首页> 外文会议>The 3rd International Symposium on Material Chemistry in Nuclear Environment (Material Chemistry '02 MC'02) Mar 13-15, 2002 Tsukuba >POSITRON ANNIHILATION STUDIES ON BULK METALLIC GLASS AND HIGH INTENSITY POSITRON BEAM DEVELOPMENTS
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POSITRON ANNIHILATION STUDIES ON BULK METALLIC GLASS AND HIGH INTENSITY POSITRON BEAM DEVELOPMENTS

机译:大块金属玻璃的正电子AN没与高强度正电子束的发展

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摘要

Positron annihilation spectroscopy is an ideal probe to examine atomic scale open-volume regions in materials. Below, we summarize the recent results on studies of open-volume regions of a multicomponent Zr-Ti-Ni-Cu-Be bulk metallic glass. Our studies establish two types of open-volume regions, one group that is too shallow to trap positrons at room temperature and becomes effective only at low temperatures and the other group that localizes positrons at room temperature and is large enough to accommodate hydrogen. The second half of the paper will concentrate on the high intensity positron program at Lawrence Livermore National Laboratory. A new positron production target is under development and we are constructing two experimental end stations to accommodate a pulsed positron microprobe and an experiment on positron diffraction and holography. Important design considerations of these experiments will be described.
机译:正电子an没光谱法是检查材料中原子级开放体积区域的理想探针。下面,我们总结了有关多组分Zr-Ti-Ni-Cu-Be大块金属玻璃的开孔区域研究的最新结果。我们的研究建立了两种类型的开放体积区域,一组区域太浅而无法在室温下捕获正电子,并且仅在低温下才有效;另一组区域在室温下定位正电子,并且足够容纳氢。本文的后半部分将重点介绍劳伦斯·利弗莫尔国家实验室的高强度正电子计划。一个新的正电子生产目标正在开发中,我们正在建设两个实验终端站,以容纳脉冲正电子微探针以及正电子衍射和全息图的实验。将描述这些实验的重要设计注意事项。

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