Abstract
The γ-decay from the evaporation residues formed in the 50Ti + 50Ti → 100Ru ★ and 50Ti+ 110Pd → 160Er ★ reactions with angular momentum up to the maximum these systems can sustain, has been studied utilizing a sum spectrometer in coincidence with two smaller NaI detectors. The excitation energy and average angular momentum are determined as a function of γ-ray cascade energy. Simultaneously, the structure of the γ-ray continuum and its multipolarity is obtained as a function of these two correlated parameters. From the centroid energy of quadrupole transitions between states confined to a narrow spin region an effective moment of inertia is extracted. For the products of the 100Ru compound system a large deformation, is indicated by a moment of inertia as large as 1.3 times the spherical rigid-body value for I ≳ 40 ƒ. This is considerably lower in angular momentum than the transition to triaxial shape predicted for a rotating liquid drop. The moment of inertia for the residues of the 160Er compound system is 5–15 % larger than the spherical rigid body value. For both systems studied a considerable part of the decay is due to dipole transitions of rather low energy (< 1 MeV) even at the highest spins where a quadrupole bump is well developed.
Published Version
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