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We study, theoretically and experimentally, the nonlinear dynamics of a wave packet launched inside a trap potential. Increasing the power of the wave packet transforms its dynamics from linear tunneling through a potential barrier, to soliton tunneling, and eventually, above a well-defined threshold, to the ejection of a soliton from the potential trap.doi:10.1103/physrevlett.100.153901 pmid:18518107 fatcat:hy4673gzsfgj5gyx2ngntts4ny