Selective studies of the excited rotational bands in the superdeformed nucleus Tb151

The experimental study of the unresolved rotational bands, forming ridge structures in gamma-gamma spectra, has been performed on the superdeformed nucleus Tb-151. gamma transitions from the reaction Al-27, at 155 MeV, on Te-130 were measured with EUROBALL IV in high fold coincidence. The analysis of the intensities and count fluctuations of the ridge structures shows the existence of approximate to 30 discrete rotational bands of superdeformed nature, half of which is in direct coincidence with the superdeformed yrast band. A comparison with band mixing model predictions and with a previous work on the superdeformed nucleus Eu-143 is presented.