Nuclear magnetic dipole properties and the triaxial deformation

Nuclear magnetic dipole properties of ground bands and γ-vibrational bands are studied for the first time using the triaxial projected shell model approach. The study is carried out for the Dy and Er isotopic chains, ranging from transitional to well-deformed region. It is found that the g-factor ratio of the 2+ state in ground bands to that of γ-bands, r=g(2+,γ-vib)/g(2+,ground), varies along an isotopic chain. With the γ-deformations, which best reproduce the energy levels for both bands, we obtain a qualitative agreement with the experimental data. This result thus suggests that study of the ratio may provide an important information on the triaxial deformation of a nuclear system. The angular-momentum dependence of the ground band g-factor on the triaxial deformation is also investigated.