Collective response of nuclei: Comparison between experiments and extended mean-field calculations
作者： Denis Lacroix , Sakir Ayik , Philippe Chomaz
DOI: 10.1103/PHYSREVC.63.064305
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摘要: The giant monopole, dipole and quadrupole responses in $^{40}$Ca, $^{90}$Zr, $^{120}$Sn $^{208}$Pb are investigated using linear response treatment based on a stochastic one-body transport theory. Effects of the coupling to low-lying surface modes (coherent mechanism) incoherent mechanism due nucleon-nucleon collisions included beyond usual mean-field description. We emphasize importance both fragmentation damping resonance. Calculated spectra compared with experiment terms percentage Energy-Weighted Sum-Rules various energy regions. obtained reasonable agreement all cases. A special attention as been given Giant Quadrupole Resonance calcium lead. In particular, equal splitting $2^{+}$ $^{40}$Ca is correctly reproduced. addition, appearance fine structure partly described by calculations which coherent play an important role.
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