THE TRANSMISSION OF SLOW NEUTRONS THROUGH MICROCRYSTALLINE MATERIALS
THE TRANSMISSION OF SLOW NEUTRONS THROUGH MICROCRYSTALLINE MATERIALS
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DOI：
10.1103/physrev.71.589
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发表时间：
1947-01-01
期刊：
影响因子：
--
通讯作者：
SACHS, RG
中科院分区：
文献类型：
--
作者：
FERMI, E;STURM, WJ;SACHS, RG
测定了单色慢中子在微晶Be和BeO中的透射率。中子源是阿贡重水堆。这些中子被单色化的手段是机械速度选择器的低能量和中子晶体谱仪的更高的能量。计算结果与晶体弹性散射理论符合得很好。通过与理论计算结果的比较，发现Be和O的散射振幅具有相同的符号。该方法可用于确定可结合以形成结晶材料的其他核对的相对散射相。样品必须由线性尺寸小于1微米的晶体组成。理论和实验之间的其他可能的分歧来源将在第5节中讨论。
The transmission of monochromatic slow neutrons through microcrystalline Be and BeO has been determined. The source of neutrons was the Argonne heavy water pile. These neutrons were monocromatized by means of a mechanical velocity selector for low energies and a neutron crystal spectrometer for higher energies. The results are in excellent agreement with the theory of elastic scattering from crystals. It is found by comparison of the results on BeO with the theory that the scattering amplitudes of Be and O have the same sign. This method may be used to determine the relative scattering phases of other pairs of nuclei which can be combined to form a crystalline material. The sample must consist of crystals smaller than a micron in linear dimensions. Other possible sources of disagreement between theory and experiment are discussed in Section 5.