Reflection asymmetric shell model and its description of the octupole deformed bands in Ra isotopes

The framework of the Reflection Asymmetric Shell Model(RASM) used to describe the high-spin states of octupole-deformed nuclei has been formulated by the variational procedure. Some basic features of the Yrast octupole bands can been explained by this model. We calculated the even-even(222-228)Ra isotopes, the agreement between the theory and the experimental data is good.