Location: Cyclotron Building (434), Seminar Room
Dr. Wei-Zhou Jiang, Institute of Applied Physics Chinese Academy of Science Shanghai, China
Abstract:
The density dependence of the nuclear symmetry energy, which is essential for understanding the properties of nuclei far from the β stability, heavy ion collisions with radioactive beams, and the properties of neutron stars, is still poorly known. In this talk, I will first discuss in the relativistic mean-field approach the effect of the coupling between isoscalar and isovector mesons on the nuclear symmetry energy at high densities. I will then show that the nuclear symmetry energy can be constrained from consideration of the ρ-NN tensor coupling in light exotic nuclei and the enhanced isoscalar field in multi-Λ hypernuclei. The resulting relativistic mean-field model is used to study the properties of the hyperon matter and neutron stars. Further constraints on the symmetry energy can be obtained by taking into account the chiral symmetry at high densities. In particular, a relativistic mean-field model based on the Brown-Rho scaling is shown to reproduce very well the empirical properties of nuclear matter at 2-4.6 normal nuclear densities as well as those of the symmetry energy at low densities.