Experimental Nuclear Physics with Electromagnetic Probes

该计划的主要部分侧重于使用电子和光子束研究重子，即质子和中子及其激发的性质。目标是阐明物质结构的夸克和胶子的分布，由量子色动力学（QCD）确定。该计划是基于托马斯杰斐逊国家加速器设施（JLab）。 RPI JLab计划有两个主要方面。 首先，使用JLab最先进的设施进行高可见性实验。 第二，为JLab 12 GeV能量升级准备物理计划，设计和建造实验设备。JLab计划在下一个提案期内的研究主要集中在进行最大可能动量转移的独家实验，其中电子束产生的所有粒子都被重建。其中包括：1）深虚康普顿散射（DVCS）和赝标介子电产生（DVMP），2）核子激发形状因子的测量。展望未来，该小组正在为JLab 12 GeV升级做准备。 零售物价指数的主要长期贡献将继续是 高阈值切伦科夫项目（HTCC）的设计，原型设计和测试。从物理学的角度来看，RPI小组成员是两个12 GeV提案的领导者。 第一，赝标介子在高动量转移下的深虚电生测量最近被JLab PAC接受为12 GeV物理计划的基本组成部分。另一个是测量高动量转移下的重子共振形状因子，该计划将在正在进行的JLab计划和12 GeV升级计划中发挥重要作用，该计划已被核物理界指定为核物理中最高优先项目之一。在更广泛的范围内，RPI将继续生产训练有素的物理科学博士。经验表明，这些人通常担任技术职业职位，这些职位对美国的技术领导地位非常重要。RPI小组通常涉及大量的本科研究参与者，作为他们在RPI技术教育的重要组成部分。我们将继续这样做。

The main part of the program focuses on the study of the properties of baryons, i.e. protons and neutrons, and their excitations, using electron and photon beams. The goal is to elucidate the structure of matter in terms of its quark and gluon distributions as determined by quantum chromodynamics (QCD). The program is based at the Thomas Jefferson National Accelerator Facility (JLab). The RPI JLab program has two major aspects. First, to conduct high visibility experiments using the state of the art facilities at JLab. Second, to prepare a physics program and to design and build experimental equipment for the JLab 12 GeV energy upgrade.The planned JLab research for the next proposal period focuses primarily on conducting exclusive experiments at the largest possible momentum transfers, in which all particles produced by the electron beam are reconstructed. These include: 1) the deep virtual Compton scattering (DVCS) and electroproduction of pseudoscalar mesons (DVMP), and 2) the measurement of nucleon excited form factors. Looking toward the future, the group is engaged in preparations for the JLab 12 GeV upgrade. The main long term RPI contribution will continue to be the design, prototyping, and testing of the Hi threshold Cherenkov project (HTCC). From the physics point of view, the RPI group members are leaders of two 12 GeV proposals. One, the measurement of deeply virtual electroproduction of pseudoscalar meson at high momentum transfer has recently been accepted by the JLab PAC as a fundamental component of the 12 GeV physics program. The other, involves the measurement of baryon resonance form factors at high momentum transfer.The program will play a major part in the ongoing JLab program and in the 12 GeVupgrade, which has been specified by the nuclear physics community as one of the highest priority items in nuclear physics. On a broader scale, RPI will continue to produce highly trained PhDs in the physical sciences. Experience shows that these persons typically take on technical career positions in which are important to the US position in technical leadership. The RPI group, typically involves a significant number of undergraduate research participants as a vital part of their technical education at RPI. We will continue to do this.