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arXiv 0811.3107nucl-exnucl-th
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对对称能密度依赖性的限制

Constraints on the density dependence of the symmetry energy

M. B. Tsang, Yingxun Zhang, P. Danielewicz, M. Famiano, Zhuxia Li, W. G. Lynch, A. W. Steiner

摘要:

用改进的量子分子动力学输运模型模拟了112 Sn和124 Sn核的碰撞。计算结果再现了两种不同观测量的同位旋扩散数据和中子、质子谱的比值。通过将这些数据与在饱和密度下的对称能和对称能的密度依赖性的不同表示的范围内进行的计算进行比较,获得在次正常密度下的对称能的密度依赖性的约束。从目前的工作结果进行比较,在其他最近的分析提出的限制。

英文摘要:

Collisions involving 112Sn and 124Sn nuclei have been simulated with the improved Quantum Molecular Dynamics transport model. The results of the calculations reproduce isospin diffusion data from two different observables and the ratios of neutron and proton spectra. By comparing these data to calculations performed over a range of symmetry energies at saturation density and different representations of the density dependence of the symmetry energy, constraints on the density dependence of the symmetry energy at sub-normal density are obtained. Results from present work are compared to constraints put forward in other recent analysis.

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