In my talk, I will present ab initio approach to derive charge symmetry breaking interaction based on quantum chromodynamics (QCD).  This Interaction is applied to cure the anomaly in the mass difference of mirror nuclei, known as Okamoto-Nolen-Schiffer (ONS) anomaly, which is an old problem but 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 as the mass difference between protons and neutrons in nuclear medium.  

Microscopic approach based on 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 spontaneous 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. I will discuss some details of QCD sum rule approach and CSB interaction of nucleon-nucleon (NN) interaction sector.

I will also mention the charge symmetry breaking effect in hyper nuclei which is observed recently.

报告人简介

Prof. Hiroyuki Sagawa is a theoretical physicist specializing in collective motion in nuclei, spin-isospin excitations, exotic nuclei, charge symmetry breaking in nuclei and hypernuclei. He obtained his Ph.D.in Physics from Tohoku University in 1975, focusing on nuclear theory. He has worked at the University of Tokyo, Utsunomiya University, Niels Bohr Institute, Universié de Paris-Sud, National Institute of Nuclear and High Energy Institute (NIKHEF) at Amsterdam, Michigan State University, and the University of Aizu. Now, he is a Senior Visiting Scientist at RIKEN Nishina Center and a Professor Emeritus at the University of Aizu.

邀请人

周善贵 研究员