Parity Violation in Hydrogen and Deuterium and Related Spin Physics Experiments

威廉和玛丽电弱自旋物理小组提议进行一项电磁和弱电研究计划，以探测强子和强子物质的风味成分。这项工作的主要重点将是在托马斯·杰斐逊国家加速器设施（杰斐逊实验室）使用极化电子束测量核子弹性电子散射中的宇称违反不对称性。实验将探索奇异夸克海对核子基态的贡献（Jab实验E91-010， Finn & &； Souder等人，以及E91-017， Beck等人）。奇异夸克海的强度对于核子模型和深度非弹性自旋结构函数结果的解释具有重要的意义。质子宇称实验（HAPPEX）和氧化石墨烯实验在实验室获得了最高的科学优先权。国家核科学委员会制定的核科学长期计划也认识到这项工作的重要性。该集团还打算开发并成为HAPPEX和GO项目可能扩展的一部分。对旋度相关光束波动的初步研究表明，杰斐逊实验室的光束质量优异，适合宇称违和测量。hapex的第一次生产计划于1998年进行。W&amp；M负责光学研究，蒙特卡罗模拟，以及本实验所需的探测器的设计，制造和安装。这些探测器正在组装和测试在我们的探测器实验室由研究生和本科生与小组有关。我们还与杰斐逊实验室、马里兰大学、卡内基梅隆大学、诺福克州立大学和GO合作组织签署了谅解备忘录，共同开发GO探测器包。GO光谱仪的调试预计将于2000年开始。这一努力有很大的教育成分。六名研究生（其中两名由杰斐逊实验室资助）目前正在杰斐逊实验室从事小组相关活动。我们还预计会有几名本科生参加毕业论文和夏季REU项目。

The William and Mary Electroweak Spin Physics Group proposes to undertake a program of electromagnetic and weak current studies that probe the flavor content of hadrons and hadronic matter. The primary focus of the effort will be measurements of the parity violating asymmetry in elastic electron scattering from the nucleon using a polarized electron beam at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). The experiments will explore the strange quark sea contributions to the nucleon ground state (Jab Experiments E91-010, Finn & Souder, et al., and E91-017, Beck, et al.). The strength of the strange-quark sea has important consequences for nucleon models and for interpretation of deep inelastic spin- structure function results. The HAPPEX (Hall A Proton Parity Experiment) and GO experiments have received the highest scientific priority at the laboratory. The importance of the proposed work is recognized as well in the long-range plan for nuclear science prepared by NSAC. The group also intends to develop and be a part of possible extensions to the HAPPEX and GO programs. Preliminary studies of helicity-dependent beam fluctuations indicate that the Jefferson Laboratory beam is of exceptional quality and suitable for parity violation measurements. The first HAPPEX production run for is scheduled for 1998. W&M are responsible for optic studies, Monte Carlo simulations, and for the design, fabrication, and installation of the detectors needed for this experiment. These detectors are being assembled and tested in our detector laboratory by graduate and undergraduate students associated with the group. We have also entered into a Memorandum of Understanding with Jefferson Laboratory, the University of Maryland, Carnegie Mellon University, Norfolk State University, and the GO Collaboration to work on the GO detector package. Commissioning of the GO spectrometer is expected to begin in 2000. There is a large educational component to this effort. Six graduate students (two supported by Jefferson Laboratory) are presently working on group related activities at Jefferson Laboratory. We also anticipate that several undergraduates will participate in senior thesis and summer REU projects.