US-France Cooperative Research: Nuclear Spin Dynamics in Solid and Liquid Helium Three

美法合作研究：固液氦三中的核自旋动力学

• 批准号: 8815199
• 负责人: Pradeep Kumar
• 金额: $ 1.45万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-01 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8815199&HistoricalAwards=false
• 关键词: US; France; Cooperative; Research; Nuclear

This award will support cooperative research between Dr. Pradeep Kumar, University of Florida and Dr. Maurice Chapellier, Laboratoire de Physique des Solides, Orsay, France. The investigators propose to study the dynamics of nuclear spins in a quantum fluid or solid. Specifically, the research will focus on the following three problems: (1) Polarized pure and dilute __________________________ liquid. The investigators plan to study the spin-lattice ______ relaxation time T1 and distinguish between the role of bulk and various surface mechanisms. They will also investigate the viscosity and sound attenuation as a function of the polarization. (2) The solid/liquid interface: The principal problems include the __________________________ details of the crystallization process, as well as the transfer of magnetic energy across the interface. The precise nature of the solid and the liquid near a wall has a critical bearing on these questions and will also be studied. (3) Low density solid helium _________________________ three: In both bulk and constrained geometry, the investigators _____ propose a precision study of the anomalous susceptibility to test the polaron model and to investigate the relaxation induced by vacancies in general. Both the U.S. and French investigators have extensive research experience in the area of quantum fluids and solids, and in particular liquid and solid helium three. The results of this research will contribute to the understanding of the properties of quantum liquids and solids systems, which is of basic importance to condensed matter physics.

该奖项将支持Pradeep博士与 库马尔，佛罗里达大学和莫里斯查佩利耶博士， 法国奥赛固体物理学实验室。 的 研究人员建议研究核自旋的动力学， 量子流体或固体。 具体而言，研究将侧重于 以下三个问题：（1）极化纯和稀 __________________________ 液体 研究人员计划研究自旋晶格 ______ 弛豫时间T1和区分散装和 各种表面机制。 他们还将调查 粘度和声衰减作为极化的函数。 (2)固/液界面：主要问题包括： __________________________ 结晶过程的细节，以及 界面上的磁能 的确切性质 固体和液体附近的墙壁有一个关键的关系，这些 问题，并将进行研究。 (3)低密度固态氦 _________________________ 第三：在散装和约束几何形状中，研究人员 _____ 提出了一个异常敏感性的精确研究测试 极化子模型，并研究弛豫引起的 一般的空缺。 美国和法国的调查人员都进行了广泛的研究 量子流体和固体领域的经验， 特别是液态和固态氦三。 的结果 研究将有助于了解的性质， 量子液体和固体系统，这是基本的重要性， 凝聚态物理学