Rotational bands of 156Gd Original Research Article

High-spin states of 156Gd have been studied by using the reaction 150Nd(13C,α3n). The ground-state band, γ band, and octupole band have been extended up to 26+, 16+, and 21− states respectively. Gamma-ray branchings between E2 decays down the K=1− band and E1 decays across to the ground band are discussed on the basis of the Generalized Intensity Relations. It is found that the View the MathML source ratios have the maximum value at the intermediate spin. This feature is quite similar to the the case of the lowest octupole K=0− band in 238U and is not yet resolved. Moreover a new band in the spin range of (10,11)⩽I⩽(20,21) was observed, whose γ-rays turned out to be almost identical in energy to the ones found in the isotone 158Dy.