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arXiv 1802.05047nucl-thnucl-ex
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核碎裂的动力学和统计双峰性

Dynamical and statistical bimodality in nuclear fragmentation

S. Mallik, G. Chaudhuri, F. Gulminelli

摘要:

用Boltzmann-Uehling-Uhlenbeck模拟方法重新研究了重离子反应中实验测得的残留物分布中双峰行为的起源。我们认为,取决于入射能量和反应的碰撞参量,入口通道和出口通道效应可以在所观察到的行为的起源。具体而言,在我们的模拟中观察到的碰撞率的波动,以及直接链接到核液-气相变的热双峰引起的反应机制的波动。这两种现象以前在文献中提出,但作为不相容和矛盾的解释的实验测量。这些结果表明,中能重离子碰撞可以被看作是一个强有力的工具,研究两个分叉引起的非平衡临界现象,以及有限尺寸的热相变的前体。

英文摘要:

The origin of bimodal behavior in the residue distribution experimentally measured in heavy ion reactions is reexamined using Boltzmann-Uehling-Uhlenbeck simulations. We suggest that, depending on the incident energy and impact parameter of the reaction, both entrance channel and exit channel effects can be at the origin of the observed behavior. Specifically, fluctuations in the reaction mechanism induced by fluctuations in the collision rate, as well as thermal bimodality directly linked to the nuclear liquid-gas phase transition are observed in our simulations. Both phenomenologies were previously proposed in the literature, but presented as incompatible and contradictory interpretations of the experimental measurements. These results indicate that heavy ion collisions at intermediate energies can be viewed as a powerful tool to study both bifurcations induced by out-of-equilibrium critical phenomena, as well as finite size precursors of thermal phase transitions.

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