학술논문
Shape coexistence and the role of axial asymmetry in $^{72}$Ge
Document Type
Working Paper
Author
Ayangeakaa, A. D.; Janssens, R. V. F.; Wu, C. Y.; Allmond, J. M.; Wood, J. L.; Zhu, S.; Albers, M.; Almaras-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.
Source
Phys. Lett. B 754, 254 (2016)
Subject
Language
Abstract
The quadrupole collectivity of low-lying states and the anomalous behavior of the $0^+_2$ and $2^+_3$ 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 multistate 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.
Comment: 7 pages and 7 figures
Comment: 7 pages and 7 figures