Investigations in Intermediate Energy Spin Physics
中能自旋物理研究
基本信息
- 批准号:0600960
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2006
- 资助国家:美国
- 起止时间:2006-09-01 至 2010-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This proposal will support the development, construction and execution of three highly rated experiments at Jefferson Lab. These include The SANE experiment E03-109, experiment E05-101, and the semi-SANE experiment E04-113. All three experiments will be conducted Jefferson Lab-Hall C, will use the same experimental setup and in all likelihood will run back to back. The experiments use the large acceptance BigCal spectrometer constructed by the GEP-III collaboration, the HMS spectrometer and the UVA polarized NH3 and LiD targets. Our group plans to build a Lucite Cerenkov hodoscope which is critical for background rejection and tracking. The group will also participate in the experiment software development effort, simulation, data taking and data analysis. Our students, the majority of whom are minority students, will play a major role in all these tasks. The SANE experiment measures inclusive spin asymmetries on the proton at large x, where valence quarks dominate and hence a relatively clean region to study the spin structure of the nucleon. The measured spin observables are fundamental for understanding QCD in that region. QCD is the quantum field theory that describes the properties of the strong interactions between quarks and between protons and neutrons in the framework of the quantum theory. The RCS experiment will measure, the initial state helicity correlation asymmetry in real Compton scattering to a statistical accuracy of 0.1. Compton Scattering is when gamma ray photons of a certain energy will bounce off electrons as they pass through matter, and see their energy decrease. The measurement will significantly increase our confidence in the application of the GPD approach to reactions induced by real photons. The generalized parton distributions (GPD's) extend the well-known Feynman parton distribution and electromagnetic form factors of the nucleon to new kinematic dimensions. In the forward limit, these distributions reduce to the Feynman parton distributions. On the other hand, the first moment of GPD's give the electromagnetic form factors. In general, the GPD's contain much richer structural information of the nucleon than conventional observables.Finally, precision data from the semi-SANE will significantly improve our knowledge of the flavor (type of quark) structure of the nucleon spin for both valence and sea quarks. The improved knowledge of the moments of the polarized quark distributions will provide stringent tests for theoretical models and Lattice QCD.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. The proposed 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. During previous years the group supported and supervised over twenty students most of whom were African Americans.
该提案将支持杰斐逊实验室三个高评价实验的开发、构建和执行。其中包括 SANE 实验 E03-109、实验 E05-101 和半 SANE 实验 E04-113。所有三个实验都将在 Jefferson Lab-C Hall C 进行,将使用相同的实验装置,并且很可能会连续运行。实验使用GEP-III合作构建的高接受度BigCal光谱仪、HMS光谱仪和UVA偏振NH3和LiD靶材。我们的小组计划建造一个 Lucite Cerenkov 视镜,这对于背景抑制和跟踪至关重要。该小组还将参与实验软件开发、模拟、数据采集和数据分析。我们的学生,其中大多数是少数民族学生,将在所有这些任务中发挥重要作用。 SANE 实验测量质子在大 x 处的包容性自旋不对称性,其中价夸克占主导地位,因此是研究核子自旋结构的相对干净的区域。测量的自旋可观测量对于理解该区域的 QCD 至关重要。 QCD是量子场论,描述了量子理论框架中夸克之间以及质子和中子之间强相互作用的性质。 RCS 实验将测量实际康普顿散射中的初始状态螺旋相关不对称性,统计精度为 0.1。康普顿散射是指特定能量的伽马射线光子在穿过物质时会被电子反弹,并看到它们的能量减少。该测量将显着增加我们对 GPD 方法应用于真实光子引起的反应的信心。广义部分子分布 (GPD) 将著名的费曼部分子分布和核子的电磁形状因子扩展到新的运动学维度。在前向极限中,这些分布简化为费曼帕顿分布。另一方面,GPD 的一阶矩给出了电磁形状因子。一般来说,GPD 包含比传统可观测值更丰富的核子结构信息。最后,来自半 SANE 的精确数据将显着提高我们对价夸克和海夸克核子自旋的风味(夸克类型)结构的了解。对极化夸克分布矩的进一步了解将为理论模型和格子量子色动力学提供严格的测试。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)。百分之九十的学生是非裔美国人。传统上,这些学生在物理学领域的代表性不足。拟议的研究计划将为他们提供实验核物理方面独特的研究机会,因此将对他们的培训和教育产生重大影响。在过去的几年里,该小组支持和监督了二十多名学生,其中大多数是非裔美国人。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Abdellah Ahmidouch其他文献
Abdellah Ahmidouch的其他文献
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{{ truncateString('Abdellah Ahmidouch', 18)}}的其他基金
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合作研究:AGEP 北卡罗莱纳州联盟:提高少数族裔 STEM 博士生和教师成功率的机构转型模型
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