Investigations in Intermediate Energy Physics

中能物理研究

• 批准号: 1101234
• 负责人: Abdellah Ahmidouch
• 金额: $ 22.4万
• 依托单位: North Carolina Agricultural & Technical State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1101234&HistoricalAwards=false
• 关键词: Investigations; Intermediate; Energy; Physics

This award supports research activities by the nuclear physics group at North Carolina A&T State University (NCA&T) on two experimental programs to be carried out at Jefferson Lab, the Moller experiment and the Nucleon form factor program. The Moller experiment measures the parity-violating asymmetry (Apv) in the scattering of longitudinally polarized 11-GeV electrons off the atomic electrons in a liquid hydrogen target (Moller scattering). The expected precision on the measured parity-violating asymmetry (Apv) is 0.73 part per billion. This very high accuracy measurement will help precisely determine the fundamental quantity for the standard model, the weak mixing angle. This measurement can complement potential discoveries at the Large Hadron Collider (CERN), which explore new physics beyond the Standard Model. The nucleon Form Factor (FF) program is dedicated to the measurement of the neutron electromagnetic form factor ratio GEn/GMn in double polarized, quasi-elastic 3He(e,e'n)pp scattering at momentum transfers Q2 of 5-10.2 (GeV/c)2, and the neutron to the proton magnetic form factor ratio GMn/GMp in quasi-elastic scattering off the deuteron at Q2 up to 18 (GeV/c)2. Elastic electromagnetic Form factors of the nucleon (proton or neutron) provide key information on the structure and composition nature of the nucleon, as well as on the dynamics of its basic constituents, i.e. quarks and gluons. A detailed and systematic study of the structure of the nucleon is of paramount importance for the understanding of nuclear matter. The NCA&T group will take a leading role in designing and building a pion detector for the Moller experiment. The detector will determine the asymmetry of the pion background, which is essential to controlling the systematical error on the measured asymmetry Apv. For the FF program, the group will build a timing scintillator hodoscope needed for the reconstruction of the time-of-flight of the nucleon. The group will participate in the detector and software development effort, simulation, data taking and data analysis for the two programs. Undergraduate and graduate students will play a major role in all these activities.North Carolina A&T State University is a historically black university (HBCU). Ninety percent of the student population is African American. These students have been traditionally underrepresented in physics. This research program will provide them with unique research opportunities in experimental nuclear physics, and therefore will have a strong impact on their training and education. The program is highly interdisciplinary. It includes work with both hardware and software i.e., electronics, nuclear detector systems, optics, computer simulation, data acquisition, and data analysis. This award will help train and support two undergraduate and one graduate students each year. Students will be exposed to state-of-the-art facilities, will use cutting-edge equipment, and will interact with scientists from other national and international universities. In this respect, this research program will be very effective in attracting African Americans and other under-represented groups to advanced degrees in physics and engineering, and will, therefore, contribute to greater diversity in the field of nuclear physics.

该奖项支持北卡罗来纳州AT州立大学（NCA T）的核物理小组在杰斐逊实验室进行的两个实验计划，即穆勒实验和核子形状因子计划的研究活动。莫勒实验测量了纵向极化的11-GeV电子与液氢靶中原子电子的散射（莫勒散射）中的宇称违反不对称性（Apv）。测量的宇称违反不对称性（Apv）的预期精度为十亿分之0.73。这种非常高精度的测量将有助于精确地确定标准模型的基本量，即弱混合角。这种测量可以补充大型强子对撞机（CERN）的潜在发现，这些发现探索了标准模型之外的新物理学。核子形状因子（FF）计划致力于测量在动量转移Q2为5-10.2（GeV/c）2的双极化准弹性3 He（e，e 'n）pp散射中的中子电磁形状因子比GMn/GMn，以及在Q2高达18（GeV/c）2的准弹性散射中的中子与质子磁形状因子比GMn/GMp。核子（质子或中子）的弹性电磁形状因子提供了关于核子的结构和组成性质以及其基本成分（即夸克和胶子）的动力学的关键信息。 详细而系统地研究核子的结构对于理解核物质是至关重要的。NCA T小组将在为莫勒实验设计和建造π介子探测器方面发挥主导作用。探测器将确定π介子背景的不对称性，这对于控制测量的不对称性Apv上的系统误差至关重要。对于FF计划，该小组将建立一个重建核子飞行时间所需的计时闪烁体hodoscope。该小组将参与这两个项目的探测器和软件开发工作、模拟、数据采集和数据分析。本科生和研究生将在所有这些活动中发挥主要作用。北卡罗来纳州A T州立大学是一所历史悠久的黑人大学（HBCU）。90%的学生是非洲裔美国人。传统上，这些学生在物理学方面的代表性不足。该研究计划将为他们提供实验核物理学的独特研究机会，因此将对他们的培训和教育产生重大影响。该计划是高度跨学科的。它包括硬件和软件的工作，即，电子学、核探测器系统、光学、计算机模拟、数据采集和数据分析。该奖项将帮助培训和支持每年两名本科生和一名研究生。学生将接触到最先进的设施，将使用尖端设备，并将与来自其他国家和国际大学的科学家互动。在这方面，该研究计划将非常有效地吸引非裔美国人和其他代表性不足的群体攻读物理和工程高级学位，因此将有助于核物理领域的更大多样性。