim that there is no such effect. The present authors examine the relevant statistical mechanics assumptions and in the absence of a complete rigorous proof check them numerically. They find that the potential energy per particle for particles which are in statistical equilibrium is indeed independent of the potential energy of the particle at least for particles with kinetic energy up to 10 kT. The second question has to do with the kinetics of the collision between two particles in the presence of ambient plasma particles. They discuss this point and obtain the kinetic energy dependence of this interaction and relate it to the so-called 'screening effect'.

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