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- W2090908321 abstract "We discuss the continuum response of finite nuclei in the giant resonance region in the context of a nonspectral random-phase approximation which straightforwardly includes correct continuum boundary conditions. Strongly collective discrete low-energy excitations of the nucleus are associated with poles with large residues in the random phase approximation particle-hole propagator at real excitation energies. Giant resonances, by comparison, are associated with similar poles at complex excitation energies where the imaginary part of the pole position corresponds to the escape width of the excitation. We illustrate these points with calculations of the isoscalar quadrupole response in $^{40}mathrm{Ca}$. Here giant resonances are readily identified as sharp peaks in the particle-hole propagator in the complex excitation energy plane and the relation of the peaks to the continuum response (for real excitation energies) is demonstrated. Our numerical method allows extraction of transition densities for the giant resonances with continuum effects automatically included and these are used to compute (e,e') and (ensuremath{pi},ensuremath{pi}') responses; illustrative comparisons with data are made." @default.
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- W2090908321 date "1989-11-01" @default.
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- W2090908321 title "Giant resonances at complex excitation energies" @default.
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- W2090908321 doi "https://doi.org/10.1103/physrevc.40.2195" @default.
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