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arXiv 1005.0962nucl-th
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过饱和密度下的核对称势能为负吗?

Can the nuclear symmetry potential at supra-saturation densities be negative?

Gao-Chan Yong

摘要:

在同位旋相关的Boltzmann-Uehling-Uhlenbeck(IBUU)输运模型框架下,研究了入射能量为400 MeV/核子的中心$^{197}$ Au+ $^{197}$ Au反应中,核对称势对超饱和密度下预平衡团簇发射的影响.结果表明,在正对称势下,质量数为$A\leq3$的轻团簇的中子质子比($(n/p)_{A\leq3}$)大于质量数为$A>3$的轻团簇的中子质子比($(n/p)_{A>3}$),而在负对称势下,质量数为$(n/p)_{A\leq3}$的重团簇的中子质子比(\emph{smaller})大于质量数为$(n/p)_{A>3}$的重团簇的中子质子比.这可以被认为是在过饱和密度的负对称势的探针。

英文摘要:

In the framework of an Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, for the central $^{197}$Au+$^{197}$Au reaction at an incident beam energy of 400 MeV/nucleon, effect of nuclear symmetry potential at supra-saturation densities on the pre-equilibrium clusters emission is studied. It is found that for the positive symmetry potential at supra-saturation densities the neutron to proton ratio of lighter clusters with mass number $A\leq3$ ($(n/p)_{A\leq3}$) is larger than that of the weighter clusters with mass number $A>3$ ($(n/p)_{A>3}$), whereas for the negative symmetry potential at supra-saturation densities the $(n/p)_{A\leq3}$ is \emph{smaller} than that of the $(n/p)_{A>3}$. This may be considered as a probe of the negative symmetry potential at supra-saturation densities.

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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