Extended random-phase-approximation study of fragmentation of giant quadrupole resonance in ${}^{16}$O

Abstract

The damping of isoscalar giant quadrupole resonance in ${}^{16}$O 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.

Comments: 4 pages, 5 figures