MRIConsortium: Development of a Neutral Particle Spectrometer to Investigate the Quark Structure of the Proton at JLab 12 GeV

获得强束缚系统性质的定量描述对于我们理解物质的基本结构和起源具有重要意义。揭示包含质子和中子的原子核的内部结构，并了解将这些核物理最基本元素结合在一起的动力学，是推进这一知识的重要组成部分。该项目旨在进行前沿研究，以建造对确认质子结构的理解至关重要的中性粒子光谱仪。该计划使杰斐逊国家加速器设施的多方面实验物理计划成为可能，其中PI发挥了主导作用。博士后研究人员，研究生和本科生的参与是该项目的一个组成部分，有助于美国技术劳动力的发展。全女性的项目领导将提供榜样，鼓励代表性不足的群体在物理或技术领域进行高级研究。分辨率磁谱仪提供了独特的科学能力，通过与中性粒子的反应，推动了核子横向空间和动量结构研究的能量尺度，需要精度高、亮度高。该系统允许精确测量所谓的硬排斥（反冲质子在高能电子-夸克散射过程中保持完整）和半包容（电子-夸克散射过程的能量损失主要被单个π介子或K介子吸收）散射过程。为了通过空间和动量成像提取关于质子结构的丰富信息，最重要的是在精确的测量中显示，推动能量尺度，理解散射过程。在这方面，用该仪器精确测量真实的光子或中性π介子具有独特的优势。该仪器将由美国天主教大学和俄亥俄州大学领导的研究人员组成的联合体合作建造。它还将包括旧自治领大学和作为非主要合作伙伴的杰斐逊实验室、北卡罗来纳州A T大学、埃里温物理研究所、U。和奥赛核物理研究所。

Gaining a quantitative description of the nature of strongly bound systems is of great importance for our understanding of the fundamental structure and origin of matter. Revealing the inner structure of the core of the atom that contains the protons and neutrons and understanding the dynamics that bind these most basic elements of nuclear physics is an essential part to advance this knowledge. This project is aimed at conducting leading-edge research to construct a neutral particle spectrometer (NPS) critical to confirm the understanding of the structure of the proton. The NPS enables a multifaceted experimental physics program at the Jefferson National Accelerator Facility, in which the PIs play a leading role. The participation of postdoctoral researchers, graduate students, and undergraduate students is an integral part of this project and contributes to the development of the technological work force in the USA. The all-female project leadership will provide role models that could encourage under-represented groups to pursue advanced studies in physics or technical fields.The two-arm combination of neutral-particle detection as provided by the NPS and a high-resolution magnetic spectrometer offers unique scientific capabilities to push the energy scale for studies of the transverse spatial and momentum structure of the nucleon through reactions with neutral particles requiring precision and high luminosity. The NPS allows accurate access to measurements of so-called hard exclusive (the recoiling proton stays intact in the energetic electron-quark scattering process) and semi-inclusive (the energy loss of the electron-quark scattering process gets predominantly absorbed by a single pion or kaon) scattering processes. To extract the rich information on proton structure through spatial and momentum imaging, it is of prime importance to show in accurate measurements, pushing the energy scales, that the scattering process is understood. Precision measurements of real photons or neutral-pions with the NPS offer unique advantages here. The instrument will be built by a collaboration of researchers forming a consortium led by the Catholic Univ. of America and Ohio Univ. It will also include the Old Dominion Univ. and as non-lead partners, the Jefferson Lab, North Carolina A&T University, the Yerevan Physics Institute, U. of Glasgow, and the Institute of Nuclear Physics at Orsay.