High-Spin States in the Odd-Proton Nucleus¹³⁵Pm

High-spin states in the odd-proton nucleus ¹³⁵Pm have been investigated using the ¹⁰⁷Ag(³²S, 2p2n)¹³⁵Pm reaction. Seven rotational bands have been observed in ¹³⁵Pm. The yrast band based on a decoupled h_11/2 proton is found to have a band crossing ω_c ～ 0.43MeV/ħ. Two positive-parity bands based on the two signature components of the πg_7/25/2⁺413 Nilsson orbital have been observed in the main sidebands. The favoured band with (π,α)=(+,-1/2) has been shown to populate below the first pair of proton alignment. Both bands have shown upbend at ω₁ ～ 0.26 MeV/ħ and ω₂ ～ 0.43 MeV/ħ. These crossing frequencies can be attributed to the decoupling of the first pair of H_11/2 quasi-proton and H_11/2 quasi-neutron, respectively. Four weaker bands have been observed in sidebands too. Among them, two states are possibly built on a πd_5/23/2⁺411configuration.