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arXiv 1111.5073nucl-th
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中子质子比对重离子碰撞中对称能高密度行为的敏感性

Sensitivity of neutron to proton ratio toward the high density behavior of symmetry energy in heavy-ion collisions

S. Kumar, Y. G. Ma, G. Q. Zhang, C. L. Zhou

摘要:

亚饱和和过饱和密度下的对称能对于理解非对称核物质和中子星的确切性质具有重要意义,但人们对它的了解还很少,特别是在过饱和密度下。我们将在这里证明,中子质子比从不同类型的碎片是能够确定的对称性能量的超饱和行为或没有。为此,一系列的Sn同位素模拟在不同的入射能量使用的同位旋量子分子动力学(IQMD)模型与软或硬的对称性能量的本研究。结果表明,来自自由核子和LCP的单个中子质子比对系统的对称能、入射能和同位旋不对称性都很敏感。然而,在双中子质子比的情况下,这只对自由核子是正确的。利用自由核子的中子质子比可以研究对称能的高密度行为。

英文摘要:

The symmetry energy at sub and supra-saturation densities has a great importance in understanding the exact nature of asymmetric nuclear matter as well as neutron star, but, it is poor known, especially at supra-saturation densities. We will demonstrate here that the neutron to proton ratios from different kind of fragments is able to determine the supra-saturation behavior of symmetry energy or not. For this purpose, a series of Sn isotopes are simulated at different incident energies using the Isospin Quantum Molecular Dynamics (IQMD) model with either a soft or a stiff symmetry energy for the present study. It is found that the single neutron to proton ratio from free nucleons as well as LCP's is sensitive towards the symmetry energy, incident energy as well as isospin asymmetry of the system. However, with the double neutron to proton ratio, it is true only for the free nucleons. It is possible to study the high density behavior of symmetry energy by using the neutron to proton ratio from free nucleons.

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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