- Conference date: 10-15 Aug 1998
- Location: Gatlinburg, Tennesse (USA)
The high spin states of and have been investigated with GAMMASPHERE at ATLAS, using Coulomb excitation with a beam at energies above the Coulomb barrier. Data on a transfer channel leading to were obtained as well. In the case of the yrast band was extended to 34ℏ, revealing the completed alignment, a “first” for actinide nuclei. The yrast sequence of was also extended to higher spin and a similar backbend was delineated. In contrast, while the ground state band of was measured up to the highest rotational frequencies ever reported in the actinide region (∼300 keV), no sign of particle alignment was observed. In this case, several observables such as the large B(E1)/B(E2) branching ratios in the negative parity band, and the vanishing energy staggering between the negative and positive parity bands suggest that the strength of octupole correlations increases with rotational frequency. These stronger correlations may well be responsible for delaying or suppressing the particle alignment.
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