Abstract
Angular distributions of photons associated with the damping of excited-state giant dipole resonances (GDR) in hot and rotating 161,162Yb nuclei have been measured in exclusive experiments using the HECTOR array. In reactions with heavy ions ( 48T) angular distributions are determined as a function of the angular momentum of the compound nuclei. In reactions with lighter ions ( 17,18O) a difference method is applied to isolate GDR decays originating from specific excitation regions. The systematics of the measured angular distributions as a function of excitation energy and angular momentum are compared to theories taking into account fluctuations of the shape and orientation of the excited nuclei.
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