Properties of unstable nuclei within the relativistic many body theory

The relativity is the key ingredient of the success in the description of nuclei and nuclear matter at various conditions and hence also unstable nuclei. The relativistic-Brueckner Hartree-Fock (RBHF) theory provides as a first time the saturation property of nuclear matter. The relativity automatically induces a three body interaction in the non-relativistic language, which produces strongly density dependent repulsion. This implicit three body force effect would be one of the most important relativistic effects in addition to the well known spin-orbit force. In this respect, it is interesting to note also the result of the recent study of Weinberg with the chiral invariant effective theory, which predicts that the genuine three body force is weak. The description of the relativistic mean field theory on unstable nuclei is discussed and the agreement with the existing data is very satisfactory. A necessity to improve the parameter set is seen when compared with the results of the RBHF theory of nuclear matter. 14 refs., 7 figs