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Displacement cascade decomposition within the Binary Collision Approximation

机译：二元碰撞近似内的位移级联分解

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The mechanism of damage production in solids during irradiation is of great practical interest in nuclear technology. The need to increase the life time of current nuclear plants as well as extreme conditions (high temperature and high neutron flux) in new generations of nuclear plants leads to have a deep insight into radiation damage in solids. In fact, the slowing down of particles in solids leads to a non homogeneous distribution of defects in solids, giving rise to complex microstructures with unusual properties. Numerous experiments, Molecular Dynamics (MD) and Monte Carlo (MC) simulations have clearly shown that highly damaged areas called displacement cascades are produced by neutron or impinging ions in solids. It is now clearly established that the number and the distribution of these subcascades dictate the long term evolution of the microstructure under irradiation. In this work, we present a new model to calculate the mean number of displacement cascades produced in a mono-atomic solid by an incident particle within the Binary Collision Approximation framework (BCA) taking into account all information extracted from MD simulations. To reach such a goal, the notion of subcascade threshold energy is introduced and discussed on some examples. Within this formalism, we exhibit a new way to estimate the number of defects created in a displacement cascade integrating results of MD simulations of cascades.
机译：辐射过程中固体中产生损害的机理在核技术中具有重大的实际意义。需要增加当前核电站的寿命以及新一代核电站的极端条件（高温和高中子通量），使人们对固体的辐射破坏有了深刻的认识。实际上，固体中颗粒的减慢导致固体中缺陷的不均匀分布，从而产生了具有异常特性的复杂微结构。大量实验，分子动力学（MD）和蒙特卡洛（MC）模拟清楚地表明，被称为位移级联的高度损坏区域是由中子或撞击固体中的离子产生的。现在已经清楚地确定，这些亚级联的数量和分布决定了在辐射下微观结构的长期演变。在这项工作中，我们提出了一个新模型来计算在二进制碰撞近似框架（BCA）中由入射粒子在单原子固体中产生的位移级联的平均数，其中考虑了从MD模拟中提取的所有信息。为了实现这一目标，引入了级联阈值能量的概念，并在一些示例中进行了讨论。在这种形式上，我们展示了一种新的方式来估计位移级联中所产生的缺陷数量，这些缺陷级联了级联的MD模拟结果。

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