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The electron-positron pair production in the collision of two intense gammalasers is studied beyond the dipole approximation. The completeelectron/positron momentum spectrum obtained by three-dimensional computationshows directly the multi-photon pair production channels and provides asensitive test on the widely-used concept of the effective mass.Nonperturbative features are identified in the dependence of the total yield onthe field intensity. In particular, various breaks in the momentum rings areobserved and proved to be a manifestation of particle's energy gaps in thestanding light wave induced by the Kapitza-Dirac scattering. A theoreticalmodel of multi-level systems coupled by the Kapitza-Dirac scattering and pairproduction channels is established. Multi-channel interference effects and pairproduction suppression are revealed in these systems.

Multi-channel Interference in Nonperturbative Multiphoton Pair Production by Gamma Rays Colliding