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Shape coexistence and the role of axial asymmetry in 72Ge
- Ayangeakaa, AD;
- Janssens, RVF;
- Wu, CY;
- Allmond, JM;
- Wood, JL;
- Zhu, S;
- Albers, M;
- Almaraz-Calderon, S;
- Bucher, B;
- Carpenter, MP;
- Chiara, CJ;
- Cline, D;
- Crawford, HL;
- David, HM;
- Harker, J;
- Hayes, AB;
- Hoffman, CR;
- Kay, BP;
- Kolos, K;
- Korichi, A;
- Lauritsen, T;
- Macchiavelli, AO;
- Richard, A;
- Seweryniak, D;
- Wiens, A
- et al.
Published Web Location
https://doi.org/10.1016/j.physletb.2016.01.036Abstract
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.
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