Vibrational and intruder structures in 116CD

The structure of Cd-116 has been investigated with the (n,n'gamma) reaction. Gamma-ray excitation functions, angular distributions and coincidences have been measured, and the lifetimes of many levels were determined with the Doppler-shift attenuation method. Decay properties of the multiphonon quadrupole vibrational states have been examined and, with the identification of the 4(+) member, the three-phonon quintuplet is now complete. The lifetime of the 2(+) member of the 2-particle, 2-hole band has been determined, exposing the degree of collectivity of this intruder structure. This new information reveals that configuration mixing between intruder and multiphonon vibrational excitations cannot describe the observed decays of the lowest 0(+) excited states.