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We present a method for calculating scattering phase shifts which utilizescontinuum-discretized states obtained in a bound-state type calculation. Thewrong asymptotic behavior of the discretized state is remedied by means of theGreen's function formalism. Test examples confirm the accuracy of the method.The $\alpha+n$ scattering is described using realistic nucleon-nucleonpotentials. The $3/2^-$ and $1/2^-$ phase shifts obtained in a single-channelcalculation are too small in comparison with experiment. The $1/2^+$ phaseshifts are in reasonable agreement with experiment, and gain contributions bothfrom the tensor and central components of the nucleon-nucleon potential.

Phase-shift calculation using continuum-discretized states