轻系统多重碎裂的同位旋效应

Isospin Effects on Multifragmentation of Light Mass System

利用同位旋相关的量子分子动力学模型，对＾４０Ｃａ＋＾４０Ｃａ和＾４０Ａｒ＋＾４０Ａｒ系统在不同入射能量时，同位旋效应对多重碎裂的影响进行了讨论。低能区的多重碎裂由于多种同位旋相关的因素相互抵消，因此多重碎裂的同位旋效应不明显。随着能量的增加，同位旋相关的戴面造成多重碎裂的明显差别。

The influence of isospin effects on the multifragmentation in the head-on collisions of the system ~40Ca +~40Ca and ~40Ar + ~40Ar for different incident energies is discussed by using isospin dependent quantum molecular dynamics model (IQMD). It is found that the intermediate mass fragment (IMF) has obvious difference at high incident energy, because the nucleon-nucleon cross section effects is major in the process of heavy ion collision. Thus, we have some opportunities to extract the information of nucleon-nucleon cross section. At low energy various isospin effects affect each other, resulting in no obvious difference in the IMF between two systems.