【讲座题目】Ab initio Study of Light Nuclei
【主 讲 人】申时行
【讲座时间】2026年9月 29日 10：00-11：00
【讲座地点】主C636
【报告人简介】
申时行，北京航空航天大学副教授。2011 年于中山大学获学士学位，2017 年于北京大学获博士学位，先后在香港大学、意大利米兰大学、德国于利希研究中心从事博士后研究工作。长期致力于原子核第一性原理计算研究，在 Nature Communications、Physical Review Letters、Progress in Particle and Nuclear Physics、Nature 等国际顶级学术期刊上发表论文 27 篇。
【讲座内容简介】
Understanding nuclear structure from fundamental interactions and equations, i.e., ab initio, is a central goal of nuclear theory. In this work, we employ ab initio Nuclear Lattice Effective Field Theory to investigate light nuclear systems ranging from the tetraneutron system to nuclei exhibiting one-, two-, and three-alpha cluster structures. For the tetraneutron system, finite-volume spectra and dineutron-dineutron scattering phase shifts indicate a weak low-energy attraction but no evidence for a genuine four-neutron resonance. For alpha-cluster nuclei, the calculated low-lying spectra, radii, and electromagnetic properties are in good agreement with experimental data. Based on millions of correlated many-body wave functions, we extract intrinsic density distributions that reveal prominent two-center cluster structures, the emergence of a one-neutron halo, and rich nuclear molecular dynamics in the Beryllium isotopes, as well as an equilateral-triangular ground-state configuration and a bent-arm Hoyle-state configuration in Carbon-12. These results demonstrate the capability of Nuclear Lattice Effective Field Theory to provide a unified ab initio description of few-neutron dynamics, alpha clustering, halo structures, and nuclear molecular phenomena.
