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Collective and intrinsic motions in complex-deformed nuclei
Par : Dr. Nikolay Minkov, Institute of Nuclear Research and Nuclear Energy, Sofia, Bulgaria
Date : mardi 18 octobre 2011 à 14h00
Lieu : IPHC, Salle de Réunion 2e étage du Bâtiment 27
Model developments aiming to explain fine dynamical effects in the structure of complexdeformed nuclei will be presented. The formalism is applied to describe the energy and electromagnetic properties of nuclei covering the regions of relatively stable and soft quadrupoleoctupole deformations. In the limit of pronounced octupole collectivity the model describes octupole vibrations and rotations of the quadrupole-octupole deformed shape determined by a point-symmetry based Hamiltonian . The “beat” odd-even staggering structure of the octupole bands in light actinide nuclei is reproduced. In the “soft” limit a twodimensional potential providing coherent oscillations of the system with respect to the axial quadrupole and octupole variables 2 and 3 is considered . The alternating-parity spectra and B(E1), B(E2), B(E3) transition probabilities in rare-earth and actinide nuclei are described. In odd-A nuclei the Coriolis interaction is considered and split parity-doublet spectra in a wide range of nuclei are reproduced . The microscopic calculation of the decoupling factor through the reflection-asymmetric deformed shell model (DSM) provides an estimation for the quadrupole-octupole deformations of odd-A nuclei . The influence of the octupole deformation on the structure of high-K isomeric states in even-even actinide nuclei is studied through DSM. A pronounced sensitivity of the magnetic moments to the octupole deformation is found . A possibly important role for high-K isomers in determining the octupole deformation is suggested.
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