取向晶体中的相对论性粒子非相干散射

V. Tikhomirov
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引用次数: 1

摘要

取向晶体的排列原子弦和面对粒子偏转的相干过程伴随着原子核的非相干散射。当相干粒子的偏转(由轴向或平面平均势描述)在高能量下变得越来越经典时,相对论性粒子的非相干散射本质上仍然是量子的。虽然后者让人想起非晶介质中原子在足够高的动量转移下的散射,但在最小的动量转移下,晶体中的非相干散射过程受到原子在垂直于晶体轴或平面上分布的不均匀性的影响而发生了一些改变。考虑到轴向情况是一个更一般的例子,我们提出了高能粒子在取向晶体中的非相干散射的一致理论。后者既考虑了量子散射性质,又考虑了原子分布的不均匀性,揭示了散射截面概念的有限适用性。利用新引入的均方散射角定义,阐述了将量子散射特征融入到经典弹道仿真中的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Relativistic particle incoherent scattering in oriented crystals
The coherent process of particle deflection by aligned atomic strings and planes of oriented crystals is accompanied by incoherent scattering by atomic cores. While the coherent particle deflection, described by the axial or planar averaged potential, becomes more and more classical at high energies, the incoherent scattering of relativistic particles remains essentially quantum. Though the latter reminds the scattering by atoms of amorphous medium at high enough momentum transfers, at the smallest ones the incoherent scattering process in crystals experiences some modification by the influence of the inhomogeneity of the atom distribution in the plane, normal to the crystal axis or plane. Considering the axial case as a more general example, we present a consistent theory of high energy particles incoherent scattering in oriented crystals. The latter takes into consideration both the quantum scattering nature and the atom distribution inhomogeneity, revealing the limited applicability of the scattering cross section notion. The way to incorporate the quantum scattering features into the widely used classical trajectory simulations is elaborated using newly introduced mean square scattering angle definition.
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