Nucleon Structure and Nuclear Force Studies at Intermediate Energies

中能核子结构和核力研究

• 批准号: 0072240
• 负责人: Bryon Anderson
• 金额: $ 60.3万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2001-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0072240&HistoricalAwards=false
• 关键词: Nucleon; Structure; Nuclear; Force; Studies

0072240Anderson This project is centered around the study of the structure of thenucleon, primarily by the measurement of the electric form factor of the neutron. This group will play a pivotal role in an approved experiment at the Thomas Jefferson National Accelerator Facility (JLab) designed to measure the electric form factor of the neutron as a function of momentum transfer. Because the neutron is overall neutral, the electric form factor is very sensitive to the details of the constituents and their motions. This measurement provides one of the best experimental tests available for any model of the nucleon and is generally considered to be one of the most important measurements to be performed in intermediate-energy nuclear physics. The experiment will be performed by the scattering of longitudinally polarized electrons from a liquid deuterium target and detecting the knock-out neutron in coincidence with the scattered electron. The Kent State group has the responsibility for providing the neutron detector array for this experiment. The array consists of thirty-six separate neutron detectors arranged so as to bothdetect the neutron and determine its spin. The transfer of the spin from the electron beam to the neutron is directly related to the charge form factor of the neutron. The detector array is called a neutronpolarimeter. The Kent State group has used a similar polarimeter inexperiments at other accelerator facilities and will have theresponsibility for the installation, operation, and maintenance of thisdetector array for the experiment. This project will be part of thePh.D. dissertation research of two Kent State graduate students. Support from this award will also enable this group to finish theanalysis of experiments performed at the Indiana University CyclotronFacility to study the spin dependence of the nuclear force, to searchfor three-body contributions to the nuclear force, and also to analyzemeasurements of baryon resonances using the Crystal Ball Spectrometer at the Brookhaven AGS accelerator. These measurements were performed with earlier support from the National Science Foundation and are part of the dissertation projects of three Kent State graduate students.

这个项目以研究核子的结构为中心，主要是通过测量中子的电子形状因数来实现的。这个小组将在托马斯·杰斐逊国家加速器设施(JLab)批准的一项实验中发挥关键作用，该实验旨在测量作为动量转移函数的中子的电子形状因数。由于中子总体上是中性的，电子形状因数对成分及其运动的细节非常敏感。这一测量为核子的任何模型提供了最好的实验测试之一，通常被认为是在中能核物理中进行的最重要的测量之一。这项实验将通过纵向极化的电子从液体氘靶上散射，并检测与散射电子一致的敲除中子来进行。肯特州立大学小组负责为这项实验提供中子探测器阵列。该阵列由36个独立的中子探测器组成，它们被布置成既能探测中子又能确定其自旋。自旋从电子束到中子的转移与中子的电荷形状因子直接相关。探测器阵列被称为中子偏振仪。肯特州立大学的研究小组已经在其他加速器设施的实验中使用了类似的偏振仪，并将负责安装、操作和维护该实验的探测器阵列。这个项目将是肯特州立大学两名研究生博士论文研究的一部分。该奖项的支持还将使该小组能够完成在印第安纳大学回旋加速器上进行的实验的分析，以研究核力的自旋相关性，搜索对核力的三体贡献，并使用布鲁克海文AGS加速器的水晶球光谱仪分析重子共振的测量。这些测量是在早期国家科学基金会的支持下进行的，是肯特州立大学三名研究生论文项目的一部分。