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arXiv 0708.2830nucl-th
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对称能作为密度和质量的函数

Symmetry Energy as a Function of Density and Mass

Pawel Danielewicz, Jenny Lee

摘要:

在核物质中的能量,在实践中,当对称性能量和对称物质的能量的密度依赖性被指定时,在不同的密度和不对称性下被完全表征。在低于正常密度的对称能的密度依赖性产生核对称系数的质量依赖性,因此,可以由后者的依赖性约束。利用对同量异位素模拟态的激发能,推导了与质量有关的对称性系数。对于中等质量和高质量的系统系数,可以用对称系数a_a^V=(31.5-33.5)MeV(体积系数)和a_a^S=(9-12)MeV(表面系数)来描述。这两个进一步对应于描述对称能的密度依赖性的参数值,L~95 MeV和K_{sym} ~25 MeV。

英文摘要:

Energy in nuclear matter is, in practice, completely characterized at different densities and asymmetries, when the density dependencies of symmetry energy and of energy of symmetric matter are specified. The density dependence of the symmetry energy at subnormal densities produces mass dependence of nuclear symmetry coefficient and, thus, can be constrained by that latter dependence. We deduce values of the mass dependent symmetry coefficients, by using excitation energies to isobaric analog states. The coefficient systematic, for intermediate and high masses, is well described in terms of the symmetry coefficient values of a_a^V=(31.5-33.5) MeV for the volume coefficient and a_a^S=(9-12) MeV for the surface coefficient. These two further correspond to the parameter values describing density dependence of symmetry energy, of L~95 MeV and K_{sym}~25 MeV.

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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