NEUTRON HALO AND SPIN-ORBIT-SPLITTING IN SOME NEUTRON-RICH NUCLEI

The density-dependent relativistic mean-field theory with sigma, omega , and rho mesons, as a parameter-free calculation, has been used to st udy the ground-state properties of Be-12,Be-14, Ne-30,Ne-32, Ca-60,Ca- 62, and Zr-122,Zr-124. A special emphasis is placed on the influence o f the rho tenser coupling on the neutron halo and on the spin-orbit sp litting. It is shown for the first time that the inclusion of the rho tenser coupling will lead to the isospin-dependent spin-orbit splittin g although the binding energy and the radius of these nuclei are insen sitive to it.