Abstract
Anharmonicities in nuclear quadrupole collective motions are studied by applying the self-consistent effective interactions derived in our previous work. Numerical calculations are made in terms of the boson expansion technique of Kishimoto-Tamura with several new refinements developed in the first paper of this series. It is shown that the three-body interaction is necessary to maintain the integrity of the collective modes in the presence of coupling with quasi-particle modes. General agreements with experimental data on nuclei in various mass region have confirmed that our theory is capable of describing various types of anharmonicities characteristic to the nuclei in question.
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