论文标题
在平均场扩展中检查的重离子碰撞中的表面和体积不稳定性之间的相互作用
Interplay between surface and volume instabilities in heavy-ion collisions examined within mean-field extensions
论文作者
论文摘要
在从核物质到有限核的过渡中，与核表面或大块有关的复杂有限尺寸效应，其特征是开放系统的特征。此外，该过程的非平衡性特征，典型的剧烈重型离子碰撞（从费米能量到中间能源域）也加起来。最终的动力学是表面和体积不稳定模式的组合，这些模式触发了大振幅波动。可能会出现各种各样的碎裂模式，从准直的核簇流到将拉伸的核复合物分成几个大碎片。它们暗示着密度和表面张力的不同条件，并导致时间表不同。在实验中已经观察到了这种现象学，但是通常很难识别和解开潜在的不稳定性类型。举一个例子，选择了两个极变形的核系统，在费米能量下方和上方产生的两个极变形的核系统在Boltzmann-Langevin的一体方法中沿其演变进行了选择，并沿着它们的演变进行了遵循。
In the transition from nuclear matter to finite nuclei, complex finite-size effects which characterise open systems arise, in relation with either the nuclear surface or the bulk. In addition, the non-equilibrium character of the process, typical of violent heavy-ion collisions (from Fermi energy to the intermediate-energy domain) adds up as well. The resulting dynamics is the combination of surface and volume unstable modes which trigger large-amplitude fluctuations. A rich variety of fragmentation patterns may emerge, ranging from collimated streams of nuclear clusters to the split of a stretched nuclear complex into few large fragments. They imply different conditions of density and surface tension, and result in different chronologies. Such phenomenology has been observed in experiments, but it is often difficult to recognise and disentangle the underlying types of instabilities. To draw some example, two extremely deformed nuclear systems, produced below and above Fermi energy, are chosen and followed microscopically all along their evolution within the Boltzmann-Langevin One-Body approach.
