Binary collisions of either stable or radioactive heavy ions at Fermi energies allow to study the nuclear reaction mechanisms under dynamical conditions of non-equilibrium and the formation of transient pieces of nuclear matter of very short mean life times at sub-normal density. An important role in the evolutionary phase of the collision is played by the gradient of the nuclear density affecting the isospin asymmetry of the reaction products by typical transport phenomena such as the isospin diffusion and drift. Experimental determination of the value of the nuclear matter density in the early phase of the collision is a crucial step towards understanding the underlying mechanism responsible for the production of clusters. In this paper a method for evaluating the nuclear density in semi-peripheral collisions in the reaction \(^{124}Sn + ^{64}Ni\) at 35 MeV/nucleon as studied with the CHIMERA multi-particle detector is described.

中文翻译：

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用CHIMERA检测器确定费米能量的核颈密度

费米能量上稳定或放射性重离子的二元碰撞使我们能够研究在非平衡动力学条件下的核反应机理，以及在低于正常密度下平均寿命很短的瞬态核物质的形成。在碰撞演化阶段的重要作用是核密度的梯度通过典型的运输现象（例如，同位旋的扩散和漂移）影响反应产物的同位旋的不对称性。在碰撞早期阶段，实验确定核物质密度的值是迈向了解负责产生团簇的潜在机制的关键步骤。本文提出了一种评估反应中半外围碰撞中核密度的方法描述了使用CHIMERA多粒子检测器研究的35 MeV /核子的\（^ {124} Sn + ^ {64} Ni \）。