Striganov S I
Accelerator Division, Fermi National Accelerator Laboratory, MS 220, Batavia, IL 60510-0500, USA.
Radiat Prot Dosimetry. 2005;116(1-4 Pt 2):293-6. doi: 10.1093/rpd/nci107.
The Moliere theory of multiple Coulomb scattering is modified to take into account the difference between processes of scattering off atomic nuclei and electrons. A simple analytical expression for angular distribution of charged particles passing through a thick absorber is found. It does not assume any special form for a differential scattering cross section and has a wider range of applicability than a gaussian approximation. A well-known method to simulate multiple Coulomb scatterings is based on treating 'soft' and 'hard' collisions differently. An angular deflection in a large number of 'soft' collisions is sampled using the proposed distribution function, a small number of 'hard' collision are simulated directly. A boundary between 'hard' and 'soft' collisions is defined, providing a precise sampling of a scattering angle (1% level) and a small number of 'hard' collisions. A corresponding simulating module takes into account projectile and nucleus charged distributions and exact kinematics of a projectile-electron interaction.
莫利埃多重库仑散射理论经过修正，以考虑原子核散射过程与电子散射过程之间的差异。得到了带电粒子穿过厚吸收体时角分布的简单解析表达式。它不假定微分散射截面具有任何特殊形式，并且比高斯近似具有更广泛的适用范围。一种模拟多重库仑散射的著名方法是基于对“软”碰撞和“硬”碰撞进行不同处理。使用所提出的分布函数对大量“软”碰撞中的角偏转进行采样，直接模拟少量“硬”碰撞。定义了“硬”碰撞和“软”碰撞之间的边界，从而对散射角进行精确采样（1%水平）并减少少量“硬”碰撞。相应的模拟模块考虑了射弹和原子核的电荷分布以及射弹 - 电子相互作用的精确运动学。
