Parity Nonconservation in Ytterbium

镱宇称不守恒

• 批准号: 0457086
• 负责人: Dmitry Budker
• 金额: --
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-03-15 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0457086&HistoricalAwards=false
• 关键词: Parity; Nonconservation; Ytterbium

Abstract for Ytterbium Parity Nonconservation Experiment Much of fundamental physics can be understood through considering underlying symmetries that interactions possess. One such symmetry is that of mirror reflection. Does a mirror reflection change the interaction, or, equivalently, do left-handed and right-handed particles interact in the same way? Most fundamental interactions, such as gravity, electromagnetic, and nuclear strong interactions, are the same under mirror reflection. This symmetry allows one to make predictions on what kind of physics processes are possible. However, there is a fundamental interaction due to the weak force, the force responsible for certain kinds of nuclear radioactive decay, which is not the same for left-handed and right-handed particles. The fact that it is the only force that does not possess mirror-reflection symmetry allows one to distinguish it from other, stronger interactions. Our work is focused on using high-precision laser spectroscopy techniques to study mirror-reflection symmetry of atoms. This understanding will allow us to learn about the fundamental processes inside the nucleus and between the nucleus and atomic electrons due to the weak interaction. This improved knowledge will provide a stringent test of our understanding of the fundamental building blocks of nature and help to clarify our understanding of nuclear and particle physics.

镱宇称不守恒实验许多基础物理可以通过考虑相互作用所具有的潜在对称性来理解。其中一种对称就是镜面反射。镜面反射是否改变了相互作用，或者，同样地，左旋粒子和右旋粒子是否以同样的方式相互作用？大多数基本的相互作用，如引力、电磁和核强相互作用，在镜面反射下是相同的。这种对称性使人们能够预测什么样的物理过程是可能的。然而，由于弱力，存在一种基本的相互作用，这种力负责某些类型的核放射性衰变，这对于左旋和右旋粒子是不一样的。它是唯一不具有镜像对称的力，这一事实使人们能够将它与其他更强的相互作用区分开来。我们的工作重点是利用高精度激光光谱学技术研究原子的镜像反射对称性。这种理解将使我们能够了解原子核内部以及原子核与原子电子之间由于弱相互作用而发生的基本过程。这种改进的知识将为我们对自然界基本组成部分的理解提供严格的测试，并有助于澄清我们对核物理和粒子物理的理解。