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

RUI：杰斐逊实验室使用电磁探针研究核子结构

• 批准号: 1208056
• 负责人: Edward Brash
• 金额: $ 55.5万
• 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: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1208056&HistoricalAwards=false
• 关键词: RUI; Studies; Nucleon; Structure; Using

One of the primary goals of experiments at the Jefferson Laboratory (JLab) is to elucidate the underlying structure of hadrons - protons, neutrons, and mesons. Our group's long established program of experiments at the laboratory - past, present, and future - embody this goal. We focus on experiments which will further our understanding of the quark spin structure of the proton in the non-perturbative regime. Moreover, the longer term future of JLab is focused on an upgrade of the maximum electron energy of the facility to 12 GeV, and the CNU group is actively involved in this effort. For example, we will continue to lead the efforts to extend the measurement of the proton electromagnetic form factor ratio to the highest momentum transfers possible at JLab, 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). In addition, in Hall B at JLab, we are involved in a program of experiments to map out the spin structure of the nucleon through the measurements of the semi-inclusive electroproduction of pions and kaons. Consistent with the goals of the RUI program, education of undergraduates and masters-level graduate students is a central component of this project. We will continue to engage in software development efforts at JLab; this is a continuation of work that we have been involved in for many years. Due to the nature of these efforts, we anticipate that we can involve computer science and computer engineering students, as well as our physics students. Indeed, our projects will provide excellent training for our students in the areas of programming, modeling, analysis techniques, and in critical judgment. Finally, we have demonstrated that our physics program at Jefferson Lab provides an exciting opportunity to expose our undergraduates to the field of nuclear physics, and that our students do continue on to graduate study in the field.

杰斐逊实验室 (JLab) 实验的主要目标之一是阐明强子（质子、中子和介子）的基本结构。 我们小组长期以来在实验室制定的实验计划——过去、现在和未来——体现了这一目标。 我们专注于实验，这将进一步加深我们对非微扰状态下质子的夸克自旋结构的理解。 此外，JLab 的长远未来重点是将设施的最大电子能量升级至 12 GeV，CNU 团队也积极参与这项工作。 例如，我们将继续领导将质子电磁形状因数比的测量扩展到 JLab 可能的最高动量传递，并研究核介质内这种形状因数比的可能修改。 这些实验将对现有的质子结构理论模型进行严格的测试，并将有力地推动基于量子色动力学（QCD）的更先进模型的发展。 此外，在 JLab 的 B 厅，我们参与了一项实验计划，通过测量介子和介子的半包容电产生来绘制核子的自旋结构。与 RUI 项目的目标一致，本科生和硕士研究生的教育是该项目的核心组成部分。 我们将继续在JLab从事软件开发工作；这是我们多年来参与的工作的延续。由于这些努力的性质，我们预计我们可以让计算机科学和计算机工程专业的学生以及物理专业的学生参与进来。 事实上，我们的项目将为我们的学生在编程、建模、分析技术和批判性判断方面提供出色的培训。 最后，我们证明了杰斐逊实验室的物理项目为我们的本科生接触核物理领域提供了令人兴奋的机会，并且我们的学生确实继续在该领域进行研究生学习。