Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1993-06-23
Nucl.Phys. A567 (1994) 576-590
Physics
Nuclear Physics
Nuclear Theory
Latex, 23 pages, 4 figures (postscript, available from authors), Minnesota preprint NUC-MINN-93/11-T
Scientific paper
10.1016/0375-9474(94)90025-6
We generalize the Lee-Suzuki iteration method for summing the folded diagram series to the case where the unperturbed model-space energies are non-degenerate. A condition is derived for the convergence of the iteration scheme and this depends on the choice of the model space projection operators. Two choices are examined, in the first the projection operators are defined in terms of the unperturbed states and in the second they are defined in terms of the eigenfunctions obtained at each stage of the iteration. As is illustrated by calculations with a simple model, the second procedure gives the better convergence and, by suitable choice of the starting energies, allows the reproduction of any subset of the exact eigenvalues.
Ellis Paul J.
Kuo Thomas T. S.
Okamoto Ryo
Suzuki Kaori
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