Nuclear Giant Resonances and Linear Response

Details Nuclear Giant Resonances and Linear Response Nuclear Giant Resonances and Linear Response

2007-03-14

arxiv.org/abs/nucl-th/0703044v1

Eur.Phys.J.A32:19-23,2007

Physics

Nuclear Physics

Nuclear Theory

5 pages

Scientific paper

10.1140/epja/i2007-10366-9

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 $^{16}$O. These are mainly caused by the spin-orbit splitting.

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