학술논문
Quadrupole Moments of Collective Structures up to Spin $\sim$ $65\hbar$ in $^{157}$Er and $^{158}$Er: A Challenge for Understanding Triaxiality in Nuclei
Document Type
Working Paper
Author
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.; Matta, J.; Nolan, P. J.; Petri, M.; Revill, J. P.; Riedinger, L. L.; Rigby, S. V.; Unsworth, C.; Zhu, S.; Ragnarsson, I.
Source
Phys.Lett.B702:127-130,2011
Subject
Language
Abstract
The transition quadrupole moments, $Q_{\rm t}$, of four weakly populated collective bands up to spin $\sim$ $65\hbar$ in $^{157,158}$Er have been measured to be ${\sim}11 {\rm eb}$ 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.
Comment: 6 pages, 5 figures, Phys. Lett. B, in press
Comment: 6 pages, 5 figures, Phys. Lett. B, in press