Non-yrast states of Ce-134 populated in beta-decay

Non-yrast low spin states of the nucleus Ce-134 were studied by means of ga mma-spectroscopy following the beta-decay of Pr. The activity was produced with the reaction Sn-117(F-19, 4n)Pr-134 at the Cologne FN TANDEM accelerat or in the center of the OSIRIS-cube spectrometer. The beta-decay of the gro und and medium spin isomeric states in Pr-134 populates states with spins u p to 8h and excitation energies up to 4.1 MeV in Ce-134. Besides ground and quasi-gamma bands, an excited band based on the 0(2)(+)-state ("K = 0"-ban d), the "K = 4"-band and many other low lying states were observed. The gam ma gamma angular correlations were analyzed to assign spins and parities to the excited states, and to determine the multipolarities of the gamma-tran sitions. We found dominant E2-transitions in the quasi-gamma band and from the gamma to the ground band. The experimental data are compared with calcu lations using the Interacting Boson Model (IBM). Good agreement is reached in the vicinity of the O(6)-limit. (C) 2000 Elsevier Science B.V. All right s reserved.