The N=51 91Zr nuclei have two protons and one neutron outside the 88Sr core. The investigations of high-spin level structures in 91Zr would contribute to understand the mechanisms responsible for the generation of high-spin states of nuclei around 88Sr. Previous experiments[1,2] on 91Zr mainly focus on th The N = 51 91Zr nuclei have two protons and one neutron outside the 88Sr core. The investigations of high-spin level structures in 91Zr would contribute to understand the mechanisms responsible for the generation of high-spin states of nuclei around 88Sr. Previous experiments [ 1,2] on 91Zr mainly focus on th