报告题目：QCD sum rule approach to nuclear structure problems
报告专家：Prof. Hiroyuki Sagawa, RIKEN/University of Aizu, Japan
报告时间：2024年5月10日（星期五）下午3:30-5:30
报告地点：物理A楼228会议室

专家简介：Hiroyuki Sagawa 教授是日本理化学研究所（RIKEN）仁科中心教授、会津大学(University of Aizu)数理学中心教授和主任、国际著名原子核物理学家。1975 年博士毕业于日本东北大学，先后在丹麦Niels Bohr研究所、美国密歇根州立大学、日本东京大学、阿姆斯特丹核能与高能研究所(NIKHEF)等地工作，同时也是法国巴黎南大学、瑞典Lund institute of technology和意大利Milano University的客座教授。在原子核物理领域核结构、核转动、巨共振、张量相关的HF计算、弱束缚核中对关联效应和双核子关联、QCD求和规则、电荷对称性破缺等方面很有建树，在PRL、PPNP等期刊上发表重要学术论文500多篇，并著有包括量子力学在内多本教科书，取得突出成绩，在国际上具有很强的影响力。

报告内容：Microscopic approach based on quantum chromodymanics (QCD) is the most challenging ab initio theory for nuclear structure physics.  In this respect, QCD sum rule gives a powerful tool, but numerically not highly demanding, to cross a bridge the QCD and hadron spectroscopy such as meson and baryon masses in terms of chiral symmetry breaking due to quark condensation. In nuclear medium, a partial restoration of the chiral symmetry breaking is found in the pionic atom experiments.
    In my talk, I will present the QCD sum rule approach to the anomaly in the mass difference of mirror nuclei, known as Okamoto-Nolen-Schiffer (ONS) anomaly, which is not yet solved by fully microscopic theory.  Our approach is intimately related with the partial restoration of the chiral symmetry  breaking in nuclear medium and provides a quantitative solution of the ONS anomaly in the mass difference between protons and neutrons in nuclear medium.  I will also mention the charge symmetry breaking effect in hyper nuclei which is observed recently.