Research in Low-Energy Nuclear Theory

低能核理论研究

• 批准号: 1913069
• 负责人: Richard Furnstahl
• 金额: $ 48万
• 依托单位: Ohio State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1913069&HistoricalAwards=false
• 关键词: Research; Low; Energy; Nuclear; Theory

The strong interaction is responsible for the binding of protons and neutrons into atomic nuclei. Improved quantitative understanding of how this happens is essential not only for fundamental nuclear research at US experimental facilities but for progress in astrophysics, for experiments on the nature of neutrinos, and for applications to energy and homeland security. This project enables in part a new era of precision calculations of nuclear structure and reactions. Activities include extending the range and capabilities of statistical methods for assessing theoretical uncertainties and for physics discovery, developing and testing a novel systematic approach to heavier nuclei, and improving the extraction of information from experiment that minimally depends on model assumptions. The training received by undergraduates, graduate students, and postdoctoral research associates in carrying out these activities contributes directly to the building of a diverse scientific workforce. The mix of analytical and numerical computation the students and postdocs must employ is excellent preparation for both academic and industrial research, which is validated by the strong track record of past members of the group. Projects are in three major categories: Bayesian statistical methods for effective field theory (EFT) uncertainty quantification, EFT for finite density nuclear systems, and calculation/extraction of process-independent quantities. The Bayesian methods will be applied to inter-nucleon interactions, few- and many-body systems, and electroweak probes. They will address EFT truncation errors, parameter estimation, model selection, and model mixing. Recent studies of the density matrix expansion and phase-space contributions to many-body calculations will be the basis for further work on finite-density power counting and a renewed study of EFT for nuclear density functional theory. Finally, The PI and his collaborators will build on recent progress in understanding knock-out reactions from a renormalization group perspective, which highlights scale and scheme dependence in these interactions and raises questions about how to best analyze experiments that rely on factorization assumptions. Applications range from optical potentials to alternative treatments of short-range-correlation physics. These projects all contribute to the goal of microscopic, model-independent calculations of nuclei with quantified uncertainties. They will impact forefront problems in low-energy nuclear physics as outlined in the Long Range Plan, such as structure and reactions for the physics of nuclei far from stability, which is relevant for astrophysics and to the future Facility for Rare Isotope Beams (FRIB).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.

强相互作用导致质子和中子结合成原子核。 提高对这种现象如何发生的定量理解不仅对于美国实验设施的基础核研究至关重要，而且对于天体物理学的进展、中微子性质的实验以及能源和国土安全的应用至关重要。该项目在一定程度上开启了核结构和反应精确计算的新时代。 活动包括扩展用于评估理论不确定性和物理发现的统计方法的范围和能力，开发和测试一种针对较重原子核的新颖的系统方法，以及改进从实验中提取最小程度依赖于模型假设的信息。本科生、研究生和博士后研究员在开展这些活动时接受的培训直接有助于建立一支多元化的科学队伍。学生和博士后必须采用分析和数值计算的结合，为学术和工业研究做好良好的准备，该小组过去成员的良好记录证实了这一点。项目分为三大类：有效场理论 (EFT) 不确定性量化的贝叶斯统计方法、有限密度核系统的 EFT 以及过程无关量的计算/提取。贝叶斯方法将应用于核子间相互作用、少体和多体系统以及电弱探针。他们将解决 EFT 截断误差、参数估计、模型选择和模型混合问题。最近对密度矩阵展开和相空间对多体计算的贡献的研究将成为有限密度功率计数进一步工作和核密度泛函理论 EFT 重新研究的基础。最后，PI 和他的合作者将从重正化群的角度理解淘汰反应的最新进展为基础，这强调了这些相互作用中的规模和方案依赖性，并提出了如何最好地分析依赖因式分解假设的实验的问题。应用范围从光学势到短程相关物理的替代处理。这些项目都有助于实现具有量化不确定性的微观、独立于模型的核计算的目标。它们将影响长期计划中概述的低能核物理的前沿问题，例如远离稳定的原子核物理的结构和反应，这与天体物理学和未来的稀有同位素束（FRIB）设施相关。该奖项反映了 NSF 的法定使命，并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，被认为值得支持。

项目成果

Light nuclei with semilocal momentum-space regularized chiral interactions up to third order

• DOI: 10.1103/physrevc.103.054001
• 发表时间: 2020-12
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: P. Maris;E. Epelbaum;R. Furnstahl;J. Golak;K. Hebeler;T. Hüther;H. Kamada;H. Krebs;U. Meissner;J. Melendez;A. Nogga;P. Reinert;R. Roth;R. Skibi'nski;V. Soloviov;K. Topolnicki;J. Vary;Y. Volkotrub;H. Witała;T. Wolfgruber

Rigorous constraints on three-nucleon forces in chiral effective field theory from fast and accurate calculations of few-body observables

• DOI: 10.1103/physrevc.104.064001
• 发表时间: 2021-04
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: S. Wesolowski;I. Svensson;A. Ekström;C. Forssén;R. Furnstahl;J. Melendez;D. Phillips

Can a protophobic vector boson explain the ATOMKI anomaly?

• DOI: 10.1016/j.physletb.2021.136061
• 发表时间: 2020-08
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Xilin Zhang;G. Miller

Quantifying correlated truncation errors in effective field theory

量化有效场理论中的相关截断误差

• DOI: 10.1103/physrevc.100.044001
• 发表时间: 2019
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Melendez, J. A.;Furnstahl, R. J.;Phillips, D. R.;Pratola, M. T.;Wesolowski, S.
• 通讯作者: Wesolowski, S.

Quantifying uncertainties and correlations in the nuclear-matter equation of state

• DOI: 10.1103/physrevc.102.054315
• 发表时间: 2020-11-11
• 期刊: PHYSICAL REVIEW C
• 影响因子: 3.1
• 作者: Drischler, C.;Melendez, J. A.;Phillips, D. R.
• 通讯作者: Phillips, D. R.