Pion-Nucleus Interactions in the Resonance Region
Two aspects of pion-nucleus interactions and photopion reactions in the resonance region will be discussed. The first is essentailly the theory of the pion optical potential. Obviously, we need the optical potential in order to calculate any coherent process (one in which the residual nucleus is in a definite quantum state) such as elastic pion scattering, coherent π° photoproduction, analog state charge exchange, etc. Most theoretical work up to now has focussed on developing the optical potential. The second aspect involves an understanding of pion reaction mechanisms. Important questions here involve the nuclear response function for pion scattering, the means of energy transfer between the pion and nucleus, and the role of pion absorption. Typically these questions are studied experimentally in various types of inclusive reactions and theoretically are mostly ignored. Yet our understanding of these reaction mechanisms is crucial to our construction of the optical potential.
KeywordsPartial Wave Absorption Cross Section Resonance Region Inelastic Cross Section Elastic Channel
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