Shape coexistence and the role of axial asymmetry in 72Ge
A.D. Ayangeakaa, R.V.F. Janssens, C.Y. Wu and 22 more
Physics Letters B · 2016
doi:10.1016/j.physletb.2016.01.036 (opens in a new tab)
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Abstract
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.
Abstract licence: CC BY
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