Shape coexistence and the role of axial asymmetry in 72Ge
oleh: A.D. Ayangeakaa, R.V.F. Janssens, C.Y. Wu, J.M. Allmond, J.L. Wood, S. Zhu, M. Albers, S. Almaraz-Calderon, B. Bucher, M.P. Carpenter, C.J. Chiara, D. Cline, H.L. Crawford, H.M. David, J. Harker, A.B. Hayes, C.R. Hoffman, B.P. Kay, K. Kolos, A. Korichi, T. Lauritsen, A.O. Macchiavelli, A. Richard, D. Seweryniak, A. Wiens
| Format: | Article |
|---|---|
| Diterbitkan: | Elsevier 2016-03-01 |
Deskripsi
The quadrupole collectivity of low-lying states and the anomalous behavior of the 02+ and 23+ levels in 72Ge are investigated via projectile multi-step Coulomb excitation with GRETINA and CHICO-2. A total of forty six E2 and M1 matrix elements connecting fourteen low-lying levels were determined using the least-squares search code, gosia. Evidence for triaxiality and shape coexistence, based on the model-independent shape invariants deduced from the Kumar–Cline sum rule, is presented. These are interpreted using a simple two-state mixing model as well as multi-state mixing calculations carried out within the framework of the triaxial rotor model. The results represent a significant milestone towards the understanding of the unusual structure of this nucleus.