Abstract
The inverse scattering formalism is applied to the case of the pion-helium system to obtain the real and imaginary parts of a local phenomenological potential from ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{-}}}^{4}$He partial wave phase shifts at a fixed energy. The phase shifts and inelasticities for all partial waves up to angular momentum l=9 are extracted from the differential cross-section data by parametrizing the nuclear amplitude. The method has been tried for a number of incident pion energies between 51 and 110 MeV. The real and imaginary parts of the potential are seen to compare well with the commonly used pion-nucleus Laplacian potential.
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