Microscopic description of Gamow-Teller resonance and collective isobaric 1+ states of spherical nuclei

A theory of collective isobaric 1+ states of spherical nuclei is constructed on the basis of the theory of finite Fermi systems. Particular attention is devoted to the description of a new type of giant isobaric resonance. This is the Gamow-Teller resonance, whose existence has recently been confirmed in charge-exchange reactions in experiments made at the Universities of Michigan and Indiana. The possibility of describing the Gamow-Teller resonance and the ground states of nuclei in a Wigner symmetry scheme based on the group SU(4) is analyzed. It is shown that such a description improves with increasing N--Z in the region of heavy nuclei. The experimental investigations on the Gamow-Teller resonance and collective isobaric 1+ states are reviewed. A method for calculating the properties of nuclei far from the β-stability line is developed on the basis of a theory of isobaric states, the use of which is illustrated by a number of examples