Elementary Excitation Modes Built on Superdeformed High-Spin States

点击翻译按钮获取中文摘要

We have constructed a computer program that can find all solutions of the RPA equations for elementary excitation modes built on superdeformed high-spin states. Using this computer program, we have systematically investigated properties of multipole vibrations, both isoscalar and isovector types, which could be created on superdeformed rotation bands.The most important conclusion of this research is the theoretical prediction that the superdeformed nuclei with axis ratio 2 : 1 could be quite soft against the octupole deformations with the symmetry Y30, Y31 and Y32. Thus, existence of new types of soft vibrational modes having such symmetries are suggested, and the possibility of observing electric dipole transitions associated with them by means of the next generation of gamma-ray detector system has been discussed. The microscopic structure of these new modes and their change in character associated with the increase of the angular momentum of the rotational motion have been investigated in detail.