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流研究计划，以探测强子和强子物质的味道含量。 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从核子弹性电子散射的宇称违反不对称性。 这些实验将探索奇异夸克海对核子基态的贡献（Jab Experiments E91-010，Finn Souder等人，和E91-017，Beck等人）。 奇异夸克海的强度对核子模型和解释深层非弹性自旋结构函数结果有重要影响。 HAPPEX（Hall A质子宇称实验）和GO实验在实验室获得了最高的科学优先级。 在NSAC制定的核科学长期计划中，也认识到了拟议工作的重要性。 该小组还打算开发并成为HAPPEX和GO计划可能扩展的一部分。 螺旋度相关的光束波动的初步研究表明，杰斐逊实验室的光束是特殊的质量和适合的宇称违反测量。 HAPPEX的第一次生产运行定于1998年。 W M负责光学研究，蒙特卡罗模拟，以及设计，制造和安装本实验所需的探测器。 这些探测器正在我们的探测器实验室组装和测试的研究生和本科生与该集团有关。 我们还与杰斐逊实验室、马里兰州大学、卡内基梅隆大学、诺福克州立大学和GO协作组织签订了谅解备忘录，共同研究GO探测器包。 GO光谱仪预计将于2000年开始投入使用。 这项工作有很大的教育成分。 六名研究生（两名由杰斐逊实验室支持）目前正在杰斐逊实验室从事与小组相关的活动。 我们还预计，一些本科生将参加高级论文和夏季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.