Nuclear Triaxial Shape Phase Transitions In The Interacting Boson Model

The Interacting Boson Model (IBM) is one of the most significant models in theory of nuclear structure. Investigation on properties of the model is of importance. In this thesis, the original Fortran codes are updated and optimized. Based on the new codes, nuclear triaxial shape phase transitions in the model including three-body interactions are studied. Some typical quantities, triaxial deformations, and other properties of the model are analyzed in detail. The model properties under variety of parameter situations are discussed. Finally, Os and Pt isotopes are taken as examples in illustrating the results.