Results are reported for the numerical simulation of the scattering between a soliton-antisoliton pair for the double-Sine-Gordon equation. The final states of scattering as a function of initial energy can be the formation of a bound state (Breather mode), hard-core repulsion or particle conversion. A speculation about the occurrence of multi-particle production in the final state is also discussed.
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Shiefman et al. (1979) studied this question.