RUI: Nucleon Structure Studies via Electron Scattering at JLab 12 GeV

RUI：在 JLab 12 GeV 上通过电子散射进行核子结构研究

• 批准号: 1812369
• 负责人: Peter Monaghan
• 金额: $ 24.28万
• 依托单位: Christopher Newport University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1812369&HistoricalAwards=false
• 关键词: RUI; Nucleon; Structure; Studies; via

It has been established that protons and neutrons (nucleons) have a substructure made up of elementary constituent particles called quarks and gluons. Quantum Chromodynamics (QCD) is an established theory of how these constituents interact giving rise to the strong nuclear force and the fundamental properties of nucleons. The research program supported by this grant is aimed at improving the fundamental understanding of nucleon structure. This goal will be achieved through electron scattering experiments to be performed at the Thomas Jefferson National Accelerator Facility (JLab). These experiments will measure the spatial distributions of electric charge and current in both the proton and the neutron; this information is encoded in the nucleon electromagnetic form factors. A fundamental understanding of the nucleon form factors in terms of QCD is one of the outstanding challenges in nuclear physics today. Why and how do quarks forms colorless hadrons with only two stable configurations, the proton and neutron? One important step towards addressing this challenge is to characterize the internal structure of the nucleon via form factor measurements. The anticipated research activities will cover a range of both hardware and software projects. These projects will provide outstanding research opportunities for undergraduate students, furthering their education outside the classroom, preparing them for a career in science, technology, engineering and mathematics (STEM) and laying the foundations for successful graduate studies.The funding support for this research program will enable the PI and Christopher Newport University students to contribute to a number of projects at JLab, aimed at improving the fundamental understanding of nucleon structure. The proposed projects include an experimental effort - the Super Bigbite Spectrometer program (SBS) - and a phenomenology effort - CTEQ-JLab (CJ) - both of which address fundamental questions of hadronic structure in the QCD framework. The SBS program comprises high impact experiments studying the electromagnetic form factors of both the proton and neutron at a much higher momentum transfer than previously studied. The new data from the SBS experiments will allow a partonic flavor decomposition of the form factors to be performed, which in turn can be tested using calculations provided by the CJ effort. The PI is leading the commissioning effort of one of the SBS detector systems, as well as contributing to the analysis effort in the CJ projectThis 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.

已经确定质子和中子（核子）具有由称为夸克和胶子的基本成分颗粒组成的亚条件。量子染色体动力学（QCD）是一种既定理论，说明这些成分如何相互作用产生强核力和核子的基本特性。该赠款支持的研究计划旨在改善对核子结构的基本理解。将通过电子散射实验在托马斯·杰斐逊国家加速器设施（JLAB）实现这一目标。这些实验将测量质子和中子中电荷和电流的空间分布。该信息编码在核子电磁形式因子中。从QCD方面，对核子形式的基本理解是当今核物理学的重要挑战之一。夸克为什么以及如何形成只有两个稳定构型质子和中子的无色黑龙？应对这一挑战的重要一步是通过外形因素测量表征核子的内部结构。预期的研究活动将涵盖一系列硬件和软件项目。 These projects will provide outstanding research opportunities for undergraduate students, furthering their education outside the classroom, preparing them for a career in science, technology, engineering and mathematics (STEM) and laying the foundations for successful graduate studies.The funding support for this research program will enable the PI and Christopher Newport University students to contribute to a number of projects at JLab, aimed at improving the fundamental understanding of nucleon structure.拟议的项目包括实验性的工作 - 超级凭证光谱仪计划（SBS）和现象学工作-CTEQ -JLAB（CJ） - 两者都涉及QCD框架中HADRONIC结构的基本问题。 SBS计划包括研究质子和中子的电磁形式因子的高影响实验，其动量转移比以前所研究的要高得多。来自SBS实验的新数据将允许执行形式因素的党派风味分解，进而可以使用CJ工作提供的计算进行测试。 PI领导了SBS探测器系统之一的调试工作，并为CJ Project Project奖的分析工作做出了贡献，这反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估标准来通过评估来获得支持的。

项目成果

High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A

杰斐逊实验室 A 厅的高分辨率超核光谱

• DOI: 10.1103/physrevc.99.054309
• 发表时间: 2019
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Garibaldi, F.;Acha, A.;Ambrozewicz, P.;Aniol, K. A.;Baturin, P.;Benaoum, H.;Benesch, J.;Bertin, P. Y.;Blomqvist, K. I.;Boeglin, W. U.
• 通讯作者: Boeglin, W. U.

Measurement of the generalized spin polarizabilities of the neutron in the low-Q2 region

低 Q2 区域中子广义自旋极化率的测量

• DOI: 10.1038/s41567-021-01245-9
• 发表时间: 2021
• 期刊: Nature Physics
• 影响因子: 19.6
• 作者: Sulkosky, Vincent;Peng, Chao;Chen, Jian-ping;Deur, Alexandre;Abrahamyan, Sergey;Aniol, Konrad A.;Armstrong, David S.;Averett, Todd;Bailey, Stephen J.;Beck, Arie
• 通讯作者: Beck, Arie

Proton form factor ratio \mu_p G_E^p/G_M^p from double spin asymmetry

来自双自旋不对称的质子形状因子比率 mu_p G_E^p/G_M^p

• 发表时间: 2020
• 期刊: Physical review
• 作者: Liyanage, A.;Armstrong, W.;Kang, H.;Maxwell, J.;Mulholland, J.;Ndukum, L.;Ahmidouch, A.;Albayrak, I.;Asaturyan, A.;Ates, O.
• 通讯作者: Ates, O.

Measurement of double-polarization asymmetries in the quasi-elastic He→3(e→,e′p) process

准弹性 He−3(e−,e−p) 过程中双极化不对称性的测量

• DOI: 10.1016/j.physletb.2018.10.063
• 发表时间: 2019
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Mihovilovič, M.;Jin, G.;Long, E.;Zhang, Y.-W.;Allada, K.;Anderson, B.;Annand, J.R.M.;Averett, T.;Bertozzi, W.;Boeglin, W.
• 通讯作者: Boeglin, W.

Measurement of structure dependent radiative K+ → e+νγ decays using stopped positive kaons

使用停止的正 kaons 测量结构依赖的辐射 K α γ 衰变

• DOI: 10.1016/j.physletb.2022.136913
• 发表时间: 2022
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Ito, H.;Kobayashi, A.;Bianchin, S.;Cao, T.;Djalali, C.;Dongwi, D.H.;Gautam, T.;Gill, D.;Hasinoff, M.D.;Horie, K.
• 通讯作者: Horie, K.