The R-matrix formalism is applied to the study of resonance properties. We present an iterative method that provides the energy and width of a resonance without the usual Breit-Wigner parametrization. The validity of the method is checked on a microscopic study of ¹³C{+}¹³$C scattering at low energies, and on the hydrogen atom in a strong magnetic field. For this latter system, the method is also applied to the study of two-channel resonances.
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Descouvemont et al. (1990) studied this question.
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