Applications of Nuclear Structure Theory

核结构理论的应用

• 批准号: 1811855
• 负责人: B. Alex Brown
• 金额: $ 33万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-07-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1811855&HistoricalAwards=false
• 关键词: Applications; Nuclear; Structure; Theory

The properties of atomic nuclei are essential for our understanding of many areas of physics. At the most fundamental level, nuclei are composed of quarks held together by the exchange of gluons. The grouping of quarks into baryons and mesons provides the ingredients for our understanding of nuclei as being composed of protons and neutrons held together by the exchange of mesons. The stable isotopes provide about 250 different combinations of protons and neutrons. About 3,000 more combinations have been made in the laboratory, and many more, in particular those with a large excess of neutrons, will be made and studied at the next generation of facilities such as the Facility for Rare Isotope Beams (FRIB) at Michigan State University. Up to 7,000 different combinations of protons and neutrons were involved in the formation of the elements during the evolution of the universe. This project in nuclear structure theory will provide analytical models and computational tools for understanding the properties of these nuclei. The results of these studies will be applied to areas of fundamental physics and nuclear astrophysics where the nuclear properties are needed.This project will greatly expand the use of of Configuration Interaction (CI) and Energy Density Functional (EDF) models for nuclei. This will carried out on several levels. The PI will develop new Hamiltonians used for these methods with input from ab-initio models based on nucleon-nucleon scattering data together with empirical constraints from known experimental data. The PI will develop computational methods that allow for the solution of the quantum many-body problem that take into account the very large basis dimensions needed in the CI method. The PI will make applications of these results to many areas of physics interest. They will be used for collaborations with the experimental program at FRIB and other laboratories. They will be used to obtain nuclear matrix elements for studying fundamental physics with nuclei. They also will be used in collaboration with the Joint Institute for Nuclear Astrophysics and Center for the Evolution of the Elements (JINA-CEE) at MSU to calculate reaction rates needed for understanding supernovae and X-ray bursters, and for the nuclear equations of state needed for neutron stars and neutron star mergers. The graduate students supported by this project will have unique opportunities to train and contribute to high-profile research in nuclear theory.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.

原子核的性质对于我们理解物理学的许多领域是必不可少的。在最基本的水平上，原子核是由通过胶子交换而聚集在一起的夸克组成的。夸克分为重子和介子，这为我们理解原子核是由通过介子交换而聚集在一起的质子和中子提供了素材。稳定的同位素提供了大约250种不同的质子和中子组合。实验室里已经做出了大约3000种组合，还有更多的组合，特别是那些具有大量过剩中子的组合，将在下一代设施中进行制造和研究，比如密歇根州立大学的稀有同位素束设施(FRIB)。在宇宙演化期间，多达7000种不同的质子和中子组合参与了元素的形成。这个原子核结构理论项目将为理解这些原子核的性质提供分析模型和计算工具。这些研究的结果将应用于需要核性质的基础物理和核天体物理领域。该项目将极大地扩大组态相互作用(CI)和能量密度泛函(EDF)模型在原子核中的应用。这将在几个层面上进行。PI将开发用于这些方法的新哈密顿量，输入来自基于核子-核子散射数据的从头计算模型，以及来自已知实验数据的经验约束。PI将开发允许解决量子多体问题的计算方法，这些方法考虑到CI方法所需的非常大的基维度。PI将把这些结果应用到许多物理学感兴趣的领域。它们将用于与FRIB和其他实验室的实验计划合作。它们将被用来获得核矩阵元素，用于研究原子核的基础物理。它们还将与密歇根州立大学核天体物理联合研究所和元素演化中心(JINA-CEE)合作，计算理解超新星和X射线爆发所需的反应率，以及中子星和中子星合并所需的核状态方程。该项目资助的研究生将有独特的机会培训和贡献核理论方面的知名研究。这一奖项反映了NSF的法定使命，并通过使用基金会的学术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

Hybrid model for two-proton radioactivity

• DOI: 10.1103/physrevc.100.054332
• 发表时间: 2019-11
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: B. A. Brown;B. Blank;J. Giovinazzo

Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians

• DOI: 10.1016/j.physletb.2020.135678
• 发表时间: 2019-12
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: S. Heil;M. Petri;M. Petri;K. Vobig;D. Bazin;J. Belarge;P. Bender;P. Bender;B. Brown;Robert Elder;B. Elman;A. Gade;T. Haylett;J. Holt;T. Hüther;A. Hufnagel;H. Iwasaki;N. Kobayashi;C. Loelius;B. Longfellow;E. Lunderberg;M. Mathy;J. Menendez;S. Paschalis;R. Roth;A. Schwenk;A. Schwenk;J. Simonis;I. Syndikus;D. Weisshaar;K. Whitmore

Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments

利用同位旋对称性研究异构体在恒星环境中的作用

• DOI: 10.1103/physrevlett.126.042701
• 发表时间: 2021
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Hallam, S.;Lotay, G.;Gade, A.;Doherty, D. T.;Belarge, J.;Bender, P. C.;Brown, B. A.;Browne, J.;Catford, W. N.;Elman, B.
• 通讯作者: Elman, B.

In-beam γ-ray spectroscopy at the proton dripline: 40Sc

质子滴管处的束内 γ 射线光谱：40Sc

• DOI: 10.1016/j.physletb.2020.135637
• 发表时间: 2020
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Gade, A.;Weisshaar, D.;Brown, B.A.;Tostevin, J.A.;Bazin, D.;Brown, K.;Charity, R.J.;Farris, P.J.;Hill, A.M.;Li, J.
• 通讯作者: Li, J.

First-excited state g factors in the stable, even Ge and Se isotopes

稳定的 Ge 和 Se 同位素中的第一激发态 g 因子

• DOI: 10.1103/physrevc.100.044317
• 发表时间: 2019
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: McCormick, B. P.;Stuchbery, A. E.;Brown, B. A.;Georgiev, G.;Coombes, B. J.;Gray, T. J.;Gerathy, M. S.;Lane, G. J.;Kibédi, T.;Mitchell, A. J.
• 通讯作者: Mitchell, A. J.