LOW-LYING SPECTRA AND E2 TRANSITION RATES IN EVEN-EVEN Pd ISOTOPES IN THE INTERACTING BOSON MODEL

摘要

The positive parity collective states in the even-even ~100Pd-~116Pd isotopes are studied in the framework of the interacting boson model. A schematic Hamiltonian capable of describing their spectra and transition is used. It is found that the spectra can be well described by a U(5) plus SU(3) perturbation interaction. As the valence neutron number changes, the structure of the isotopes shows regular patterns of change. In the meantime, the behaviour of 0~+_2 can also be partially described by the model