Study Of High Spin States In Odd-Odd ¹³⁸Pm Nucleus

The intrinsic structure of the inside of nucleus has become an ineluctable question,as the developing exploration of the microcosmos.A common sense that the nucleus consists of protons and neutrons has been well known by people.However,how protons and neutrons combine with each other? Are the protons and neutrons in nucleus motionless or dynamic? What is the mode of their movement? So far,no one could carry out a definite answer to these questions.It seems a perfect nucleus model that could explain the thousands of strange phenomena in nuclei is urgent needed.The early nucleus model can describe the nuclei nearby the β stability line,however,it was bad conform with the nuclei with a big deformation.In 1960 s,a deeper research on the nuclei far away from the β stability line came true,as the high development of experiment technology.Especially,the development of accelerators and detectors,allows people studying the short-lifetime nuclei and the high excited states.All of these achievements,high spin was the high-light,and made a great contribution to the nuclear structure.High-spin state is a highly-excited state of the nucleus.The nuclei presents a lot new phenomena at this state.This paper reports the phenomena of ¹³⁸Pm in A¹30 region,and we also analyze the experimental result to provide an experimental basis for the nuclear model theory.High-Spin states of the odd-odd ¹³⁸Pm have been populated via fusion-evaporation reaction 124Te（19F,5n）¹³⁸Pm at the beam energy of 105 MeV.47 new γ transitions and 21 energy levels are observed.A new side band with the same πh_11/2（?）νh_11/2 configuration as that of the yrast band has been identified.On the basis of comparison with the previous proposed chiral doublet bands in 136 Pm,the observed two bands are suggested as candicate chiral doublet bands in ¹³⁸Pm.