RII Track-4: Ab initio modeling of nuclear reactions for studies of nucleosynthesis and fundamental symmetries in nature

RII Track-4：核反应从头开始建模，用于研究核合成和自然界的基本对称性

基本信息

批准号：
1738287
负责人：
Kristina Launey
金额：
$ 27.21万
依托单位：
Louisiana State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-15 至 2020-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1738287&HistoricalAwards=false
关键词：
RII Track Ab initio modeling

项目摘要

Non-technical DescriptionEver since the history-making discovery of nuclear fission, which demonstrated the huge amount of energy that can be released when the strong bonds between the atomic constituents (neutrons and protons) are broken, theoretical nuclear physicists have searched for a comprehensive explanation of the properties of the atomic nucleus based on knowledge of the strong force between these constituents. This project takes advantage of the instrumentation, computing capabilities, and theoretical expertise at the Lawrence Livermore National Laboratory (LLNL) to develop a theoretical framework that will improve our understanding of these forces. When this goal is achieved, it will be possible to predict reactions that take place under extreme conditions, from stellar explosions to the interior of nuclear reactors. Improving our knowledge of nuclear reactions will help us further understand 'nuclei-fueled' astrophysical processes, and safely and economically harness nuclear phenomena in support of the broad scope of humanitarian needs. Future advances in nuclear science and technology hold promise for a growing number of applications for medicine, industry, energy, and national security. The development of advanced instrumentation and applications of nuclear isotopes in disease treatments provide two prominent examples that rely on elementary properties of atomic nuclei. In addition to providing access to the facilities and expertise at LLNL, this project will provide training and unique research experiences for the PI and a postdoctoral fellow, with indirect benefits to graduate and undergraduate students. Technical DescriptionThis project aims to dramatically expand the reach as well as the impact of nuclear reaction theory with the aim of predicting properties of experimentally inaccessible nuclei and reactions, while supporting and informing experiments at current and upcoming radioactive beam facilities. The goal is to develop and implement a symmetry-guided theory that will enable pioneering ab initio investigations of reactions for heavier nuclear species, while accounting for the challenging structure of the participating nuclei. This will be achieved by capitalizing on approximate symmetries known to dominate in nuclei. In this approach all participating particles in the target and incoming proton or neutron are treated on the same footing within a 'shell model' concept of the quantum many-particle system and the compound nucleus. In addition, state-of-the-art chiral effective field theory interactions between protons and neutrons will be employed. New predictions, possible through the unique combination of expertise of theoretical and experimental nuclear physicists at Louisiana State University and LLNL are anticipated for processes inaccessible to experiments, which can facilitate neutrino- and fusion-related research and are key to advancing knowledge about astrophysical processes, as well as of fundamental symmetries in nature. This, in turn, can help address two of the most fundamental questions of physics today: the origin of elements, and if the neutrino is its own antiparticle. While the proposed applications focus on specific important questions, the new developments will have wider impact, as multi-physics simulations in the areas of nuclear energy and national security have similar needs. As part of this research, future leaders will be trained in research in low-energy nuclear science, while learning and working in massively parallel environments at petascale computing facilities.

非技术描述自核裂变的历史发现以来，核裂变证明了原子成分（中子和质子）之间的强键被破坏时可以释放出巨大的能量，理论核物理学家一直在寻找全面的解释基于对这些成分之间的强力的了解，了解原子核的性质。该项目利用劳伦斯利弗莫尔国家实验室 (LLNL) 的仪器、计算能力和理论专业知识来开发一个理论框架，以提高我们对这些力的理解。当这个目标实现时，就有可能预测极端条件下发生的反应，从恒星爆炸到核反应堆内部。提高我们对核反应的了解将有助于我们进一步了解“核燃料”天体物理过程，并安全、经济地利用核现象来支持广泛的人道主义需求。核科学技术的未来进步有望在医学、工业、能源和国家安全领域得到越来越多的应用。先进仪器的发展和核同位素在疾病治疗中的应用提供了两个依赖原子核基本特性的突出例子。除了提供使用 LLNL 的设施和专业知识之外，该项目还将为 PI 和博士后研究员提供培训和独特的研究经验，从而为研究生和本科生带来间接好处。技术描述该项目旨在显着扩大核反应理论的范围和影响，旨在预测实验上无法接近的核和反应的特性，同时支持和告知当前和即将推出的放射性束设施的实验。目标是开发和实施一种对称引导理论，该理论将能够对较重核素的反应进行开创性的从头开始研究，同时解释参与核的具有挑战性的结构。这将通过利用已知在原子核中占主导地位的近似对称性来实现。在这种方法中，目标中的所有参与粒子和传入的质子或中子在量子多粒子系统和复合核的“壳模型”概念中被同等对待。此外，还将采用最先进的质子和中子之间的手性有效场论相互作用。通过路易斯安那州立大学和路易斯安那国家实验室的理论和实验核物理学家的专业知识的独特结合，可以对实验无法达到的过程进行新的预测，这可以促进中微子和聚变相关的研究，并且是推进有关天体物理过程的知识的关键，以及自然界的基本对称性。这反过来又可以帮助解决当今物理学中两个最基本的问题：元素的起源，以及中微子是否是它自己的反粒子。虽然拟议的应用侧重于具体的重要问题，但新的发展将产生更广泛的影响，因为核能和国家安全领域的多物理模拟也有类似的需求。作为这项研究的一部分，未来的领导者将接受低能核科学研究的培训，同时在千万级计算设施的大规模并行环境中学习和工作。

项目成果

期刊论文数量（25）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Benchmark calculations of electromagnetic sum rules with a symmetry-adapted basis and hyperspherical harmonics

DOI：
10.1103/physrevc.102.014320
发表时间：
2020-03
期刊：
arXiv: Nuclear Theory
影响因子：
0
作者：
R. Baker;K. Launey;S. Bacca;N. Dinur;T. Dytrych
通讯作者：
R. Baker;K. Launey;S. Bacca;N. Dinur;T. Dytrych

No-core Symplectic Model: Exploiting Hidden Symmetry in Atomic Nuclei

DOI：
10.1088/1742-6596/863/1/012008
发表时间：
2017-06
期刊：
Journal of Physics: Conference Series
影响因子：
0
作者：
J. Draayer;K. Launey;T. Dytrych;A. Dreyfuss;R. Baker;M. Miora
通讯作者：
J. Draayer;K. Launey;T. Dytrych;A. Dreyfuss;R. Baker;M. Miora

Ab initio folding potentials for nucleon-nucleus scattering based on no-core shell-model one-body densities

基于无核壳模型单体密度的核子-核散射的从头计算折叠势

DOI：
10.1103/physrevc.99.044603
发表时间：
2019
期刊：
Physical Review C
影响因子：
3.1
作者：
Burrows, M.;Elster, Ch.;Weppner, S. P.;Launey, K. D.;Maris, P.;Nogga, A.;Popa, G.
通讯作者：
Popa, G.

Efficient algorithm for representations of U(3) in U(N)

U(3) 在 U(N) 中表示的高效算法

DOI：
10.1016/j.cpc.2019.05.018
发表时间：
2019
期刊：
Computer Physics Communications
影响因子：
6.3
作者：
Langr, Daniel;Dytrych, Tomáš;Draayer, Jerry P.;Launey, Kristina D.;Tvrdík, Pavel
通讯作者：
Tvrdík, Pavel

SU3lib: A C++ library for accurate computation of Wigner and Racah coefficients of SU(3)

SU3lib：用于精确计算 SU(3) 的 Wigner 和 Racah 系数的 C 库

DOI：
10.1016/j.cpc.2021.108137
发表时间：
2021
期刊：
Computer Physics Communications
影响因子：
6.3
作者：
Dytrych, Tomáš;Langr, Daniel;Draayer, Jerry P.;Launey, Kristina D.;Gazda, Daniel
通讯作者：
Gazda, Daniel