The chiral-quark-soliton model and the relativistic quark-cluster model are invoked to investigate the A-N interaction and the scattering phase shifts for the 3S1 and IS, channels. Inside the A-hyperon the flavour SU(3) symmetry-breaking is taken into account and is shown to be crucial for the n-meson exchange mechanism and the charge symmetry-breaking effect in the A-N interaction. The theoretical results are significant in comparison with the phenomenological approach.

No abstract

The isoscalar giant monopole and quadrupole states in finite nuclei are studied in a relativistic a -w model by making use of a local Lorentz boost and scaling method, and the nuclear surface and the density distribution are treated in the relativistic Thomas-Fermi approximation. The excitation energies of the giant resonances are self-consistently calculated. It is found that the excitation energies of giant monopole are-basically in agreement with experimental data for all nuclei and those of giant quadrupole for light nuclei. Coupling constants and (7-meson mass in the theory are chosen to fit static properties of nuclear matter. . Chao-yuan ZHU and Xi-jun QIU Vol. 15

No abstract

No abstract