标题： 膨胀核物质的旋节分解和多重碎片化 显示英文标题

标题： Spinodal decomposition of expanding nuclear matter and multifragmentation

摘要： 膨胀核物质的密度涨落是在一个平均场模型中研究的，其中涨落由外部随机场产生。 涨落围绕着对应于描述系统缓慢膨胀的流体力学运动的一个平均单体相空间密度发展。 获得了一个适用于均匀膨胀介质的涨落-耗散关系，并用于限制随机场的强度。 导出了旋节分解中液态区域的分布。 将相关碎片尺寸分布与核多重分裂的实验数据进行比较，结果相当令人满意。 显示英文摘要

摘要： Density fluctuations of expanding nuclear matter are studied within a mean-field model in which fluctuations are generated by an external stochastic field. Fluctuations develop about a mean one-body phase-space density corresponding to a hydrodinamic motion that describes a slow expansion of the system. A fluctuation-dissipation relation suitable for a uniformly expanding medium is obtained and used to constrain the strength of the stochastic field. The distribution of the liquid domains in the spinodal decomposition is derived. Comparison of the related distribution of the fragment size with experimental data on the nuclear multifragmentation is quite satisfactory.