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首页> 外文期刊>Physical review, C >Systematic studies of the influence of single-particle resonances on neutron halo and skin in the relativistic-mean-field and complex-momentum-representation methods
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Systematic studies of the influence of single-particle resonances on neutron halo and skin in the relativistic-mean-field and complex-momentum-representation methods

机译：单颗粒共振对相关性 - 平均场中中子卤素和皮肤影响的系统研究及复合动量 - 表示方法

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摘要

The newly developed relativistic-mean-field and complex-momentum-representation (RMF-CMR) method is used to explore the exotic structure for the neutron-rich Ca, Ni, Sn, and Pb isotopes. The results are compared with the relativistic Hartree-Bogoliubov (RHB) calculations as well as the available data. The calculated root mean square (rms) radius of the neutron and proton suggests a halo or giant halo structure in the Ca isotopes with neutron number more than N = 40, and a thick neutron skin in the extremely neutron-rich Ni, Sn, and Pb isotopes. The extracted two-neutron separation energies agree the experimental data as well as the RHB calculations. The conclusions are supported by the available single particle levels, the valence nucleon occupations, the contributions of resonant and weakly bound levels to the neutron rms radius, the density distributions of the occupation levels, and the total neutron, proton, and matter densities. Especially, it is found that the unusually increasing radius comes mainly from the contributions of the weakly bound levels with lower orbital angular momentum, and the diffuse density distributions, like the halo, originate mostly from the resonant levels with lower orbital angular momentum in the vicinity of the continuum threshold. The predication on the structure of halo and skin in the neutron-rich Ca, Ni, Sn, and Pb isotopes are of referential value for experiment.
机译：新开发的相对论 - 平均场和复杂的动量 - 表示（RMF-CMR）方法用于探索中子Ca，Ni，Sn和Pb同位素的异国结构。将结果与相对论的Hartree-Bogoliubov（RHB）计算和可用数据进行比较。中子和质子的计算的根均线（RMS）半径表明Ca同位素中的晕晕或巨晕结构，中子数大于n = 40，以及富含中子的Ni，Sn和浓稠的中子皮Pb同位素。提取的两个中子分离能量同意实验数据以及RHB计算。该结论由可用的单粒子水平，价核占用，谐振的贡献和弱束缚水平与中子率半径的贡献，占用水平的密度分布以及总中子，质子和物质密度的贡献。特别地，发现异常增加的半径主要来自具有较低轨道角动量的弱界水平的贡献，以及漫射密度分布，如卤素，主要来自谐振水平，附近具有较低轨道角动量的谐振水平连续阈值。富含中子Ca，Ni，Sn和Pb同位素中卤素和皮肤结构的预测是实验的参照值。

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