Interaction during face to face collision between nonlinear electron acoustic solitary waves in quantum plasma

The face to face collision between two nonlinear electron acoustic solitary waves in quantum plasma is studied. Using the extended Poincare–Lighthill–Kuo method we obtain the Korteweg-de Vries equations, the phase shifts and the trajectories after face to face interaction of the two solitons. The effect of the number densities of cold and hot electrons on the two phase shifts are also investigated. Moreover, it is observed that the quantum parameters for the different ratios of cold to hot electron number densities and also the ratios of cold to hot electron number densities for the different quantum parameters affect the phase shifts significantly. (author)