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Nuclear giant resonances and linear response
Authors:P. -G. Reinhard  Lu Guo  J. A. Maruhn
Affiliation:1.Institut für Theoretische Physik II,Universit?t Erlangen,Erlangen,Germany;2.Institut für Theoretische Physik,Universit?t Frankfurt,Frankfurt am Main,Germany
Abstract:We search for nonlinear effects in nuclear giant resonances (GRs), in particular the isovector dipole and the isoscalar quadrupole modes. To that end, we employ a spectral analysis of time-dependent Hartree-Fock (TDHF) dynamics using Skyrme forces. Based on TDHF calculations over a wide range of excitation amplitudes, we explore the collectivity and degree of harmonic motion in these modes. Both GR modes turn out to be highly harmonic in heavy nuclei from A = 100 on. There is no trace of a transition to irregular motion and multiple resonances are predicted. Slight anharmonicities are seen for light nuclei, particularly for 16O. These are mainly caused by the spin-orbit splitting.
Keywords:21.10.Re Collective levels  21.60.Jz Hartree-Fock and random-phase approximations  24.30.Cz Giant resonances
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