Nuclear Structure Studies with Fast Neutrons

快中子的核结构研究

• 批准号: 0354656
• 负责人: Steven Yates
• 金额: $ 72万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-06-01 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0354656&HistoricalAwards=false
• 关键词: Nuclear; Structure; Studies; Fast; Neutrons

The nuclear structure research program at the University of Kentucky is focussed on timely, related topics in nuclear spectroscopy, neutron-induced reactions, and neutron scattering. Experimental work is designed to take advantage of the neutron production capabilities at the University's accelerator facility and the unique detection systems that have been developed in this laboratory; however, complementary, collaborative research with colleagues at other institutions is also pursued. Nuclear structure studies are primarily oriented toward exploring multiphonon vibrational excitations in nearly spherical nuclei, examining magnetic and electric dipole transitions in collective excitations, defining the roles of protons and neutrons in collective modes, and understanding nuclear shell structure and the nature of nuclear shape transitions. The characterization of mixed-symmetry states, new types of collective modes, in weakly deformed nuclei and phonon-coupled excitations of these states is a high priority. Neutron scattering studies, which aid in elucidating the differences between neutron excitation and other probes, will complement studies of the microscopic basis of collective excitations. The study of isospin symmetry in medium-mass nuclei is a new research direction. Nuclear level lifetime measurements with the Doppler-shift attenuation method and gamma-gamma coincidence measurements, for which the methodologies have been developed in our laboratory, will play crucial roles in many of these studies. Carefully selected experiments in other areas which are particularly appropriate to the capabilities and facilities at the University of Kentucky accelerator laboratory will be pursued. The education of nuclear science students at the undergraduate, graduate, and post-graduate levels is emphasized, and efforts to provide a diverse working environment at the University of Kentucky are an ongoing, vital component of the program

肯塔基大学的核结构研究项目专注于核光谱、中子诱发反应和中子散射等及时相关的主题。 实验工作旨在利用大学加速器设施的中子生产能力以及该实验室开发的独特检测系统；然而，我们也与其他机构的同事进行互补的合作研究。 核结构研究主要面向探索近球形核中的多声子振动激发，检查集体激发中的磁和电偶极子跃迁，定义质子和中子在集体模式中的作用，以及了解核壳结构和核形状转变的性质。弱变形核中的混合对称态、新型集体模式以及这些态的声子耦合激发的表征是一个高度优先的任务。 中子散射研究有助于阐明中子激发和其他探针之间的差异，将补充集体激发的微观基础的研究。 中等质量原子核同位旋对称性的研究是一个新的研究方向。 我们实验室开发了采用多普勒频移衰减法和伽马-伽马符合测量的核能级寿命测量，这些方法将在许多此类研究中发挥至关重要的作用。将在特别适合肯塔基大学加速器实验室的能力和设施的其他领域进行精心挑选的实验。 强调对本科生、研究生和研究生级别的核科学学生的教育，肯塔基大学提供多元化工作环境的努力是该计划持续的重要组成部分