STRUCTURE OF HALO NUCLEI BE-14 AND NE-32

The density-dependent relativistic mean-field theory, without introducing any adjustment, is applied to the nuclei Be-12, Be-14, Ne-30 and Ne-32. Contrary to the failure of the relativistic mean-field theory for the halo nuclei Be-14 and Ne-32, the density-dependent relativistic mean-field theory, in which the relativistic Brueckner-Hartree-Fock results of nuclear matter have been incorporated, can satisfactorily reproduce the experimental data of the binding energy and the abnormally large root-mean-square radius. It is also predicted that the halo neutrons in Be-14 occupy the 2s(1/2) level instead of the 1d(5/2) level and the halo neutrons in Ne-32 occupy the 2p(3/2) and 2p(1/2) levels instead of the 1f(7/2). A new picture on the appearance of the neutron halo has been obtained.