Eur. Phys. J. A (2003) 20: 183-188
https://doi.org/10.1140/epja/i2002-10349-4

Wobbling phonon excitations in strongly deformed triaxial nuclei

The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100, Copenhagen Ø, Denmark

^* e-mail: hagemann@nbi.dk

Abstract

The wobbling mode is uniquely related to triaxiality and introduces a series of bands with increasing wobbling phonon number, . The pattern of -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 ¹⁶³ Lu. The similarity of the data in ¹⁶³ Lu to new strongly deformed triaxial bands and connecting transitions in the neighbouring nuclei, ¹⁶⁵ Lu and ¹⁶⁷ Lu, establishes wobbling as a more general phenomenon in this region. The higher phonon wobbling excitations show some anharmonicity, but the characteristic large E2 strength is observed. The wobbling interpretation is based on the comparison of electromagnetic decay strength between bands to particle-rotor calculations in which an i _13/2 proton is coupled to a triaxial core.