Nuclear Structure Studies with Fast Neutrons

肯塔基大学的核结构研究项目主要关注核光谱学、中子诱导反应和中子散射等相关课题。实验工作旨在利用该大学加速器设施的中子生产能力和在该实验室开发的独特探测系统；然而，也与其他机构的同事进行补充性的合作研究。核结构研究的主要方向是探索近球形核中的多声子振动激励，研究集体激励中的磁偶极子和电偶极子跃迁，定义质子和中子在集体模式中的作用，理解核壳结构和核形状跃迁的本质。弱变形核中混合对称态、新型集体模式的表征以及这些态的声子耦合激发是一个高度优先考虑的问题。中子散射研究有助于阐明中子激发与其他探针之间的区别，将补充对集体激发的微观基础的研究。中等质量原子核的同位旋对称性研究是一个新的研究方向。用多普勒频移衰减法和伽玛-伽玛重合测量方法进行的核能级寿命测量将在许多这些研究中发挥关键作用，这些方法是我们实验室开发的。将在肯塔基大学加速器实验室的能力和设施特别适合的其他领域进行精心选择的实验。强调本科、研究生和研究生阶段的核科学学生的教育，并努力在肯塔基大学提供多样化的工作环境是该计划的一个持续的、重要的组成部分

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