RUI: Theoretical Nuclear Structure Studies at the University of Richmond

该项目针对当前感兴趣的核结构主题，尚未在理论和实验上得到充分探索：结构演化、动力学对称性、相变和临界点，以及奇和双奇Fr核的结构，以及手征旋转和振动。动力学对称性、相变和临界点不仅在核物理和其他物理领域，而且在化学和生物学中都扮演着关键角色。我们将寻找显示或接近显示E（5）和E（5/4）对称性特征的核，绘制对称三角形中宽范围中子数的Ba同位素链的轨迹。为了补充现有的数据并提供理论描述的视角，以及评估对称性破缺的程度和可能对其负责的扰动，我们将进行相互作用玻色子近似，壳模型，曲柄壳模型和粒子-振动耦合模型计算。因此，我们将（1）更好地理解动力学对称性和临界点跃迁，（2）重核的新知识，（3）更好地理解质量100，130和160区域的手征性。这项工作是里士满大学和耶鲁大学赖特核结构实验室的理论和实验小组之间现有合作的延续，将加强和整合理论核物理领域的研究和教育，同时促进里士满大学本科生的培训和专业发展。该项目对物理系的长期活力和基础设施至关重要。目前的学生参与研究提供了（至少部分）种子招聘在过去几年中更多的专业和未成年人在几个科学，数学，工程和技术学科。我们还预计，进入国家研究生课程的本科生人数将有所增加。

This project targets nuclear structure topics of current interest, not fully explored theoretically and experimentally: structural evolution, dynamical symmetries, phase transition and critical points, as well as the structure of odd and doubly odd Fr nuclei, and chiral rotations and vibrations. Dynamical symmetries, phase transition and critical points are key role-players not only in nuclear and other physics fields but also in chemistry and biology. We will search for nuclei that display or are close to displaying the characteristics of the E(5) and E(5/4) symmetries, map the trajectory of the Ba isotopic chain over a wide range of neutron numbers in the symmetry triangle. To complement the existing data and provide a perspective for the theoretical description, as well as to assess the degree of symmetry breaking and the perturbations that may be responsible for it, we will perform Interacting Boson Approximation, Shell Model, Cranking Shell Model and Particle-Vibrator Coupling Model calculations. As a result, we will have (1) a better understanding of dynamical symmetries and critical point transitions, (2) new knowledge on heavy nuclei, and (3) a better understanding of chirality in the mass 100, 130, and 160 regions. The work - a continuation of existing collaborations between theoretical and experimental groups at the University of Richmond and the Wright Nuclear Structure Laboratory at Yale University - will enhance and integrate research and education in the theoretical nuclear physics areas while promoting training and professional development of undergraduate students at the University of Richmond, a primarily undergraduate institution. This project is important to the long-term vitality and infrastructure of the physics department. Current students' involvement in research provided (at least in part) the seed for the recruitment in the past few years of more majors and minors in several Science, Mathematics, Engineering and Technology disciplines. We also expect an increase in the number of undergraduate students fed into national graduate programs.