Anomalous behavior of the coefficient of normal restitution in oblique impact.

@article{Kuninaka2004AnomalousBO,
  title={Anomalous behavior of the coefficient of normal restitution in oblique impact.},
  author={Hiroto Kuninaka and Hisao Hayakawa},
  journal={Physical review letters},
  year={2004},
  volume={93 15},
  pages={
          154301
        }
}
The coefficient of normal restitution in an oblique impact is theoretically studied. Using a two-dimensional lattice model for an elastic disk and an elastic wall, we demonstrate that the coefficient of normal restitution can exceed unity and has a peak against the incident angle in our simulation. We also explain this behavior based upon a phenomenological theory. 

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