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The nucleus 166Er has been Coulomb excited using beams of 16O, 32S and 58Ni. An almost complete set of reduced E2 matrix elements for the ground- and $\gamma$-bands up to spin 14+ and 12+, respectively, has been measured. A total of 44 E2 matrix elements have been determined in a model-independent way, including the static quadrupole moments up to spin 10+ of the ground band and spin 8+ of the $\gamma$-band. The data are compared with the predictions of geometric collective models and with the IBA-1 model. Overall, the experimental data are well reproduced by both the asymmetric rotor model and the rotation-vibration model. The data slightly favours the latter model and suggest that the collective structure of 166Er can be understood in terms of a varying dynamic triaxiality from $\gamma$ ≈ 18° for the ground state to $\gamma$ ≈ 10° for the higher spin states of the ground band and for the $\gamma$-band. The data also suggest that the Coriolis interaction is strong already at spin 8+ in both the ground band and the $\gamma$-band. \textcopyright 1992.

@article{fahlander_triaxiality_1992, abstract = {The nucleus 166Er has been Coulomb excited using beams of 16O, 32S and 58Ni. An almost complete set of reduced E2 matrix elements for the ground- and $\gamma$-bands up to spin 14+ and 12+, respectively, has been measured. A total of 44 E2 matrix elements have been determined in a model-independent way, including the static quadrupole moments up to spin 10+ of the ground band and spin 8+ of the $\gamma$-band. The data are compared with the predictions of geometric collective models and with the IBA-1 model. Overall, the experimental data are well reproduced by both the asymmetric rotor model and the rotation-vibration model. The data slightly favours the latter model and suggest that the collective structure of 166Er can be understood in terms of a varying dynamic triaxiality from $\gamma$ ≈ 18° for the ground state to $\gamma$ ≈ 10° for the higher spin states of the ground band and for the $\gamma$-band. The data also suggest that the Coriolis interaction is strong already at spin 8+ in both the ground band and the $\gamma$-band. {\textcopyright} 1992.}, author = {Fahlander, C. and Thorslund, I. and Varnestig, B. and B{\"{a}}cklin, A. and Svensson, L. E. and Disdier, D. and Kraus, L. and Linck, I. and Schulz, N. and Pedersen, J. and Cline, D.}, doi = {10.1016/0375-9474(92)90164-F}, issn = {03759474}, journal = {Nuclear Physics, Section A}, keywords = {,Nuclear reactions}, month = {feb}, number = {1-2}, pages = {183--206}, title = {{Triaxiality in 166Er}}, volume = {537}, year = {1992} }

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