标题： 非对称核物质在自旋分解区的输运性质 显示英文标题

标题： Transport properties of asymmetric nuclear matter in the spinodal region

摘要： 我们基于盒子系统中的IBUU输运模拟，在机械和化学不稳定性区域内研究了非对称核物质的剪切粘度和体积粘度。 使用格林-库博方法计算这些粘度，该方法采用了一个具有热簇的动态平衡核系统。 虽然剪切粘度的行为主要受能量依赖的核子-核子碰撞截面影响，但在存在核簇的情况下，体积粘度相比均匀核物质显著增加。 增加同位素不对称性通常会增加两种粘度，但一旦同位素不对称性大到足以显著影响自旋分解区域，它们的行为就会定性地改变。 我们的计算表明，体积粘度比剪切粘度对核簇更敏感，因此是一个与非对称核物质相图相关的稳健量。 显示英文摘要

摘要： We have studied the shear and bulk viscosities of asymmetric nuclear matter in the mechanical and chemical instability region based on IBUU transport simulations in a box system. The Green-Kubo method is used to calculate these viscosities with a prepared dynamically equilibrated nuclear system with hot clusters. While the behavior of the shear viscosity is largely affected by energy-dependent nucleon-nucleon cross sections, the bulk viscosity increases significantly in the presence of nuclear clusters compared to that in uniform nuclear matter. Increasing isospin asymmetry generally increases both viscosities, while their behaviors are qualitatively modified once the isospin asymmetry is large enough to affect significantly the spinodal region. Our calculation shows that the bulk viscosity is more sensitive to the nuclear clustering than the shear viscosity, and is thus a robust quantity related to the phase diagram of asymmetric nuclear matter.