報告人簡介
Hiroyuki Sagawa教授是日本理化學研究所仁科中心和會津大學數理學中心教授與主任、國際知名的原子核物理學家。1975年畢業于日本東北大學后，先后在世界各地的頂尖研究機構如丹麥的Niels Bohr研究所、美國密歇根州大學、日本東京大學以及荷蘭阿姆斯特丹核能與高能研究所等地進行研究工作。同時，還擔任法國巴黎南大學、瑞典Lund institute of technology和意大利Milano University的客座教授。在原子核物理領域，Sagawa教授在核結構、核轉動、巨共振、張量相關的HF計算、弱束縛核中對關聯效應和雙核子關聯、QCD求和規則、電荷對稱性破缺等方面取得了突出成就。他在頂尖學術期刊如PRL、PPNP等發表了500多篇重要學術論文，并撰寫了多本包括量子力學在內的教科書。他的研究成果在國際上產生了深遠影響，為原子核物理領域做出了重要貢獻。
內容簡介
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.
