No abstract

No abstract

The M 1 transition and ground state spectra of the even-even 160-164 Dy and 156-160 Gd isotopes are calculated within the framework of the microscopic pseudo-SU͑3͒ shell model. A reasonable description of the M 1 strength function, including its fragmentation, is obtained with an interaction that includes collective as well as single-particle and pairing terms with the parameters of the theory fit to the energy spectrum and E2 transition strengths. ͓S0556-2813͑98͒04403-3͔

No abstract

The Elliott SU (3) model, extended via pseudo-spin for heavy nuclei, is used to study low-lying magnetic dipole excitations in deformed nuclei. Proton and neutron degrees of freedom are handled explicitly and the system Hamiltonian includes single-particle energies as well as quadrupole-quadrupole and pairing two-body interactions. The calculated excitation spectra and M1 strength distribution of the strongly deformed even-even 156−160 Gd isotopes are shown to be in good agreement with experimental results. Results for the γ-unstable (soft rotor) 196 Pt nucleus and the even-odd 163 Dy system are also reported and found to compare favourably with the available experimental data, demonstrating the ability of the model to describe very different types of systems.