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，以了解和预测生活在核稳定边缘的外来核的特性，并在诸如超新星等暴力天体物理事件中发挥重要作用。外来核的特征是其质子与中子比的不平衡，是短暂的，并通过表现出新的新兴现象来放大核力量鲜为人知的差异。当前，将量子染色体动力学连接到其性质的原子核的综合理论仍然缺失。在未来十年中，稀有同位素梁（FRIB）的设施将在未开发的核图表中未探索的中子富集的部分中首次生产，并提供新数据的痕迹，这将需要巨大的理论支持。该项目将解决理论与实验之间的当前断开连接，并通过关键的理论进步提高我们对原子核的理解。 该项目的更广泛影响涉及使用综合教育和研究活动对研究生和本科生的培训。 PI通过在佛罗里达州立大学组织的夏令营向当地高中学生推广也是该项目不可或缺的。具体而言，开放量子系统的密度基质重新归一化组方法将扩展到系统地测试光式外来核中的核力量，并改善较大系统的预测。利用中等相似性重新归一化方法的一种新的AB INTIO算方法将设计为扩展frib探索的异国中等质量核的预测能力；有效的现场理论框架将用于研究核壳模型图片中外来核中的多体共振和新兴现象。如果成功的话，这项研究将为外来核的物理学提供新的有价值的见解，并帮助指导FRIB及相关设施的实验。该奖项反映了NSF的法定任务，并且认为值得通过基金会的智力优点和更广泛的影响审查标准通过评估来获得支持。