Collective band structures in doubly odd ¹³⁶La nucleus

Using heavy-ion nuclear reaction and in-beam γ-ray spectroscopy technique, high spin states of ¹³⁶La have been studied. The nuclear reaction used is ¹³⁰Te(¹¹B, 5n) with a beam energy 60 MeV. The level scheme with three collective band structures has been updated with spin up to 20ℏ The collective backbending has been observed in πh_11/2 ⊗vh_11/2 band. According to the TRS calculations, this backbending is due to the alignment of a pair of h_11/2 neutrons. The signature splitting and inversion for the πh_11/2⊗vh_11/2 band were also discussed. Other two bands based on 12^- and 16⁺ levels were proposed as oblate deformation with γ ≈ 60°. They most probably originate from four-and six- quasiparticle configurations, that is, πh_11/2 ⊗vg_7/2h_11/2² and πg_7/2 ⊗vg_7/2² d_5/2h_11/2² respectively.