Oblique propagation and head-on collisions of solitary structures is studiedin a dense magnetized plasma comprised of relativistic ultra-cold electrons andpositrons and positive dynamic ions using conventional extended multi-scalestechnique, in the ground of quantum hydrodynamics model. The variations ofhead-on collision phase-shift as well as the characteristic soliton amplitudeand width is evaluated numerically in terms of other plasma parameters such asmass-density, normalized magnetic field strength, its angle with respect to thesoliton propagation and the relative positron number-density. The relevance ofcurrent investigations, with appropriate plasma parameters for theastrophysical dense magnetized objects such as white-dwarfs, is addressed.
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