Shape coexistence and the role of axial asymmetry in 72 Ge

The quadrupole collectivity of low-lying states and the anomalous behavior of the 02+ and 23+ levels in 72 Ge 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 us...

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Bibliographic Details
Published in:Physics letters. B 2016-03, Vol.754 (C)
Main Authors: 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.
Format: Article
Language:English
Subjects:
NUCLEAR PHYSICS AND RADIATION PHYSICS
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Summary:The quadrupole collectivity of low-lying states and the anomalous behavior of the 02+ and 23+ levels in 72 Ge 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.
ISSN:0370-2693
1873-2445