Abstract
Abstract The two-particle random phase approximation (RPA), frequently used to describe pairing modes in bound state problems, is extended to include configurations with one particle in the continuum. We consider the scattering of a nucleon from a target nucleus consisting of a correlated doubly closed shell core plus one particle, and derive the S-matrix for this process. The analytic properties of the particle-particle RPA are compared to those previously obtained for the particle-hole case.
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