U.S.-U.K. Cooperative Research: Momentum Distributions in Quantum Liquids

这个为期三年的奖项支持美国-英国合作研究 Paul A.之间的凝聚态物理学。宾夕法尼亚州的索科尔 州立大学和William G.斯特林的大学 Keele in Staffordshire，英国. 调查人员 建议进行一系列的中子散射调查， 量子液体 合作将利用 ISIS（卢瑟福）上独特的中子散射仪器 阿普尔顿实验室）和IPNS脉冲中子源 （阿贡国家实验室）。 他们将研究这样的系统， 量子效应主导微观特性，以及 液态氦的终态效应，液态氦的性质， 氦混合物和限制几何形状对 液态氦的动量分布 美国及 英国研究人员将他们的实验性 专业知识，并将共同进行与他们的学生， 测量和数据分析。英国乐器有 测量动量分布的能力， 量子液体 这将通过温度来补充， 阿贡号上的压力和浓度测量 光谱仪 液氦是超导性的重要元素。 量子效应主导了氦的凝聚态 阶段，并负责其独特的属性，如 超流性 通过对动量分布的研究， 调查人员将获得独特的视角和重要的洞察力， 这些系统的微观动力学。 拟议联合 研究代表了对动量的详细调查 在液体中的分布，并将大大增加我们的 知识

This three-year award supports U.S.-U.K. cooperative research in condensed matter physics between Paul A. Sokol of Pennsylvania State University and William G. Stirling of the University of Keele in Staffordshire, United Kingdom. The investigators propose to conduct a series of neutron scattering investigations of quantum liquids. The collaboration will take advantage of unique neutron scattering instrumentation at ISIS (Rutherford Appleton Laboratory) and the IPNS pulsed neutron sources (Argonne National Laboratory). They will study systems where quantum effects dominate the microscopic properties, as well as the final state effects in liquid helium, the properties of liquid helium mixtures and the effects of restricted geometries on the momentum distribution of liquid helium. Both the U.S. and British investigators bring to this collaboration their experimental expertise and will jointly conduct with their students the measurements and the data analysis. The British instrument has the capabilities for measuring momentum distributions in quantum liquids. This will be complemented by temperature, pressure and concentration measurements on the Argonne spectrometer. Liquid helium is an important element in superconductivity. Quantum effects dominate the behavior in helium's condensed phases and are responsible for its unique properties such as superfluidity. Through studies of momentum distribution, the investigators will gain a unique view and significant insight into the microscopic dynamics of these systems. The proposed joint studies represent detailed investigations of momentum distribution in liquids and will add substantially to our knowledge.