Shape coexistence and the role of axial asymmetry in 72Ge
- Ayangeakaa, A.D.
- Janssens, R.V.F.
- Wu, C.Y.
- Allmond, J.M.
- Wood, J.L.
- Zhu, S.
- Albers, M.
- Almaraz-Calderon, S.
- Bucher, B.
- Carpenter, M.P.
- Chiara, C.J.
- Cline, D.
- Crawford, H.L.
- David, H.M.
- Harker, J.
- Hayes, A.B.
- Hoffman, C.R.
- Kay, B.P.
- Kolos, K.
- Korichi, A.
- Lauritsen, T.
- Macchiavelli, A.O.
- Richard, A.
- Seweryniak, D.
- Wiens, A.
DOIAbstract
AbstractThe 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 ...
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