Effect of anomalous absorption of neutrons undergoing Laue diffraction at Bragg angles close to π/2

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• 作者：E. O. Vezhlev (12) vezhlev@pnpi.spb.ru
  V. V. Voronin (1)
  I. A. Kuznetsov (1)
  S. Yu. Seminikhin (1)
  V. V. Fedorov (12)
• 刊名：JETP Letters
• 出版年：2012
• 出版时间：September 2012
• 年：2012
• 卷：96
• 期：1
• 页码：1-5
• 全文大小：262.2 KB
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• 作者单位：1. Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia2. St. Petersburg State Polytechnical University, Politekhnicheskaya ul. 29, St. Petersburg, 195251 Russia
• ISSN：1090-6487

文摘

A direct experimental observation of the anomalous absorption of neutrons undergoing Laue diffraction in a highly perfect silicon single crystal of size about 200 mm at Bragg angles close to π/2 is reported. It is shown that, in the case of diffraction at the (220) plane, the neutron absorption length may be several meters, which is nearly one order of magnitude longer than the mean absorption length for neutrons of the same wavelength. This circumstance makes it possible to study effects accompanying Laue diffraction at Bragg angles of up to 88° and a crystal size of about 200 mm.