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Shape coexistence and the role of axial asymmetry in 72Ge

Abstract : The quadrupole collectivity of low-lying states and the anomalous behavior of the 0(2)(+) and 2(3)(+) levels in Ge-72 are investigated via projectile multi-step Coulomb excitation with GRETINA and CHICO-2. Atotal 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. (C) 2016 The Authors. Published by Elsevier B.V.
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Submitted on : Tuesday, April 5, 2016 - 10:22:41 AM
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A.D. Ayangeakaa A., R.V.F. Janssens, C.Y. Wu, J.M. Allmond, J.L. Wood, et al.. Shape coexistence and the role of axial asymmetry in 72Ge. Physics Letters B, Elsevier, 2016, 754 (754), pp.254-259. ⟨10.1016/j.physletb.2016.01.036⟩. ⟨in2p3-01297897⟩