Low energy cross sections from the collision of nucleons with light mass nuclei show sharp as well as broad resonances upon a smooth, energy dependent background. Those resonances may correlate to states in the discrete spectrum of the target. To interpret scattering data of that type requires a complex coupled channel reaction theory. A suitable and convenient theory has been developed and forms the MCAS; a Multi-Channel Algebraic Scattering theory. With MCAS, scattering matrices are determined by using sturmian-state expansions of the relevant nucleon-nucleus potential matrix. MCAS yields a matrix form of the Green function for scattering from which extraction of the sub-threshold (compound nucleus) bound-state spin-parity values and energies is facile. The procedure also gives the energies and widths of resonances in the scattering regime. Applications for both proton and neutron scattering form 12C are presented.
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