A pion-nucleus optical potential containing effects of genuine pion absorption and emission |
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Authors: | AS Rinat |
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Institution: | Department of Nuclear Physics, Weizmann Institute of Science, Rehovot, Israel |
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Abstract: | We derive in two ways a lowest-order optical potential πA using the projectile and a pair of target nucleons as the basic interacting unit. The first derivation—a heuristic one—uses a multiple-scattering theory, while the second employs a field theory where pions can be absorbed and emitted as well as scattered. The lowest-order terms of πA contain the two-particle ground state density and the πNN → πNN scattering matrix. In the same field-theoretical model one analyzes the latter in standard multiple-scattering contributions and genuine absorption corrections. The form of these corrections and their relation to often ad hoc assumed forms is discussed. |
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