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It is reported that the phase time of particles which are reflected by aone-dimensional semi-harmonic well includes a time delay term which is negativefor definite intervals of the incoming energy. In this interval, the absolutevalue of the negative time delay becomes larger as the incident energy becomessmaller. The model is a rectangular well with zero potential energy at itsright and a harmonic-like interaction at its left.

Negative time delay for wave reflection from a one-dimensional semi-harmonic well