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Electron-acoustic solitary excitations; quantum degeneracy; quantum hydrodynamics; oblique collision; phase-shift

Oblique interaction of small- but finite-amplitude KdV-type electron-acoustic solitary excitations is examined in an unmagnetized two-electron-populated degenerate quantum electron–ion plasma in the framework of quantum hydrodynamics model using the extended Poincaré–Lighthill–Kuo (PLK) perturbation method. Critical plasma parameter is found to distinguish the types of solitons and their interaction phase-shifts. It is shown that, depending on the critical quantum diffraction parameter $H_{cr}$, both compressive and rarefactive solitary excitations may exist in this plasma and their collision phase-shifts can be either positive or negative for the whole range of collision angles $0 < θ < π$.

M Akbari-Moghanjoughi¹ N Ahmadzadeh-Khosroshahi²

1. Faculty of Science, Department of Physics, Azarbaijan University of Tarbiat Moallem, 51745-406, Tabriz, Iran
2. Islamic Azad University, Hadishahr Branch, Hadishahr, Iran

Published

August 2011

Manuscript received

3 September 2010

Manuscript revised

17 January 2011

Accepted

9 February 2011