The low-lying quadrupole collective excitations of Ru and Pd isotopes

Quadrupole excitations of even-even Ru and Pd isotopes are described within a microscopic approach based on the general collective Bohr model which in cludes the effect of coupling with the pairing vibrations, The excitation e nergies and E2 transition probabilities observed in Ru104-114 and Pd106-110 are reproduced in the frame of the calculation containing no free paramete rs. Particularly interesting are Ru-104 and Pd106-110 where good agreement to very rich information based on Coulomb excitation experiments is achieve d. (C) 1999 Elsevier Science B.V. All rights reserved.