Meson Physics at Arizona State University

亚利桑那州立大学介子物理学

• 批准号: 0653630
• 负责人: Barry Ritchie
• 金额: $ 48万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0653630&HistoricalAwards=false
• 关键词: Meson; Physics; Arizona; State; University

This project will use high energy photons to probe the internal structure of the protons and neutrons (together called "nucleons") making up atomic nuclei. Nucleons themselves are composite systems of quarks, and have an excitation spectrum that can provide clues as to how those quarks interact with each other. Three unique and powerful capabilities of Jefferson Lab will be used: (1) The CLAS detector at Jefferson Lab, (2) a "frozen spin" target in which the spins of the nucleons are aligned, and (3) a photon beam where the photon spins are also aligned, the decays of these excited states will be studied based on the relative orientations of the different spins to provide critical information about each of the excited states observed in order to provide stringent tests for quark models of the nucleon. The project is explicitly designed to involve undergraduate and graduate students in all aspects of the experiments. In addition to obtaining an in-depth understanding of experimental subatomic physics, these students will also learn complex computer programming skills working with an international collaboration operating the most complex detector ever built for nuclear physics research. As students master various aspects of the project, they will also develop leadership and communication skills working with teams of scientists.

该项目将使用高能光子来探测构成原子核的质子和中子（统称为“核子”）的内部结构。核子本身是夸克的复合系统，并且具有激发光谱，可以提供有关这些夸克如何相互作用的线索。将使用杰斐逊实验室的三种独特而强大的功能：(1) 杰斐逊实验室的 CLAS 探测器，(2) 核子自旋对齐的“冻结自旋”目标，以及 (3) 光子束，其中核子的自旋对齐。光子自旋也对齐，将根据不同自旋的相对方向研究这些激发态的衰变，以提供有关观察到的每个激发态的关键信息，从而为核子夸克模型提供严格的测试。该项目的明确设计目的是让本科生和研究生参与实验的各个方面。除了深入了解实验亚原子物理学之外，这些学生还将学习复杂的计算机编程技能，与国际合作组织合作，操作有史以来为核物理研究建造的最复杂的探测器。当学生掌握该项目的各个方面时，他们还将培养与科学家团队合作的领导能力和沟通技巧。