Probing the Weak and Strong Nature of the Nucleon

探究核子的弱与强性质

• 批准号: 1307340
• 负责人: Philip Cole
• 金额: $ 90万
• 依托单位: Idaho State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-01 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1307340&HistoricalAwards=false
• 关键词: Probing; Weak; Strong; Nature; Nucleon

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.

爱达荷州州立大学（ISU）的中能核能小组（PI：Philip科尔和CoPI：Tony Forest，Mahbub Khandaker和Dustin McNm）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。 通过他们的几个批准和有条件批准的实验，他们建议研究各种距离尺度下核子的夸克/胶子成分，测量质子的大小，并确定富中子核的结构。 该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作用力和弱作用力的性质的工作的延续。例如，强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如何随后结合成原子核。 该研究计划广泛地解决了强和弱力的许多方面，即：当海夸克和胶子的贡献最小时，价夸克如何自组装，胶子如何附着在夸克上以增加当前夸克的质量到组成夸克的质量的性质，夸克如何在核子内共振以形成夸克的激发组装，弱力如何在夸克的电子散射中耦合，以及通过宇称破坏证明的中子半径的精确数据。 所有这些专门的努力都需要一个小组，他们的工作重叠，协调当地的资源和技能，并保持坚实的团队合作意识。 此外，ISU小组正在为JLab研究社区提供优质服务，为杰斐逊实验室的12 GeV升级提供CLAS 12区域1漂移室的建造，布线和仪器。我们是密西西比以西最大的JLab集团。