A Program of measurement of high energy electron and gamma ray interactions with matter

高能电子和伽马射线与物质相互作用的测量程序

• 批准号: 0101448
• 负责人: Raymond Arnold
• 金额: $ 88万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-15 至 2004-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0101448&HistoricalAwards=false
• 关键词: Program; measurement; energy; electron; gamma

This award will support preparing, carrying out, and analyzing aseries of measurements of electromagnetic structure of matter by theUniversity of Massachusetts Group, primarily at the Stanford LinearAccelerator Center (SLAC) and for conducting a program of graduateand undergraduate education in experimental high energy nuclearphysics. This work has as a common thread the use of high energy(sometimes polarized) electrons and gamma rays to probe matter. Amajor area of work will be the data runs, analysis, and publicationsfor SLAC Experiment E158 that will use the SLAC high intensitypolarized electron beam and a new dedicated spectrometer anddetector system to measure parity violating asymmetry inelectron-electron scattering. This high precision data will provideimportant tests of the Standard Model of matter at low momentumtransfer in the electromagnetic coupling via the interferencebetween exchange of virtual photons and Z bosons. The UMass Grouphas contributed to the design of the spectrometer and beamlineinstrumentation, to the calibration systems, and to implementationof the data acquisition system. The UMass Group is taking a leadingrole in developing a new high intensity, high energyquasi-monoenergic polarized photon beam facility to be build at SLACfor a program of experiments: 1) to measure the high energycontribution to the Gerasimov-Drell-Hearn sum rule 2) to measure thenuclear dependence of the photoproduction of charmed mesons and 3)to measure the gluon spin distribution using polarizedphotoproduction of charmed mesons.

该奖项将支持马萨诸塞州大学集团主要在斯坦福大学线性加速器中心（SLAC）准备、实施和分析一系列物质电磁结构测量，并开展实验高能核物理学研究生和本科生教育计划。 这项工作有一个共同的线索，使用高能（有时极化）电子和伽马射线探测物质。一个主要的工作领域将是SLAC实验E158的数据运行、分析和出版物，该实验将使用SLAC高强度极化电子束和一个新的专用光谱仪和探测器系统来测量电子-电子散射中违反宇称的不对称性。 这些高精度的数据将为低动量物质标准模型通过虚光子交换与Z玻色子干涉的电磁耦合传递提供重要的检验。麻省大学的研究小组对分光计和光束线仪器的设计、校准系统以及数据采集系统的实施都做出了贡献。 麻省大学的研究小组正在牵头开发一个新的高强度、高能量准单能偏振光子束装置，该装置将在SLAC建造，用于一个实验计划：1）测量高能对Gerasimov-Drell-Hearn求和规则的贡献; 2）测量粲介子光生的核依赖性; 3）利用粲介子的偏振光生测量胶子自旋分布。