Vibrations versus collisions and the iterative structure of two-body dynamics

Details Vibrations versus collisions and the iterative structure of two-body dynamics Vibrations versus collisions and the iterative structure of two-body dynamics

1994-04-18

arxiv.org/abs/nucl-th/9404020v1

Physics

Nuclear Physics

Nuclear Theory

24 LATEX pages, 8 figures available upon request,UGI-94-03

Scientific paper

10.1016/0375-9474(94)90943-1

We adopt a truncated version of two-body dynamics by neglecting three-body correlations, as is supported by microscopic numerical calculations. Introducing orthogonal channel correlations for the pp- and the ph-channel and integrating the latter in terms of vibrational RPA-states we derive a retarded two-body equation. Its solution is nonperturbative with respect to loops, ladders and mixed contributions. In the stationary limit we obtain an equation for a generalised effective interaction which iterates both the G-matrix and the polarisation matrix. An in-medium scattering approach transparently demonstrates the collisional damping of the vibrations.

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