THE ANGULAR-DISTRIBUTION OF GAMMA-RAYS FROM THERMAL HIGH-SPIN GIANT-DIPOLE-RESONANCES ON SUPERDEFORMED STATES

The microscopic approach with thermal RPA based on thermal CHFB ensemb le is applied to the analysis of the angular distribution coefficient of gamma-rays, a2(E(gamma)), in addition to the spectrum shapes of sig ma(abs)(E(gamma)), both for the ground band with small prolate deforma tion and for the superdeformed band in Ce-132. The critical gamma-ray energy where a2(E(gamma)) changes its sign is much lower for the super deformed band than for the ground band. Thermal energy-weighted sum-ru le gives an account for the decrease of the peak height of sigma(abs)( E(gamma)) with increasing temperature.