Observation of signature inversion in odd-odd 178Ir
High spin states in 178Ir have been studied via the 152Sm(31P,5nγ)178Ir reaction through excitation functions, X-γ and γ-γ-t coincidence measurements. According to the band structure characteristics and the measured intraband B(M1)/B(E2) ratios, two rotational bands are identified and assigned to be associated with the πh9/2⊗υi13/2 and πh11/2⊗υi13/2 configurations, respectively. Both bands show the signature inversion feature.