Effect of the splitting of the neutron and proton effective masses on the nuclear symmetry energy at finite temperatures

Effect of the splitting of the neutron and proton effective masses on the nuclear symmetry energy at finite temperatures
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有限温度下中子和质子有效质量分裂对核对称能的影响

DOI:
10.1016/j.physletb.2011.01.062
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发表时间:
2010-12
期刊:
影响因子:
4.4
通讯作者:
刘敏
刘敏
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
李祝霞;刘敏

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基于Skyrme能量密度泛函的热力学方法,给出了有限温度下核物质对称能的温度和密度依赖关系。我们首先根据中子和质子有效质量随中子物质密度变化的范围(99.99%中子在物质中)将Skyrme相互作用分为7类。我们发现对称能的温度依赖性与中子和质子有效质量的分裂有明显的相关性。在非对称核物质中,对于Mn_(10)> Mn_(10)的Skyrme相互作用和强的中子、质子有效质量分裂,出现了对称能从低密度时随温度降低到高密度时随温度升高的转变。对于其他Skyrme相互作用,我们没有观察到这种现象,并且在整个密度区域中对称能随温度降低。
We present the temperature and density dependence of symmetry energy for nuclear matter at finite temperatures based on the thermodynamics approach with the Skyrme energy density functional. We first classify the Skyrme interactions into 7 groups according to their ranges of the variation of neutron and proton effective masses with densities in neutron matter limit (99.99 percent neutron in the matter). We find that there is an obvious correlation between the temperature dependence of the symmetry energy and the splitting of neutron and proton effective mass. For the Skyrme interactions with mn⁎>mp⁎and the strong neutron and proton effective mass splitting in asymmetric nuclear matter, a transition of symmetry energy from decreasing with temperature at low densities to increasing with temperature at high densities appears. For other Skyrme interactions, we do not observe this phenomenon and the symmetry energy decreases with temperature in the entire density region.
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