Microscopic analysis of two-body correlations in light nuclei

Details Microscopic analysis of two-body correlations in light nuclei Microscopic analysis of two-body correlations in light nuclei

1993-11-25

arxiv.org/abs/nucl-th/9311031v1

Nucl.Phys. A573 (1994) 93-129

Physics

Nuclear Physics

Nuclear Theory

31 LATEX pages, 18 figures available upon request, UGI-93-10

Scientific paper

10.1016/0375-9474(94)90016-7

Within a nonperturbative dynamical two-body approach - based on coupled equations of motion for the one-body density matrix and the two-body correlation function - we study the distribution of occupation numbers in a correlated system close to the groundstate, the relaxation of single-particle excitations and the damping of collective modes. For this purpose the nonlinear equations of motion are solved numerically within a finite oscillator basis for the first time adopting short-range repulsive and long-range attractive two-body forces. We find in all cases that the formation of long- and short-range correlations and their mixing is related to the long- and short-range part of the nucleon-nucleon interaction which dominate the resummation of loop or ladder diagrams, respectively. However, the proper description of relaxation or damping phenomena is found to require both types of diagrams as well as the mixed terms simultaneously.

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