Observation of intermediate bands feeding the positive-parity yrast band in 155 Gd

: High-spin states of 155 Gd were populated by using the 154 Sm(α,3nγ) 155 Gd reaction at E α = 33 MeV. γ-γ coincidence, E γ singles, excitation function, and the DCO ratios were measured. we have identified three intermediate bands with Δ I = 2 feeding the positive yrast band. The bands are interpreted as such candidate bands that are mixed with the negative-parity ground state band. This observation can provide a plausible explanation for unusually large population of the positive-parity yrast band observed in a recent Coulomb excitation.