Probing the Weak and Strong Nature of the Nucleon

爱达荷州立大学（ISU）中能量核能小组（PI: Philip Cole和CoPIs: Tony Forest， Mahbub Khandaker和Dustin McNulty）将在杰斐逊实验室使用电磁和电弱探针进行测量，这将增强我们对核子和原子核的基本性质和对称性的理解。通过他们几次被批准和有条件批准的实验，他们提出在不同距离尺度上研究核子的夸克/胶子成分，测量质子的大小，并确定富中子核的结构。这个奖项是他们使用电磁和电弱探针探索核子和原子核中表达的强力和弱力的性质的工作的延续。例如，强作用力决定了夸克和胶子如何排列成核子，以及这些质子或中子随后如何结合成原子核。这个研究项目广泛地解决了强作用力和弱作用力的许多方面，即：当海夸克和胶子的贡献最小时，价夸克是如何自组装的，胶子如何附着在夸克上，使当前夸克的质量增加到组成夸克的质量，夸克如何在核子内部共振形成受激夸克的集合，弱力如何在夸克的电子散射中耦合，以及通过宇称破坏获得中子半径的精确数据。所有这些努力都需要一个团队，他们的工作重叠，协调当地资源和技能，并保持坚实的团队合作意识。此外，ISU小组还为JLab研究社区提供了很好的服务，包括建造、连接和测量class12区域1漂移室，以便将12gev升级到杰斐逊实验室。我们是密西西比河以西最大的JLab集团。

The Idaho State University (ISU) medium-energy nuclear-energy group (PI: Philip Cole and CoPIs: Tony Forest, Mahbub Khandaker, and Dustin McNulty) will perform measurements using electromagnetic and electroweak probes at Jefferson Lab that will enhance our understanding of the fundamental properties and symmetries in nucleons and nuclei. Through their several approved and conditionally-approved experiments, they propose to study the quark/gluon constituents of nucleons at various distance scales, measure the size of the proton, and ascertain the structure of neutron-rich nuclei. This award is a continuation of their work on using both electromagnetic and electroweak probes for exploring the nature of the strong force and the weak force expressed in nucleons and nuclei. The strong force, for example, is responsible for how quarks and gluons arrange themselves into nucleons and how these protons or neutrons subsequently bind into nuclei. This research program broadly addresses the many facets of both the strong and the weak force, namely: how valence quarks self assemble when sea quark and gluon contributions are minimal, the nature of how gluons attach to quarks serving to increase the mass of current quarks to that of constituent quarks, how quarks resonate inside the nucleon to form excited assemblies of quarks, how the weak force is coupled in electron scattering from quarks as well as garnering precise data on the neutron radius as evidenced through parity violation. All these dedicated efforts require a group, who overlap in their work, coordinate local resources and skills, and maintain a solid sense of teamwork. Further, the ISU group is providing a great service to the JLab research community in building, stringing, and instrumenting the CLAS12 Region 1 drift chambers for the 12 GeV upgrade to Jefferson Lab. We are the largest JLab group west of the Mississippi.