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The proton-rich isotope 146Ho was produced via the fusion-evaporation reaction 92Mo (58Ni,3p1n).The β-delayed proton decay of 146Ho was studied by proton-γ coincidence measurements using a He-jet tape transport system.The γ-transitions in 145Tb following the proton emissions were observed,and the β-delayed proton branching ratios to the final states in the grand-daughter nucleus 145Tb were determined.According to the relative branching ratios,the ground-state spin of 146Ho has been proposed and the possible configuration discussed.