Investigating the Electromagnetic Structure of the Nucleon and Light Nuclei at Jefferson Lab

在杰斐逊实验室研究核子和轻核的电磁结构

• 批准号: SAPIN-2015-00040
• 负责人: Sarty, Adam
• 金额: $ 3.75万
• 依托单位: Saint Mary's University
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=617818
• 关键词: Investigating; Electromagnetic; Structure; Nucleon; Light

The primary objective of this research project is to continue collaborative efforts at the Thomas Jefferson National Accelerator Facility ("Jefferson Lab") in Newport News, Virginia, which are specifically aimed at probing the structure of the nucleon using a high energy electron beam. This work will be accomplished in collaboration with the Super BigBite Spectrometer (SBS) Collaboration in Hall A at Jefferson Lab. During this grant period, Jefferson Lab will be emerging from the past transition "upgrade period" phase - having upgraded the beam energy from 6 GeV to 12 GeV - and beginning to utilize equipment specifically designed and built for the higher energy. This proposal includes a plan to ensure continued scientific contributions and student training with the early-running Hall A experiments (experiments focusing not only on nucleon structure, but also on that of light nuclei - particularly the triton three-nucleon system), but with primary emphasis remaining on preparation/development projects associated with a series of specific later-running SBS experiments that will probe nucleon structure functions at very high momentum transfers. The driving physics goals of all aspects of this project are related to improving understanding of the transition from the 'strong (non-perturbative) QCD' regime of relatively large distance scales of approximately 1 to a few fermis (where hadronic degrees of freedom are most appropriate), to the 'perturbative QCD' regime of much shorter distance scales.

该研究项目的主要目标是继续在弗吉尼亚州纽波特纽斯的托马斯·杰斐逊国家加速器设施（“杰斐逊实验室”）进行合作，该设施专门致力于使用高能电子束探测核子的结构。这项工作将与位于杰斐逊实验室 A 厅的 Super BigBite 光谱仪 (SBS) 合作完成。在此资助期间，杰斐逊实验室将摆脱过去的过渡“升级期”阶段 - 将束流能量从 6 GeV 升级到 12 GeV - 并开始使用专门为更高能量设计和制造的设备。该提案包括一项计划，以确保通过早期运行的 A 厅实验（实验不仅关注核子结构，还关注轻核结构 - 特别是 Triton 三核子系统）继续做出科学贡献和学生培训，但主要包括重点仍然放在与一系列特定的后续运行的 SBS 实验相关的准备/开发项目上，这些实验将在非常高的动量转移下探测核子结构功能。该项目各个方面的驱动物理目标与提高对从大约 1 的相对较大距离尺度到几个费米（其中强子自由度最大）的“强（非微扰）QCD”体系的转变的理解有关。适当），到更短距离尺度的“微扰QCD”状态。