Quadrupole moments of collective structures up to spin similar to 65(h)over-bar in Er-157 and Er-158: A challenge for understanding triaxiality in nuclei
- Wang, X.
- Riley, M. A.
- Simpson, J.
- Paul, E. S.
- Ollier, J.
- Janssens, R. V. F.
- Ayangeakaa, A. D.
- Boston, H. C.
- Carpenter, M. P.
- Chiara, C. J.
- Garg, U.
- Hartley, D. J.
- Judson, D. S.
- Kondev, F. G.
- Lauritsen, T.
- Lumley, N. M.
- Matta, J.
- Nolan, P. J.
- Petri, M.
- Revill, J. P.
- Riedinger, L. L.
- Rigby, S. V.
- Unsworth, C.
- Zhu, S.
- Ragnarsson, Ingemar
DOIAbstract
The transition quadrupole moments. Q(t), of four weakly populated collective bands up to spin similar to 65h in Er-157,Er-158 have been measured to be similar to II eb demonstrating that these sequences are associated with large deformations. However, the data are inconsistent with calculated values from cranked Nilsson-Strutinsky calculations that predict the lowest energy triaxial shape to be associated with rotation about the short principal axis. The data appear to favor either a stable triaxial shape rotating about the intermediate axis or, alternatively, a triaxial shape with larger deformation rotating about the short axis. These new results challenge the present understanding of triaxiality in nuclei. (C) 2011 Elsevier B.V. All righ...
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