Concluding Remarks

Abstract

I would like to begin my concluding talk with a discussion about relations among several models including the Interacting Boson Approximation (IBA). As Feshbach pointed out, we should distinguish the Interacting Boson Model (IBM) from the IBA, because the IBM is a model while the IBA is an approximation to the nuclear shell model. The latter was first introduced by Iachello and Feshbach. We further introduced two different Interacting Boson Models. One of them assumes one kind of bosons which has two orbits s and d, while the other does two kinds of bosons with distinguishingly proton and neutron. Let me call the first IBM 1 and the second IBM 2. Some times we call the IBM1 SU(6) model because s and d bosons altogether belong to the fundamental representation of SU(6) group.