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本文讨论了用分子动力学方法研究物态方程的基本思想。用自编的分子动力学程序(三维连续势)对Ar的物态方程作了较详细计算,得到了与实验相一致的结果。 相似文献
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用二级氢气炮作为冲击压缩加载工具和多通道瞬态辐射高温计作为主要测量系统,测量了冲击压缩氦气等离子体的光辐亮度历史(初始温度293K,初始压力为1.2MPa)。根据实测记录信号波形的有关特征量,计算得到了氦等离子体的Hugoniot物态方程(含冲击温度)。结果发现:实测Hugoniot物态方程可用Saha方程加Debye-Huckel修正物理模型解释。 相似文献
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研究和详细地比较了RMF理论中不同的有效相互作用强度的密度依赖性, 并且讨论了这种密度依赖性对于核物质和中子星性质的影响. 对于核物质, 不同的参数组给出的对称核物质的饱和点非常接近, 基本都在经验值的范围内. 对于中子星, 考虑超子后不同参数组给出的质量极限的范围为1.52—2.06 M☉, 半径为10.24—11.38 km.The density dependencies of various effective interaction strengths in the relativistic mean field and their influences on the properties of nuclear matter and neutron stars are studied and carefully compared. The differences of saturation properties given by various effective interactions are subtle in symmetric nuclear matter. The Oppenheimer Volkoff mass limits of neutron stars calculated from different equations of state are 1.52—2.06 M☉, and the radii are 10.24—11.38 km with hyperons included. 相似文献
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在Brueckner-Hartree-Fock理论框架内,研究了自旋极化核物质的状态方程及其自旋依赖性,计算了相关的物理量如朗道参数G0和G′0,并着重讨论了三体核力的影响.结果表明:在整个自旋极化度范围内,自旋极化核物质的每核子能量随中子和质子自旋极化度的变化相当精确地满足二次方规律,而且在Brueckner-Hartree-Fock理论框架内,自旋非极化核物质的能量总是比相应的自旋极化核物质的能量低,这表明核物质中不会发生由自旋非极化态向自旋极化态的自发相变.当密度较低时,三体核力对核物质状态方程的自旋依赖性的影响不明显;随着密度的增大,三体核力效应增强,而且三体核力使朗道参数G0和G′0增大,从而使核物质对于自旋涨落的稳定性增强 相似文献
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对核物质状态方程的研究将有助于人们更好地了解原子核的性质以及宇宙和星体的演化过程等基本问题。重离子碰撞能产生高温高密核物质,利用输运模型的模拟结合相关实验数据的比较是研究核物质状态方程最常用方法之一。本文利用深度学习中的卷积神经元网络(CNN)方法对不同核物质状态方程给出的末态质子横动量和快度分布进行学习,使神经元网络具有从末态粒子信息来判断核物质状态方程软硬的能力。利用预测差异分析方法(Prediction Different Analysis),可以找到横动量和快度分布中对状态方程最敏感的区域。此外,还测试了一种基于决策树的梯度提升算法(LightGBM),发现得到的准确度和CNN方法类似。 相似文献
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用Bonn势和考虑强子质量Brown Rho(BR)标度规则修正,提出了改进的相对论平均场有效模型,由核物质的基态性质确定模型参数后,将该模型用来研究热密核物质系统的状态方程. 相似文献
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《中国物理快报》2016,(3)
The equation of state for nuclear matter is presented within the Brueckner-Hartree-Fock(BHF) scheme,by using the realistic Argonne V18 or Bonn B two-nucleon potentials plus their corresponding microscopic three-nucleon forces.It is then applied to calculate the properties of finite nuclei within a simple liquid-drop model,and we compare the calculated volume,surface,and Coulomb parameters with the empirical ones from the liquid drop model.Nuclear density distributions and charge radii in good agreement with the experimental data are obtained,and we predict the neutron skin thickness of various nuclei. 相似文献
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We perform a systematic calculation of the equation of state of asymmetric nuclear matter at finite temperature within the framework of the Brueckner-Hartree-Fock approach with a microscopic three-body force. When applying it to the study of hot kaon condensed matter, we find that the thermal effect is more profound in comparison with normal matter, in particular around the threshold density. Also, the increase of temperature makes the equation of state slightly stiffer through suppression of kaon condensation. 相似文献
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The extraction of nuclear matter properties from measured nuclear masses is investigated in the energy density functional formalism of nuclei.It is shown that the volume energy a1 and the nuclear incompressibility Ko depend essentially on μnN + μpZ - 2EN,whereas the symmetry energy J and the density symmetry coefficient L as well as symmetry incompressibility Ks depend essentially on μn - μp,where μp =μp - ∂Ec/∂Z,μn and μp are the neutron and proton chemical potentials respectively,EN the nuclear energy,and Ec the Coulomb energy.The obtained symmetry energy is J = 28.5 MeV,while other coefficients are uncertain within ranges depending on the model of nuclear equation of state. 相似文献
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K.C.Chung C.S.Wang A.J.Santiago 《理论物理通讯》2001,(11)
The extraction of nuclear matter properties from measured nuclear masses is investigated in the energy density functional formalism of nuclei.It is shown that the volume energy a1 and the nuclear incompressibility Ko depend essentially on μnN - - pZ - 2EN,whereas the symmetry energy J and the density symmetry coefficient L as well as symmetry incompressibility Ks depend essentially on μn - μp,where μp =μp - Ec/ Z,μn and μp are the neutron and proton chemical potentials respectively,EN the nuclear energy,and Ec the Coulomb energy.The obtained symmetry energy is J = 28.5 MeV,while other coefficients are uncertain within ranges depending on the model of nuclear equation of state.`` 相似文献
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利用非对称核物质状态方程对中子星的质量和半径的研究 总被引:1,自引:0,他引:1
在温度、密度及同位旋相关的核物质状态方程的基础上,通过求解Tol-man-Oppenheimer?Volkoff方程得到了中子星的质量与中心密度的关系,发现随着中心密度的变化,中子星存在一个最大质量.同时计算结果表明,中子星的最大质量与核物质状态方程的不可压缩系数、有效质量及对称能强度系数等密切相关.对中子星半径的研究表明,较硬的核物质状态方程给出的中子星半径较大,而且较大的对称能强度系数和较大的核子有效质量也会给出较大的中子星半径. 相似文献