Investigation of Nuclear Structure with Intermediate-Energy Photons
用中能光子研究核结构
基本信息
- 批准号:9803952
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing grant
- 财政年份:1998
- 资助国家:美国
- 起止时间:1998-07-01 至 2002-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
A study of the structure of nucleons and the role of quarks in determining this structure will be performed using the tagged photon system in Hall B at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). The photon tagger, which was in large part designed and built by the Catholic University of America (CUA) group, measures the energy of the photon that produces a reaction in a nuclear target. The reaction products are then measured by the CEBAF Large Acceptance Spectrometer (CLAS). The CUA group is an active participant in the CLAS Collaboration, a partnership of many user groups devoted to constructing, and using the instrumentation in Hall, B to perform a variety of experiments concurrently. During the initial phase of the CLAS program, the CUA group is most deeply involved in two experiments: the photoproduction of strange particles (K mesons and hyperons), and the helicity structure of pi meson photoproduction. The former experiment, designed to probe the role of strange quarks in the proton, will provide a data sample more than 100 times larger than that previously available. The latter, requiring both a polarized photon beam and a polarized proton target, will constitute part of a test of the Drell- Hearn-Gerasimov sum rule, a fundamental quantity of worldwide interest. The CUA group is also participating in two experiments which use the tagged photon beam without the CLAS: a measurement of the photofission probabilities for heavy nuclei, and a measurement of the rare decays of the phi meson.
将利用托马斯杰斐逊国家加速器设施(杰斐逊实验室)B厅的标记光子系统,对核子结构和夸克在确定这种结构中的作用进行研究。光子标记器,这是在很大程度上由美国天主教大学(CUA)集团设计和建造,测量光子的能量,产生核目标的反应。然后用CEBAF大型接收光谱仪(CLAS)测量反应产物。CUA组是CLAS协作的积极参与者,CLAS协作是许多用户组的合作伙伴关系,致力于构建和使用霍尔,B的仪器同时进行各种实验。在CLAS计划的初始阶段,CUA小组最深入地参与了两个实验:奇异粒子(K介子和超子)的光生,以及π介子光生的螺旋度结构。前一个实验旨在探测质子中奇怪夸克的作用,将提供比以前大100倍的数据样本。后者,需要一个偏振光子束和一个偏振质子目标,将构成一个测试的德雷尔-赫恩-格拉西莫夫总和规则,一个基本量的世界范围内的利益。CUA小组还参与了两个实验,这些实验使用了没有CLAS的标记光子束:测量重核的光裂变概率,以及测量phi介子的罕见衰变。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Daniel Sober其他文献
Daniel Sober的其他文献
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