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arXiv 0907.1931nucl-th
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同位旋效应与核对称能的密度依赖性

Isospin effects and the density dependence of the nuclear symmetry energy

S. R. Souza, M. B. Tsang, B. V. Carlson, R. Donangelo, W. G. Lynch, A. W. Steiner

摘要:

利用Skyrme有效相互作用的多重碎裂统计模型考察了核对称能的密度依赖性。该模型一致地考虑了在冻结阶段在有限温度下碎片体积的膨胀。通过选择参数化的Skyrme力,导致非常不同的状态方程的对称性能量,我们调查的敏感性不同的可观的属性的有效力。我们的研究结果表明,尽管是敏感的碎片的体积的热膨胀,这是很难区分的Skyrme力从isoscaling分析。另一方面,发射碎片的同位素分布对计算中使用的力非常敏感。

英文摘要:

The density dependence of the nuclear symmetry energy is inspected using the Statistical Multifragmentation Model with Skyrme effective interactions. The model consistently considers the expansion of the fragments' volumes at finite temperature at the freeze-out stage. By selecting parameterizations of the Skyrme force that lead to very different equations of state for the symmetry energy, we investigate the sensitivity of different observables to the properties of the effective forces. Our results suggest that, in spite of being sensitive to the thermal dilation of the fragments' volumes, it is difficult to distinguish among the Skyrme forces from the isoscaling analysis. On the other hand, the isotopic distribution of the emitted fragments turns out to be very sensitive to the force employed in the calculation.

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