CAREER: Large-Scale Theoretical Capabilities for Exploring the Limits of Nuclear Stability

职业：探索核稳定性极限的大规模理论能力

• 批准号: 2238752
• 负责人: Kevin Fossez
• 金额: $ 45万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2028-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2238752&HistoricalAwards=false
• 关键词: CAREER; Large; Scale; Theoretical; Capabilities

This project will develop new theoretical capabilities to understand and predict the properties of exotic nuclei living at the edges of nuclear stability and playing an important role in violent astrophysical events such as supernovae. Exotic nuclei, characterized by large imbalances in their proton-to-neutron ratios, are short-lived and magnify less known aspects of nuclear forces by exhibiting new emergent phenomena. Currently, a comprehensive theory of the atomic nucleus connecting quantum chromodynamics to their properties is still missing. In the coming decade, the Facility for Rare Isotope Beams (FRIB) will produce for the first time thousands of new isotopes in the unexplored neutron-rich part of the nuclear chart and provide a trove of new data, which will require enormous theoretical support. This project will address the current disconnect between theory and experiment and advance our understanding of atomic nuclei through key theoretical advances. The broader impacts of this project concern the training of graduate and undergraduate students using integrated education and research activities. Outreach by the PI to local high school students through a summer camp organized at Florida State University is also integral to the project. Specifically, the density matrix renormalization group method for open quantum systems will be extended to systematically test nuclear forces in light exotic nuclei and improve predictions in larger systems; a new ab initio method exploiting the in-medium similarity renormalization group method will be devised to extend the predictive power of ab initio methods in exotic medium-mass nuclei explored by the FRIB; and the effective field theory framework will be used to study many- body resonances and emergent phenomena in exotic nuclei from the nuclear shell model picture. If successful, this research will provide new and valuable insight into the physics of exotic nuclei, and help guide experiments at the FRIB and related facilities.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目将发展新的理论能力，以理解和预测生活在核稳定边缘的奇异核的性质，并在超新星等剧烈天体物理事件中发挥重要作用。奇异核的特征是质子与中子比率的巨大不平衡，它们的寿命很短，并通过展示新的涌现现象来放大不太为人所知的核力。目前，一个全面的理论，原子核连接量子色动力学，他们的性质仍然是缺失的。在未来十年中，稀有同位素束设施（FRIB）将首次在核图表中未探索的富中子部分产生数千种新同位素，并提供大量新数据，这将需要大量的理论支持。该项目将解决目前理论与实验之间的脱节，并通过关键的理论进展来推进我们对原子核的理解。 该项目的更广泛影响涉及利用综合教育和研究活动培训研究生和本科生。PI通过在佛罗里达州立大学组织的夏令营向当地高中生进行外展也是该项目不可或缺的一部分。具体而言，将扩展开放量子系统的密度矩阵重整化群方法，以系统地测试轻奇异核中的核力，并改进对较大系统的预测;将设计一种利用介质内相似重整化群方法的新的从头算方法，以扩展FRIB探索的奇异中等质量核中从头算方法的预测能力;而有效场论框架将用于从核壳模型图研究奇异核中的多体共振和涌现现象。如果成功，这项研究将提供新的和有价值的洞察奇异核的物理，并帮助指导在FRIB和相关设施的实验。这个奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。