A New Development at the Intersection of Nuclear Structure and Reaction Theory This book highlights a major advance in low energy scattering theory: the Multi Channel Algebraic Scattering (MCAS) theory which represents an attempt to unify structure and reaction theory. It solves the Lippmann–Schwinger equations for low energy nucleon nucleus and alpha nucleus scattering in momentum space allowing both the bound and scattering states in the compound nucleus formed to be described. Results of various cases are presented and discussed Introduction Fundamental Considerations Facets of Nuclear Structure Facets of Nuclear Reactions NA Scattering theory at intermediate energy NA Scattering theory at low energy Electron scattering Multi Channel Algebraic Scattering Theory Results for light nuclei to be discussed Results for exotic nuclei New Physics Concluding remarks