Ab initio theory of light and medium mass nuclei

轻质和中等质量核从头算理论

• 批准号: SAPIN-2016-00033
• 负责人: Navratil, Petr
• 金额: $ 5.83万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=660711
• 关键词: Ab; initio; theory; light; medium

Atomic nuclei are quantum many-body systems made by protons and neutrons interacting with forces that originate from the fundamental theory of Quantum Chromo-Dynamics. The exact treatment of nuclei starting from the constituent nucleons and the inter-nucleon interactions among them has been a long-standing goal in nuclear physics. ******The goal of this project is to develop a predictive ab initio theory of nuclear structure and nuclear reactions for light and medium mass nuclei. Such a theory is needed for understanding of exotic nuclei investigated at rare isotope facilities like ISAC at TRIUMF, for understanding of nuclear reactions important for astrophysics, for understanding of fusion reactions important for the future energy generation as well as for the testing of fundamental symmetries in nuclear processes. At the same time, it provides a feedback on the quality of inter-nucleon iteractions used as input to these calculations and ultimately helps to improve our knowledge of the nucleon-nucleon interaction, and in particular of the still-not-completely-understood three-nucleon interaction. ******In this proposal, we combine an ab initio nuclear structure approach capable to describe bound states of light nuclei with a microscopic cluster method developed to describe reactions of nuclear clusters. The resulting method provides a unified description of both bound and unbound nuclear states starting from inter-nucleon interactions among protons and neutrons. We will apply this method to improve our understanding of exotic nuclei such as 9He, 11N, or 17C, to describe halo nuclei like 11Be or 11Li. Using state-of-the-art nuclear forces including the three-nucleon interaction, we will calculate rates of nuclear reactions important for astrophysics including 7Be(p,gamma)8B, 3He(4He,gamma)7Be, 2H(alpha,gamma)6Li and 4He(nn,gamma)6He that are difficult or impossible to measure at low energies at which these reactions occur in cosmic environments. We will also investigate fusion reactions such as 3H(d,n)4He and the aneutronic 11B(p,alpha)8Be relevant for future energy generation. We will study beta decay of 6He that is being measured as an important test of physics beyond the Standard Model. We will also contribute to ab initio investigatinos of medium mass nuclei with one of the major goals to improve calculations of the neutrinoless double-beta decay matrix elements. Finally, a long-term goal of this project is the calculation of reactions important for stellar synthesis of 12C and 16O. It is anticipated that the complexity of theoretical understanding of these reactions equires exa-scale computing.**

原子核是由质子和中子与源自量子铬动力学基本理论相互作用的质子和中子与中子相互作用的量子多体系统。从组成核子开始的核的确切处理以及它们之间的核间相互作用一直是核物理学的长期目标。 ******该项目的目的是为轻质和中等质量核开发一种核结构和核反应的预测性理论。需要这种理论来理解在Triumf等稀有同位素设施等稀有同位素设施中研究的外来核，以了解对天体物理学重要的核反应，以了解对未来能量产生以及对核过程中基本符号的测试至关重要的融合反应。同时，它提供了用作这些计算输入的核之间迭代质量的反馈，并最终有助于提高我们对核子核子相互作用的了解，尤其是仍然没有完全理解的三核互动。 ******在此提案中，我们结合了一种从头开始的核结构方法，能够描述光核的结合状态与开发的微观聚类方法来描述核簇的反应。最终的方法提供了从质子和中子之间的核之间相互作用开始的结合和未结合核状态的统一描述。 我们将应用这种方法来提高对外来核（例如9HE，11N或17C）的理解，以描述诸如11BE或11LI之类的光环核。我们将使用包括三个核子相互作用在内的最先进的核力量，我们将计算对包括7BE（P，P，Gamma）8b，3he（4He，Gamma）7BE，2H（Alpha，Gamma）6Li和4He和4He（NN，Gamma）6HE的corment consmies corsm的corsmies corsmies corsmies corsmies corsmies corsmies corsmies corsmies corsmies corsmies corsmies的核反应速率。我们还将研究诸如3H（d，n）4He和Aneutronic 11b（p，alpha）8BE等融合反应与未来能源产生相关。我们将研究6HE的β衰减，该β衰减是在标准模型以外的物理学的重要测试中测量的。我们还将为中等质量核的Ab Insi算研究，其中一个主要目标之一是改善对中性的双β衰变矩阵元素的计算。最后，该项目的长期目标是计算对12C和16O的恒星合成重要的反应的计算。预计对这些反应的理论理解的复杂性等于Exa级计算。**