物理学报2001，Vol.50Issue(4)：638-643,6.
稳定和不稳定核巨共振性质的相对论研究
GIANT RESONANCE PROPERTIES IN β STABLE AND UNSTABLE NUCLEI
曹李刚 1刘玲 1陈宝秋 2马中玉3
作者信息
- 1. 中国原子能科学研究院,
- 2. 中国原子能科学研究院,；兰州重离子加速器国家实验室原子核理论中心,
- 3. 中国原子能科学研究院,；兰州重离子加速器国家实验室原子核理论中心,中国科学院理论物理研究所,
- 折叠
摘要
Abstract
We study the giant resonances of stable and unstable nuclei in the framework of the consistent relativistic random phase approximation built on the nonlinear relativistic mean field (RMF) ground states. The isoscalar and isovector modes of giant resonances for stable nuclei, such as 208Pb, 144Sm,116Sn, 90Zr, 40Ca, 16O and Ca isotope chains are investigated. The contribution to the giant resonances from the Dirac sea states and the currents of vector mesons are examined. The results show that the effects of the Dirac sea states on the isoscalar giant modes are pronounced, but become weaker for light nuclei, while the contributions of the isovector modes are negligible. The few sets of parameterizations of nonlinear RMF model, which are commonly used to give a good description of ground-state properties of finite nuclei, could also well describe the nuclear dynamic properties-giant resonances. For nuclei with the extreme value of N/Z, low-lying collective excitations are found in isovector dipole modes, which are mainly due to the ph excitation of the weakly bound states near Fermi surface and the isospin mixture effect.关键词
相对论无规位相近似/核巨共振分类
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曹李刚,刘玲,陈宝秋,马中玉..稳定和不稳定核巨共振性质的相对论研究[J].物理学报,2001,50(4):638-643,6.
