One- and two-phonon excitations in strongly deformed triaxial nuclei

The wobbling mode is uniquely related to triaxiality and introduces a series of bands with increasing wobbling phonon number, nω, and a characteristic large Δnω=1 E2 strength between the bands. The pattern of γ-transitions between the wobbling excitations will be influenced by the presence of an aligned particle. Evidence for the wobbling mode was obtained recently, and even a two-phonon wobbling excitation has now been identified in 163Lu. The similarity of the data in 163Lu to new strongly deformed triaxial bands and connecting transitions in the neighbouring nuclei, 165Lu and 167Lu, establishes wobbling as a more general phenomenon in this region. (author)