Neutron laue diffraction in a weakly deformed crystal at the Bragg angles close to ¦Ð/2

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• 作者：V. V. Fedorov (1)
  I. A. Kuznetsov (1)
  E. G. Lapin (1)
  S. Yu. Semenikhin (1)
  V. V. Voronin (1) vvv@mail.pnpi.spb.ru
• 关键词：PACS numbers 14.20.Dh ; 61.12.Gz
• 刊名：JETP Letters
• 出版年：2007
• 出版时间：March 2007
• 年：2007
• 卷：85
• 期：1
• 页码：82-85
• 全文大小：160.1 KB

文摘

An essential magnification of an external force acting on a diffracting neutron for the Bragg angles θ_B close to the right one is observed. Any external action (caused by either crystal deformation or external force affected the neutron) results in a bend of the so called “Kato trajectories” inside the crystal and, for the case of a finite crystal, gives considerable variation of the intensities of both diffracted neutron beams (direct and reflected). It is shown that the magnification factor is proportional to tan2 (θ_b) and can reach (102−103) for Bragg angles surfficiently close to 90¡ã.