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首页> 外文期刊>Physical review, C >Symmetry energy of cold nucleonic matter within a relativistic mean field model encapsulating effects of high-momentum nucleons induced by short-range correlations
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Symmetry energy of cold nucleonic matter within a relativistic mean field model encapsulating effects of high-momentum nucleons induced by short-range correlations

机译：相对论平均场模型中的冷核磁素对称能量在短距离相关性致核核磁共振的封装效应

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摘要

It is well known that short-range nucleon-nucleon correlations (SRC) from the tensor components and/or the repulsive core of nuclear forces lead to a high-(low-) momentum tail (depletion) in the single-nucleon momentum distribution above (below) the nucleon Fermi surface in cold nucleonic matter. Significant progress was made recently in constraining the isospin-dependent parameters characterizing the SRC-modified single-nucleon momentum distribution in neutron-rich nucleonic matter using both experimental data and microscopic model calculations. Using the constrained single-nucleon momentum distribution in a nonlinear relativistic mean field (RMF) model, we study the equation of state (EOS) of asymmetric nucleonic matter (ANM), especially the density dependence of nuclear symmetry energy E-sym(rho). First, as a test of the model, the average nucleon kinetic energy extracted recently from electron-nucleus scattering experiments using a neutron-proton dominance model is well reproduced by the RMF model incorporating effects of the SRC-induced high-momentum nucleons, while it is significantly under predicted by the RMF model using a step function for the single-nucleon momentum distribution as in free Fermi gas (FFG) models. Second, consistent with earlier findings within nonrelativistic models, the kinetic symmetry energy of quasinucleons is found to be E-sym(kin) (rho 0) = -16.94 +/- 13.66MeV which is dramatically different from the prediction of E-sym(kin) (rho 0) +/- 12.5 MeV by FFG models at nuclear matter saturation density rho 0 = 0.16 fm(-3). Third, comparing the RMF calculations with and without the high-momentum nucleons using two sets of model parameters both reproducing identically all empirical constraints on the EOS of symmetric nuclear matter (SNM) and the symmetry energy of ANM at rho 0, the SRC-modified single-nucleon momentum distribution is found to make the E-sym(rho) more concave around rho 0 by softening it significantly at both subsaturation and suprasaturation densities, leading to an isospin-dependent incompressibility of ANM in better agreement with existing experimental data. Fourth, the maximum mass of neutron stars is enhanced by the increased kinetic pressure from high-momentum nucleons at suprasaturation densities in SNM.
机译：众所周知，从张量组分和/或核动力的排斥核心的短程核核核相关（SRC）导致上述单核素动量分布的高（低）动量尾部（耗尽） （下面）冷核磁物质中的核仁Fermi表面。最近在使用实验数据和微观模型计算中限制了表征富含SRC改性的单核素动量分布的异位旋流依赖性参数的显着进展。在非线性相对论平均场（RMF）模型中使用约束的单核动量分布，我们研究了不对称核子物质（ANM）的状态（EOS）的等式，尤其是核对称能量E-SYM（RHO）的密度依赖性。首先，作为模型的测试，通过使用中子 - 质子优势模型的电子核散射实验来提取的平均核素动能由SRC诱导的高动量核聚核群的RMF模型进行了很好的再现，同时使用RMF模型的预测值显着地使用单核电片动量分布，如在游离费米气体（FFG）模型中。其次，与非椭圆体模型中的早期发现一致，发现Quasinicons的动力学对称能量是E-SYM（KIN）（RHO 0）= -16.94 +/- 13.66mev，其与E-SYM的预测显着不同（ Kin）（RHO 0）+/- 12.5 MEV在核物质饱和密度rho 0 = 0.16 fm（-3）时的FFG模型。第三，使用两组模型参数与高势核聚物进行比较RMF计算，两组模型参数同样地相同地对称核物质（SNM）的所有经验约束以及ANM在rhO 0的ANM的对称能量，SRC改性发现单核动量分布在余下和上饱和密度下显着软化rho 0，使E-sym（rho）更加凹陷，导致ANM的异位旋转依赖性不可压缩，与现有的实验数据更好。第四，通过SNM的超高饱和度密度从高动量核聚物增加的动力压力增加了中子恒星的最大质量。

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