Investigation of lifetimes in quadrupole bands of 142 Gd

. For a level scheme investigation of 142 Gd an experiment with the γ -spectrometer EUROBALLIII has been carried out and lifetimes have been measured with EUROBALL IV using the Doppler-shift attenuation method. The high-spin states have been populated in these experiments by means of the 99 Ru( 48 Ti, 2p3n) reaction at a beam energy of 240MeV and the 114 Sn( 32 S, 2p2n) reaction at 160MeV, respectively. Reduced E 2 transition probabilities B ( E 2) were determined for 15 members of four quadrupole bands. For the interpretation of the positive-parity even-spin quadrupole bands, calculations in the cranked Nilsson-Strutinsky as well as interacting boson models have been performed. From the former calculations it was concluded that the high-spin states of the (+ , 0) 1 band in 142 Gd represent a triaxial nucleus rotating around the longest principal axis.