Study on the high-spin states and signature inversion of odd-odd nucleus ¹⁷⁰Ta

The high-spin states of odd-odd nucleus ¹⁷⁰Ta were populated via the ¹⁵⁵Gd(¹⁹F, 4n) ¹⁷⁰Ta reaction with beam energy of 97 MeV provided by the HI-13 tandem accelerator of China Institute of Atomic Energy. Three rotational bands have been pushed to higher spin states and the signature inversion point of the semidecoupled band based on the πh_9/2 1/2^- [541]⊗νi_13/2 configuration has been observed to be 19. 5 (latin small letter h with stroke). The systematic features of the signature inversion in semidecoupled bands in odd-odd rare earth nuclei were summarized. The systematic differences of signature inversion, especially the difference in the energy splitting between the yrast bands and the semidecoupled bands in odd-odd rare earth nuclei are pointed out and discussed for the first time. It seems that p-n interaction between the odd proton and odd neutron in the odd-odd nuclei plays an important role.