Antikink-kink ( KK) collisions in the φ 6 model exhibit resonant scattering although the φ 6 kinks do not support any bound states to which energy could be transferred. In Phys. Rev. Lett. 107 (2011) 091602 it was conjectured that, instead, energy is transferred to a collective bound mode of the full KK configuration. Here we present further strong evidence for this conjecture.Further, we construct a collective coordinate model (CCM) for KK scattering based on this collective bound mode trapped between the KK pair which allows us to reproduce the full dynamics of KK scattering with striking accuracy. We also study kink-antikink (K K) scattering and its description by a CCM. In this case a significant role of radiation is discovered.
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