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Diamond powders as neutron filters

机译：金刚石粉末作为中子过滤器

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Low-energy band-pass filters are essential components for many neutron-scattering measurements, particularly cold-neutron inelastic scattering. There has been widespread use of polycrystalline Be filters for typical cutoff energies near 5meV. The need to cool the filters to minimize thermal diffuse scattering is inconvenient for many experiments and for this reason we have investigated alternatives. Polycrystalline diamond appears to be an excellent candidate, with the large Debye temperature reducing the need for cooling, an abundant supply of inexpensive material, and a large scattering length density. Using the ORELA pulsed neutron source and the HFIR at ORNL, we have characterized the energy dependence of the room temperature neutron transmission for several commercially available powders of both natural and artificial diamond with homogeneous particle sizes ranging from single digits to hundreds of microns. Sharp cutoffs are observed near neutron energies of 5meV. The low-energy transmission is reduced by small-angle scattering from voids, and we have begun to investigate methods of overcoming this limitation. Nevertheless, for some applications room temperature diamond powders are viable neutron filters. Published by Elsevier B.V.
机译：对于许多中子散射测量，特别是冷中子非弹性散射，低能带通滤波器是必不可少的组件。多晶Be滤波器已经广泛用于接近5meV的典型截止能量。对于许多实验而言，冷却过滤器以最小化热扩散散射的需求是不便的，因此，我们研究了替代方法。多晶金刚石似乎是一个极好的候选者，大的德拜温度降低了冷却的需要，廉价材料的大量供应以及大的散射长度密度。使用ORELA脉冲中子源和ORNL的HFIR，我们已经表征了几种天然市售的天然和人造金刚石粉末的室温中子传输的能量依赖性，这些粉末的均一粒径从几位到几百微米不等。在5meV的中子能量附近观察到急剧的截止。低能传输因空隙中的小角度散射而降低，我们已经开始研究克服此限制的方法。然而，对于某些应用，室温金刚石粉末是可行的中子过滤器。由Elsevier B.V.发布

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