Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Thu., October 21, 2010, at 3:00 p.m. (refreshments at 2:40 p.m.)

Isovector channel in Skyrme and quark-meson-coupling models

Furong Xu, Beijng University, Beijing
Building 6008 Conference Room

There exist many sets of parameters for the Skyrme force. All the sets of the Skyrme parameters can reasonably describe the properties of finite nuclei. However, they give remarkably different behaviors of density dependence of the symmetry energy for the nuclear matter. The behavior of the symmetry energy is governed by the isovector channel of the energy density functional. The isovector channel should also play an important role in exotic nuclei which have extreme isospins. Within the Hartree-Fock approximation, we have studied the density functionals of the Skyrme and quark-meson-coupling (QMC) models. The similarity of the density functionals of the two models provides a further understanding of the nature of the Skyrme force and gives a method to determine the parameters of the Skyrme model from QMC. The Skyrme parameters determined from QMC give a soft density dependence of the symmetry energy and as well as the reasonable descriptions of finite nuclei. It is found that the Fock exchange increases the density dependence of the isovector channel, which is crucial to explain the soft symmetry energy.