Non-yrast states of 134Ce populated in β-decay Original Research Article

Non-yrast low spin states of the nucleus 134Ce were studied by means of γ-spectroscopy following the β-decay of 134Pr. The activity was produced with the reaction 117Sn(19F, 4n)134Pr at the Cologne fn tandem accelerator in the center of the osiris-cube spectrometer. The β-decay of the ground and medium spin isomeric states in 134Pr populates states with spins up to 8ℏ and excitation energies up to 4.1 MeV in 134Ce. Besides ground and quasi-gamma bands, an excited band based on the View the MathML source-state (“K=0”-band), the “K=4”-band and many other low lying states were observed. The γγ angular correlations were analyzed to assign spins and parities to the excited states, and to determine the multipolarities of the γ-transitions. We found dominant E2-transitions in the quasi-gamma band and from the gamma to the ground band. The experimental data are compared with calculations using the Interacting Boson Model (IBM). Good agreement is reached in the vicinity of the O(6)-limit.