Shell model description of normal parity bands in even-even heavy deformednuclei - art. no. 064313

The pseudo-SU(3) model is used to describe the low-energy spectra and elect romagnetic transition strengths in Gd-156, Gd-158, and Gd-160. The Hamilton ian includes spherical single-particle energies, the quadrupole-quadrupole interaction, proton and neutron pairing interactions, plus four rotorlike t erms. The quadrupolequadrupole and pairing interaction strengths are assign ed the values chi = 23A(-5/3) and G(pi) = 21/A, G(nu) = 17/A, respectively. The single-particle energies were taken from experiment but scaled to yiel d an overall best fit. For the other four rotorlike terms, which do not mix SU(3) representations and induce only small changes in the spectra, a cons istent set of parameters is given. The basis states are built as linear com binations of SU(3) states which are the direct product of SU(3) proton and neutron states with pseudospin zero. The results are in good agreement with experimental data, demonstrating the suitability of the model to describe heavy deformed nuclei.