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arXiv 1104.3941nucl-th
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富中子Yb,Hf,W,Os和Pt同位素的集体结构演化

Collective structural evolution in neutron-rich Yb, Hf, W, Os and Pt isotopes

K. Nomura, T. Otsuka, R. Rodriguez-Guzman, L. M. Robledo, P. Sarriguren

摘要:

本文将Hartree-Fock-Bogoliubov计算得到的相互作用玻色子模型哈密顿量和新的微观Gogny能量密度泛函D1 M应用于质量为$A\sim 180-200$的富中子Yb、Hf、W、Os和Pt同位素的光谱分析。用这种方法计算了相应的低四极集体态的激发能和跃迁率。通过计算激发能、基态中的$B$(E2)比和相关能,分析了在给定的同位素链中,从长球形到扁球形基态形状的转变作为中子数$N$的函数。结果表明,当偏离质子壳层闭合Z=82时,质子数较低的同位素$Z$的这种跃迁往往发生得更快。三轴自由度在描述所考虑的质量区域中起着重要的作用。预测的低位光谱的中子丰富的异国情调的Hf和Yb同位素。在模型中使用的近似值和改进其预测能力的可能性得到解决。

英文摘要:

An interacting boson model Hamiltonian determined from Hartree-Fock-Bogoliubov calculations with the new microscopic Gogny energy density functional D1M, is applied to the spectroscopic analysis of neutron-rich Yb, Hf, W, Os and Pt isotopes with mass $A\sim 180-200$. Excitation energies and transition rates for the relevant low-lying quadrupole collective states are calculated by this method. Transitions from prolate to oblate ground-state shapes are analyzed as a function of neutron number $N$ in a given isotopic chain by calculating excitation energies, $B$(E2) ratios, and correlation energies in the ground state. It is shown that such transitions tend to occur more rapidly for the isotopes with lower proton number $Z$, when departing from the proton shell closure Z=82. The triaxial degrees of freedom turn out to play an important role in describing the considered mass region. Predicted low-lying spectra for the neutron-rich exotic Hf and Yb isotopes are presented. The approximations used in the model and the possibilities to refine its predictive power are addressed.

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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