The Introduction Of Relativistic Mean Field Theory And Its Application In Light Nuclei

In this thesis we mainly investigate the existence of neutron halo Li, Be, B, etc and proton halo in S, P, by a modified Relativistic Mean Field Theory (RMF) model.Neutron halo is one of the most important discovery in late century. Before this discovery, the scientists believed that:all nuclei have strongly binding structure, the radii of the nuclei are proportional to A1/3, and the proton's density distribution is similar to the neutron. The discovery of neutron halo broke this old rule, the experiments show that, some special nuclei have extraordinary large neutron RMS(Root Mean Square Radii), displaying a long tail in the density distribution curve.Relativistic mean field theory has been used in recent years by a number of authors and detailed reviews have been given by Serot and Walecka. This method has turned out to be a very successful tool for the description of many nuclear properties:Binding energies and nuclear charge radii are reproduced to within a few percent and the density distribution of doubly magic spherical nuclei are in excellent agreement with electron scattering data.In this thesis, we first review the RMF model that we studied. Considering the quark effects introduced by the Quantum Meson Coupling(QMC) model, we reconstruct the RMF model and investigate the basic properties of some nuclei, like 11Li, 90Zr, 40Ca,206Pb, in particular the properties of the light halo nuclei. The numerical results from the modified RMF model are consistent with experimental results, the correction of the quark effect on RMS radii, may reach 10%.