Study of superdeformed bands in nuclei with A ∼ 150 by heavy-ion-γ coincidences.

Superdeformed (SD) bands inDy,Dy andTb have been populated via the 5 n, 6 n and 5 np evaporation channels, respectively, with theS+S n reaction at 160 and 170 MeV bombarding energies. Population intensities are in good agreement with existing data for SD bands inDy and SD yrast band inTb. The excited 'twin' SD band inTb with the same γ-transitions as the band inDy is populated about 5 times more strongly than by the 6 n evaporation channel. This might be explained in terms of competition between proton and γ emission out of an intermediate, excited superdeformed configuration ofDy. [ABSTRACT FROM AUTHOR]