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Carlo Barbieri

TRIUMF
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Nuclear correlations at low energy using self consistent Green’s functions

A recent application of the self-consistent Green's function method
has focused on long-range correlations in O-16. The approach employs a
nonperturbative expansion of the many-body self-energy in which
quasiparticles/quasiholes and other collective modes play the relevant
degrees of freedom. The use of the Faddeev equations technique
combined with the Baym-Kadanoff approach makes possible to include all
the important collective excitations and their mutual interplay.

The result is a sophisticated formalism that provides
simultaneously information on several quantities, such as
spectroscopic factors, excitation spectra, two-nucleon knock out +and nucleon-nucleus scattering at astrophysical
energies.

I will review the results for O-16 and some previous application
for closed shell nuclei. Due to its characteristics, this approach is
a possible candidate for extending ab-initio calculations to
medium/heavy isotopes and radioactive beams.

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