Investigations in Intermediate Energy Physics

现在一个公认的事实是，核子、质子和中子是由更基本的粒子——夸克组成的。在这个项目中进行的测量将导致对核子结构的更好理解，以及对以相对论速度运动的束缚夸克的影响的更好理解。特别是，提出的测量将用于提取质子和中子的详细径向电荷分布，并将更好地理解如何解释原子核上的电子散射实验数据。该项目将培训和支持本科生和研究生，其中大多数是少数民族学生。这个项目是高度跨学科的。它包括硬件和软件的工作，即电子、核探测系统、光学、计算机模拟和数据分析。参与该计划的学生将在最先进的设施中工作，并与来自其他国家认可的大学的科学家互动。这些研究活动将对学生的培训产生重大影响，为他们进入21世纪的STEM劳动力做好准备。这笔拨款用于支持北卡罗来纳农工州立大学两个项目的研究活动。第一个是位于杰弗逊实验室A厅的核子形状因子（FF）项目，该项目致力于测量3He双极化准弹性散射下的中子电磁形状因子比，以及氘核准弹性散射下的中子磁性形状因子，两者都是在高动量传递下。二是在杰弗逊实验室C厅通过反冲偏振法测量氘靶高动量转移时的中子电形态因子。核子（质子或中子）的弹性电磁形状因子提供了有关核子的结构和组成性质以及夸克和胶子动力学的关键信息。对于FF计划，该小组将为气环成像切伦科夫计数器建立一个光子探测器阵列。对于C厅的实验，该小组正在建造偏振计计数器和Delta-E探测器阵列，用于从偏振计分析仪中的中子散射事件中识别反冲质子。

It is now a well-established fact that nucleons, protons and neutrons, are made up of more elementary particles called quarks. The measurements that will be carried out within this project will lead to a better understanding of nucleon structure and a better understanding of the effects of bound quarks moving at relativistic velocities. In particular, the proposed measurements will be used to extract detailed radial charge distributions of the proton and neutron, and will lead to a better understanding of how to interpret data from electron scattering experiments on nuclei. This project will train and support both undergraduate and graduate students, most of whom are minority students. The program is highly interdisciplinary. It includes work with both hardware and software i.e., electronics, nuclear detector systems, optics, computer simulation, and data analysis. Students engaged in the program will work in a state-of-the-art facility and interact with scientists from other nationally recognized universities. These research activities will significantly impact the training of the students, preparing them for entering the STEM workforce of the 21st century.This grant is to support research activities at North Carolina A&T State University on two programs. The first is the nucleon Form Factors (FF) program in Hall A at Jefferson Lab which is dedicated to the measurement of the neutron electromagnetic form factor ratio in double polarized, quasi-elastic scattering on 3He, and separately the neutron magnetic form factor in quasi-elastic scattering off the deuteron, both at high momentum transfer. The second is to measure the neutron Electric Form Factor at high momentum transfer from a deuterium target via recoil polarimetry in Hall C at Jefferson Lab. Elastic electromagnetic Form factors of the nucleon (proton or neutron) provide key information on the structure and the composition nature, of the nucleon, and the dynamics of quarks and gluons. For the FF program the group will build a photon detector array for the Gas Ring Imaging Cherenkov counter. For the experiment of Hall C, the group is building the polarimeter veto counters and the Delta-E detector arrays that identify the recoil proton from the neutron scattering events in the polarimeter analyzer.