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.

该项目将开发新的理论能力，以了解和预测处于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。以质子与中子之比的极大不平衡为特征的奇异核是短暂的，并通过呈现新的新兴现象放大了不太为人所知的核力方面。目前，关于原子核将量子色动力学与其性质联系起来的全面理论仍然缺乏。在接下来的十年里，稀有同位素束设施(FRIB)将首次在核图中未探索的丰中子部分产生数千个新的同位素，并提供大量新数据，这将需要巨大的理论支持。这个项目将解决目前理论和实验之间的脱节，并通过关键的理论进展来促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对研究生和本科生进行培训。国际和平协会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宣传也是该项目不可或缺的一部分。具体来说，开放量子系统的密度矩阵重整化群方法将被扩展到系统地测试轻奇异核中的核力，并改进更大系统中的预测；将设计一种新的从头计算方法，利用介质中相似重整化群方法来扩展从头计算方法在奇异中等质量核中的预测能力；有效场论框架将被用于从核壳模型图中研究奇异核中的多体共振和涌现现象。如果成功，这项研究将为奇异核的物理学提供新的有价值的见解，并有助于指导FRIB和相关设施的实验。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。