Characterizing quasibound states and scattering resonances

@article{Frye2020CharacterizingQS,
  title={Characterizing quasibound states and scattering resonances},
  author={Matthew D. Frye and Jeremy M. Hutson},
  journal={Physical Review Research},
  year={2020}
}
Characterizing quasibound states from coupled-channel scattering calculations can be a laborious task, involving extensive manual iteration and fitting. We present an automated procedure, based on the phase shift or S-matrix eigenphase sum, that reliably converges on a quasibound state (or scattering resonance) from some distance away. It may be used for both single-channel and multichannel scattering. It produces the energy and width of the state and the phase shift of the background… 

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