Influence of the nonthermal plasma shielding on the ion collisions in Lorentzian semiclassical plasmas

Abstract

The influence of the nonthermal plasma shielding on the elastic ion-ion collision is investigated in dense Lorentzian semiclassical plasmas. The effective interaction potential and phase theory are applied to obtain the scattering phase shift and collision cross section as functions of the spectral index of the Lorentzian plasma, impact parameter, collision energy, and plasma parameters. The result shows that the nonthermal plasma shielding effect reduces the magnitude of the scattering phase shift. It is also found that the nonthermal plasma shielding effect suppresses the ion-ion collision cross section. Hence, we have found that the ion-ion collision cross sections in thermal plasmas are always greater than those in nonthermal plasmas. In addition, it is found that the nonthermal shielding effect on the collision cross section increases with an increase of the Debye length in Lorentzian semiclassical plasmas. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4728066]