Extended random-phase-approximation study of fragmentation of giant quadrupole resonance in 16O
Abstract
The damping of isoscalar giant quadrupole resonance in 16O is studied using extended random-phase-approximation approaches derived from the time-dependent density-matrix theory. It is pointed out that the effects of ground-state correlations bring strong fragmentation of quadrupole strength even if the number of two particle--two hole configurations is strongly limited.
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