QUADRUPOLE AND HEXADECAPOLE VIBRATIONAL EXCITATIONS IN DEFORMED-NUCLEI

Energies, wave functions of the quadrupole and hexadecapole states, B( E lambda) and B(M1) values are calculated within the quasiparticle-pho non nuclear model in a number of well-deformed even-even nuclei in the rare earth region. Reasonably good overall agreement with available e xperimental data is obtained. Specific properties of the K-pi = 0(+) a nd two-gamma vibrational states are discussed. The distribution of the M1 strength is studied. It is shown that the M1 strength is more stro ngly fragmented in Er isotopes compared to Gd and Dy isotopes. The fra gmentation of one-and two-phonon states is investigated. The fragmenta tion of one-phonon states strongly affects the EX and M1 strength dist ribution at energies above 2.5-3.0 MeV. The wave functions in the ener gy range 2-4 MeV contain specific nuclear structure information and th ese states cannot be treated as chaotic.