Structure of unstable nuclei

Abstract

The structure of unstable nuclei is discussed in terms of large-scale shell model calculations. First, the development and limitations of the conventional shell model calculations are mentioned. In order to overcome the limitations, the Quantum Monte Carlo Diagonalization (QMCD) method has been proposed. The basic formulation and features of the QMCD method are presented as well as its application to the nuclear shell model, as referred to as Monte Carlo Shell Model (MCSM). The MCSM provides us with a breakthrough in the shell model calculation: the structure of low-lying states can be studied with realistic interactions for a wide, nearly unlimited basically, variety of nuclei. Thus, the MCSM will contribute significantly to the physics to be developed by means of Radioactive Ion Beams. Applications to 56Ni, Ba isotopes and N ∼20 unstable nuclei far from the β stability line are mentioned. The mixing of normal, intruder and higher intruder states will be presented for N = 20 isotones, and 29F nucleus is shown to be bound due to such mixing.