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PHYSICS LETTERS A
Volume 374, Issue 2, Pages 290-293Publisher
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DOI: 10.1016/j.physleta.2009.10.060
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Head-on collision between two ion acoustic solitary waves in a Thomas-Fermi plasma containing degenerate electrons and positrons is investigated using the extended Poincare-Lighthill-Kuo (PLK) method. The results show that the phase shifts due to the collision are strongly dependent on the positron-to-electron number density ratio, the electron-to-positron Fermi temperature ratio and the ion-to-electron Fermi temperature ratio. The present study might be helpful to understand the excitation of nonlinear ion-acoustic solitary waves in a degenerate plasma such as in superdense white dwarfs. (C) 2009 Elsevier B.V. All rights reserved.
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