预碎片的衰变对中能区重离子碰撞过程中集体流和核阻止本领的影响
Nuclear Physics Review（2024）
Abstract
重离子碰撞过程中轻粒子的产生对于提取核物质状态方程的信息有着重要的作用。基于极端相对论量子分子动力学（UrQMD）模型，利用统计衰变模型GEMINI++处理预激发碎片的衰变，研究了预碎片的衰变对中能区Au+Au碰撞过程中轻粒子的集体流和核阻止本领的影响。研究发现，由于记忆效应，重离子碰撞过程中的预碎片的衰变产生的子核继承了母核的部分动力学性质，在考虑预碎片的衰变后可以更好地描述实验数据，并且这种效应对观测量的影响随碰撞能量的升高而减弱。结果表明，重离子碰撞过程中预碎片的衰变以及轻粒子的产生对敏感于核物质状态方程的观测量有着一定的影响。在利用这些观测量提取核物质状态方程的信息时应当仔细处理。
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Key words
heavy-ion collisions,statistical decay,collective flow,nuclear stopping power
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