中子球波通过厚的、振动的锗单晶的传播。

IF 1.8 4区 材料科学
Acta Crystallographica Section A Pub Date : 2013-03-01 Epub Date: 2013-01-08 DOI:10.1107/S0108767312043905
E Raitman, V Gavrilov, D Mjasishchev, A Hoser, O Seidel, J Stanh
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引用次数: 0

摘要

本文介绍了超声对中子波在厚锗晶体中传播影响的实验和理论研究结果。测量了鲍曼扇形内劳厄衍射情况下的中子强度分布。在低振幅的超声波中观察到干涉效应(衍射强度跳动)。由于整个晶体的声场分布是均匀的,所以观测是可能的。与经典的Shull实验不同,使用了宽分析缝或位置敏感检测器。为了解释得到的结果,提出了一种修正的理论来解释晶体在声激发下中子衍射强度的空间分布。实验结果与理论结果吻合较好。在高振幅的超声波中,没有观察到向运动学散射的过渡,尽管在超声产生的晶格中有很大的应变。这可能与具有驻波周期的超晶格的形成有关。观察到衍射强度的强烈上升和中子束在博尔曼扇中心的急剧收缩。这一新效应可用于超声控制单色仪的研制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Propagation of neutron spherical waves through a thick, vibrating Ge single crystal.

The results of experimental and theoretical studies into the influence of ultrasound on the propagation of neutron waves in a thick Ge crystal are presented. The neutron intensity profiles were measured for the case of Laue diffraction inside the Borrmann fan. At low amplitudes of ultrasonic waves interference effects (diffraction intensity beatings) were observed. The observations were possible because of the uniform acoustic-field distribution through the whole bulk of the crystal. As distinct from the classical Shull experiments, wide analysing slits or position-sensitive detectors were used. To explain the results obtained, a modified theory for the spatial distribution of neutron diffraction intensities in the presence of acoustic excitation of the crystal is proposed. A good agreement between experiment and theory is obtained. At high amplitudes of ultrasonic waves the transition to kinematic scattering was not observed, despite the large strains in the crystalline lattice created by ultrasound. This could be connected with the formation of a superlattice having a standing wave period. A strong rise in the diffraction intensity and a sharp constriction of the neutron beam at the centre of the Borrmann fan were observed. This new effect could be used for the creation of ultrasound-controlled monochromators.

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来源期刊
自引率
11.10%
发文量
0
审稿时长
3 months
期刊介绍: Acta Crystallographica Section A: Foundations and Advances publishes articles reporting advances in the theory and practice of all areas of crystallography in the broadest sense. As well as traditional crystallography, this includes nanocrystals, metacrystals, amorphous materials, quasicrystals, synchrotron and XFEL studies, coherent scattering, diffraction imaging, time-resolved studies and the structure of strain and defects in materials. The journal has two parts, a rapid-publication Advances section and the traditional Foundations section. Articles for the Advances section are of particularly high value and impact. They receive expedited treatment and may be highlighted by an accompanying scientific commentary article and a press release. Further details are given in the November 2013 Editorial. The central themes of the journal are, on the one hand, experimental and theoretical studies of the properties and arrangements of atoms, ions and molecules in condensed matter, periodic, quasiperiodic or amorphous, ideal or real, and, on the other, the theoretical and experimental aspects of the various methods to determine these properties and arrangements.
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