不完全氘晶体中的冷中子散射
Cold neutron scattering in imperfect deuterium crystals
摘要：
计算了不同靶温下镶嵌氘晶体中冷中子散射的微分截面。对中子波长$λ\approx$ ~1--9~ π的理论计算结果与最近的实验数据进行了比较。结果表明，观察到的布拉格峰的结构可以解释由约$3^{\circ}$的镶嵌扩展和贡献从有限数量的晶体取向。在超冷中子上散射中，由于固体氘中的相干声子湮灭，这种晶体结构也应该考虑。
英文摘要：
The differential cross sections for cold neutron scattering in mosaic deuterium crystals have been calculated for various target temperatures. The theoretical results are compared with the recent experimental data for the neutron wavelengths $λ\approx$~1--9~Å. It is shown that the structures of observed Bragg peaks can be explained by the mosaic spread of about $3^{\circ}$ and contributions from a~limited number of crystal orientations. Such a~crystal structure should be also taken into account in ultracold neutron upscattering due to the coherent phonon annihilation in solid deuterium.
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