DESCRIPTION OF LOW-LYING VIBRATIONAL-STATES AND GAMMA-RAY TRANSITIONSBETWEEN EXCITED-STATES IN GD-156 AND GD-158

The energies and wave functions of the nonrotational states below 2.3 MeV in Gd-156 and Gd-157 are calculated within the quasiparticle-phono n nuclear model. It is shown that the wave functions have the dominati ng one-phonon component. The contribution of the two-phonon configurat ions to the wave function of the excited states is less than 10%. The calculated excitation energies and B(E; lambda = 2, 3, 4) values for t ransition from the ground state are found to be in agreement with expe rimental data. High intensities of the one-nucleon transfer reactions are explained by the corresponding large two-quasiparticle components of the one-phonon terms of the wave functions. The calculated intensit ies and reduced probabilities of the E1, E2, and MI transitions betwee n excited states are in reasonably good overall agreement with experim ental data.