arXiv 1606.075592016-06nucl-thnucl-ex

高密度核物质中介质效应的核-核弹性散射系统分析

Medium effect in high-density nuclear matter probed by systematic analyses of nucleus-nucleus elastic scattering

T. Furumoto, Y. Sakuragi, Y. Yamamoto

备注：: 29 pages, 11 figures, accepted in Physical Review C. arXiv admin note: substantial text overlap with arXiv:1406.3718
DOI：: 10.1103/PhysRevC.94.044620

摘要：

在具有复杂$G$ -矩阵相互作用的双折叠（DF）模型框架下，利用核-核弹性散射研究了高密度核物质的性质.基于冻结密度近似（FDA），采用两种方法研究了包含三体力（TBF）效应的介质效应。在$E/A =$ 70 MeV下，对$^{16}$ O + $^{16}$ O体系的势能和弹性截面有明显的介质效应.介质效应的重要作用也被其他有效的核子-核子（$NN$）相互作用所证实。此外，本文的方法也适用于其它重离子弹性散射系统。在重离子弹性截面中也可以清楚地看到介质效应。随着靶质量和入射能量的增加（直到$E/A =$ 200 MeV），介质对弹性截面的影响变得不可见。然而，介质效应对于确定$E/A =$ 200 MeV以上的重离子散射同样重要。最后，我们明确了TBF效应在$k_F =$ 1.6 fm $^{-1}$的核-核弹性散射中的关键作用。

英文摘要：

We investigate the property of the high-density nuclear matter probed by the nucleus-nucleus elastic scattering in the framework of the double-folding (DF) model with the complex $G$-matrix interaction. The medium effect including three-body-force (TBF) effect is investigated with present two methods based on the frozen density approximation (FDA). The medium effect is clearly seen on the potential and the elastic cross section for the $^{16}$O + $^{16}$O system at $E/A =$ 70 MeV. The crucial role of the medium effect is also confirmed with other effective nucleon-nucleon ($NN$) interactions. In addition, the present methods are applied to other heavy-ion elastic scattering systems. Again, the medium effect is clearly seen in the heavy-ion elastic cross section. The medium effect on the elastic cross section becomes invisible with the increase of the target mass and the incident energy (up to $E/A =$ 200 MeV). However, the medium effect is again important to fix the heavy-ion scattering over $E/A =$ 200 MeV. Finally, we make clear the crucial role of the TBF effect up to $k_F =$ 1.6 fm$^{-1}$ in the nucleus-nucleus elastic scattering.

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