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arXiv 1504.03243nucl-th
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Gogny力作用下稀土核四极和八极态的光谱

Spectroscopy of quadrupole and octupole states in rare-earth nuclei from a Gogny force

K. Nomura, R. Rodríguez-Guzmán, L. M. Robledo

摘要:

在相互作用玻色子模型(IBM)的框架内,用一系列Sm和Gd同位素描述了集体四极和八极态,其哈密顿量参数由Gogny能量密度泛函的平均场计算导出.两个框架之间的联系是($β_2β_3$)势能面,在Gogny力的情况下,在Hartree-Fock-Bogoliubov框架内计算。IBM哈密顿量的对角化提供了包括正宇称态和负宇称态的各种状态的激发能和跃迁强度。所得的光谱性质进行了比较与现有的实验数据,也与配置混合计算的结果与Gogny力内的发电机坐标法(GCM)。激发态$0^{+}$的结构及其与双八极声子的关系也得到了解决。结果表明,该模型较好地描述了低能四极和八极集体结构的经验趋势,并与Gogny力的GCM结果相一致.

英文摘要:

Collective quadrupole and octupole states are described in a series of Sm and Gd isotopes within the framework of the interacting boson model (IBM), whose Hamiltonian parameters are deduced from mean field calculations with the Gogny energy density functional. The link between both frameworks is the ($β_2β_3$) potential energy surface computed within the Hartree-Fock-Bogoliubov framework in the case of the Gogny force. The diagonalization of the IBM Hamiltonian provides excitation energies and transition strengths of an assorted set of states including both positive and negative parity states. The resultant spectroscopic properties are compared with the available experimental data and also with the results of the configuration mixing calculations with the Gogny force within the generator coordinate method (GCM). The structure of excited $0^{+}$ states and its connection with double octupole phonons is also addressed. The model is shown to describe the empirical trend of the low-energy quadrupole and octupole collective structure fairly well, and turns out to be consistent with GCM results obtained with the Gogny force.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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