Collective Bands In Mo-104,Mo-106,Mo-108

We have used our analysis of gamma-gamma-gamma data (5.7 x 10(11) triples and higher folds) taken with Gammasphere from prompt gamma rays emitted in the spontaneous fission of Cf-251 to study the collective bands in Mo-104,Mo-106,Mo-108. The one-phonon and two-phonon gamma-vibrational bands and known two-quasiparticle bands in neutron-rich Mo-104,Mo-106 were extended to higher spins. The one- and two-phonon gamma-vibrational bands have remarkably close energies for transitions from the same spin states and identical moments of inertia. Several new bands are observed and are proposed as quasiparticle bands in Mo-104,Mo-106, along with the first 3-type vibrational band in Mo-106. The quasiparticle bands have essentially constant moments of inertia near the rigid-body value that indicate blocking of the pairing interaction. Candidates for chiral doublet bands in Mo-106 are strong. These are the first reported chiral vibrational bands in an even-even nucleus.