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在完全自洽的相对论无规位相近似下研究了核的集体激发,分析了核的多极巨共振和低的集体激发态的相对论无规位相近似计算结果。研究表明采用的有效拉格朗日密度不仅能在相对论平均场理论下很好地描述核的基态性质,而且能给出核的低集体激发态和巨共振态的能量与实验数据令人满意的符合。相对论无规位相近似方法能成功描述有限核动力学性质的两个基本要点是:1)有效拉格朗日密度必须包含介子的非线性自相互作用;2)Dirac海中负能态的完全自洽处理。
In a completely self-consistent relativistic random phase approximation, the collective excitation of nuclei is studied. The results of the approximation of the relativistic random phase of the multi-pole giant resonance and the low collective excited state are analyzed. The results show that the effective Lagrangian density can not only well describe the ground state properties of the nucleus under the theory of relativistic mean fields, but also give the energies of the low-collective excited state and the giant resonance state of the nucleus to be satisfactory with the experimental data meets the. The two basic points that the relativistic random approximation method can successfully describe the properties of finite nuclear dynamics are: 1) the effective Lagrange density must contain the nonlinear self-interaction of the meson; 2) the complete self-consistent of the negative energy state in the Dirac sea deal with.