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

摘要

Non-yrast low spin states of the nucleus Ce-134 were studied by means of gamma-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 accelerator in the center of the OSIRIS-cube spectrometer. The beta-decay of the ground and medium spin isomeric states in Pr-134 populates states with spins up 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"-band), the "K = 4"-band and many other low lying states were observed. The gamma gamma angular correlations were analyzed to assign spins and parities to the excited states, and to determine the multipolarities of the gamma-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. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 37]