RUI: Studies of Nucleon Structure Using Electromagnetic Probes at Jefferson Lab

RUI：杰斐逊实验室使用电磁探针研究核子结构

• 批准号: 1506172
• 负责人: Edward Brash
• 金额: $ 49.5万
• 依托单位: Christopher Newport University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-15 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1506172&HistoricalAwards=false
• 关键词: RUI; Studies; Nucleon; Structure; Using

It is now a well-established fact that nucleons, protons and neutrons, are made up of more elementary particles called quarks. The main physics program supported by this grant aims to study of the structure of the proton. More specifically, we scatter electrons from protons at Jefferson Laboratory to measure the electric and magnetic properties of the proton. Our group is involved in these efforts through the design of new experiments, the construction of advanced particle detectors, and the development of novel analysis and modeling software. We involve students by providing meaningful, substantive projects to both undergraduate and graduate students. Our group's long established program of experiments embody Jefferson Lab's primary mission: to elucidate the underlying structure of protons, neutrons, and mesons. We focus on experiments which will further our understanding of the quark spin structure of the proton in the non-perturbative regime. Jefferson Lab has recently completed an upgrade to electron beams of energy 12 GeV, and our group is now poised to take advantage of the increased physics reach. We continue to lead the efforts to extend the measurement of the proton electromagnetic form factor ratio to the highest momentum transfers possible at Jefferson Lab, and also investigate the possible modification of this form factor ratio within the nuclear medium. These experiments will provide severe tests of the available theoretical models of proton structure, and will serve as a strong impetus for the development of more advanced models based upon quantum chromodynamics (QCD).

现在，核子，质子和中子是由更基本的颗粒组成的，这是一个公认的事实。该赠款支持的主要物理计划旨在研究质子的结构。 更具体地说，我们将电子从杰斐逊实验室的质子散射，以测量质子的电和磁性。 我们的小组通过设计新实验，高级粒子探测器的构建以及新颖的分析和建模软件的开发参与了这些工作。我们通过为本科生和研究生提供有意义的实质性项目来参与学生。我们小组长期建立的实验计划体现了杰斐逊实验室的主要任务：阐明质子，中子和介子的潜在结构。我们专注于实验，这将进一步了解非扰动制度中质子的夸克自旋结构。杰斐逊实验室（Jefferson Lab）最近完成了对Energy 12 GEV的电子束的升级，现在我们的小组准备好利用物理范围增加。我们继续领导努力将质子电磁型因子比率扩展到杰斐逊实验室可能的最高动量转移，并研究了核培养基内此形态比率的可能修饰。这些实验将对质子结构的可用理论模型提供严格的测试，并将成为基于量子染色体动力学（QCD）开发更先进模型的强大动力。