RUI: Studies of Nucleon Structure at Jefferson Lab

现在一个公认的事实是，核子（质子和中子）是由更基本的成分组成的：夸克和胶子。该奖项支持的研究项目旨在研究核子的内部结构。更具体地说，pi和他们的学生团队将在杰斐逊实验室散射质子和中子中的电子，以测量核子的电和磁特性，这代表了夸克和胶子在核子内部的位置。该小组通过设计新的实验，建造先进的粒子探测器，开发新的分析，建模和数据采集软件，为这些努力做出了贡献。pi为本科生和研究生提供有意义的、实质性的项目。pi在这些具有挑战性的项目中指导学生，为学生的STEM职业生涯做好准备。这个小组长期建立的实验项目体现了杰斐逊实验室的基本使命：阐明质子、中子和介子的基本结构。他们专注于实验，将进一步我们的理解夸克自旋结构的质子和中子在非摄动制度。随着该项目使用杰斐逊实验室最近委托的12gev电子束向前推进，该小组准备利用增加的物理范围。在杰斐逊实验室，质子和中子电磁形状因子的测量将继续延伸到最高的动量转移，并研究核介质中质子形状因子比的可能修改。这些实验为现有的核子结构理论模型提供了强有力的检验，同时也为基于量子色动力学（QCD）的新的更先进的模型的发展提供了动力。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

It is now a well-established fact that nucleons (protons and neutrons) are made up of more elementary constituents: quarks and gluons. The research program supported by this award aims to study the internal structure of nucleons. More specifically, the PIs and their team of students will scatter electrons from protons and neutrons at Jefferson Laboratory to measure the electric and magnetic properties of the nucleon, which represent where the quarks and gluons are inside the nucleons. This group contributes to these efforts through the design of new experiments, the construction of advanced particle detectors, and the development of novel analysis, modeling, and data acquisition software. The PIs provide meaningful, substantive projects to both undergraduate and graduate students. The PIs’ mentoring of the students in these challenging projects prepares the students for STEM careers.This group’s long-established program of experiments embody Jefferson Lab’s fundamental mission: to elucidate the underlying structure of protons, neutrons, and mesons. They focus on experiments that will further our understanding of the quark spin structure of the proton and neutron in the non-perturbative regime. As this program moves forward using Jefferson Lab’s recently commissioned 12 GeV electron beam, this group is poised to take advantage of the increased physics reach. The PIs continue to lead efforts to extend the measurements of the proton and neutron electromagnetic form factors to the highest momentum transfers possible at Jefferson Lab, and also investigate possible modification of the proton form factor ratio within the nuclear medium. These experiments provide strong tests of the available theoretical models of nucleon structure, and at the same time serve as an impetus for the development of new and more advanced models based on Quantum Chromo-Dynamics (QCD).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.