1997
DOI: 10.1016/s0370-2693(97)00135-4
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Long-range correlations in finite nuclei: comparison of two self-consistent treatments

Abstract: Long-range correlations, which are partially responsible for the observed fragmentation and depletion of low-lying single-particle strength, are studied in the Green's function formalism. The self-energy is expanded up to second order in the residual interaction. We compare two methods of implementing self-consistency in the solution of the Dyson equation beyond Hartree-Fock, for the case of the 16 O nucleus. It is found that the energy-bin method and the BAGEL method lead to globally equivalent results. In bo… Show more

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Cited by 16 publications
(13 citation statements)
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“…This exponential growth of the number of poles seems to prevent the achievement of convergence in an actual calculation. In practice, one limits the growth of the number of poles by Krylov projection techniques [60,61], as discussed in Paper II, while ensuring the convergence of the calculation.…”
Section: E Energy-independent Eigenvalue Problemmentioning
confidence: 99%
“…This exponential growth of the number of poles seems to prevent the achievement of convergence in an actual calculation. In practice, one limits the growth of the number of poles by Krylov projection techniques [60,61], as discussed in Paper II, while ensuring the convergence of the calculation.…”
Section: E Energy-independent Eigenvalue Problemmentioning
confidence: 99%
“…For this to be possible a method must be devised to handle the continuous variables that are characteristic to this sort of systems. Their are two possible paths that were previously applied to nuclear matter [DNDW97], the BIN [NWR91,NWdSH93] and BAGEL [MTK88,MS93b] methods. In the BIN method, the energy axis is discretized and all quantities of interest are represented in these equidistant energy bins.…”
Section: Discussionmentioning
confidence: 99%
“…One disadvantage of the energy-independent formulation is that the number of energy poles, i.e., the eigenvalues and the dimensionality of the energy-independent Dyson or Gorkov matrix, increases at each self-consistent iteration. In practice, this growth is reduced via the application of Krylov projection techniques [76,77], typically implemented by means of a Lanczos algorithm (see [32] for a detailed discussion and a numerical study).…”
Section: Working Equationsmentioning
confidence: 99%