Physics Letters B (Mar 2016)
Shape coexistence and the role of axial asymmetry in 72Ge
- A.D. Ayangeakaa,
- R.V.F. Janssens,
- C.Y. Wu,
- J.M. Allmond,
- J.L. Wood,
- S. Zhu,
- M. Albers,
- S. Almaraz-Calderon,
- B. Bucher,
- M.P. Carpenter,
- C.J. Chiara,
- D. Cline,
- H.L. Crawford,
- H.M. David,
- J. Harker,
- A.B. Hayes,
- C.R. Hoffman,
- B.P. Kay,
- K. Kolos,
- A. Korichi,
- T. Lauritsen,
- A.O. Macchiavelli,
- A. Richard,
- D. Seweryniak,
- A. Wiens
Affiliations
- A.D. Ayangeakaa
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- R.V.F. Janssens
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- C.Y. Wu
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
- J.M. Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- J.L. Wood
- School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA
- S. Zhu
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- M. Albers
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- S. Almaraz-Calderon
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- B. Bucher
- Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
- M.P. Carpenter
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- C.J. Chiara
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- D. Cline
- Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA
- H.L. Crawford
- Institute of Nuclear and Particle Physics, Department of Physics and Astronomy, Ohio University, Athens, OH 45701, USA
- H.M. David
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- J. Harker
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- A.B. Hayes
- Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA
- C.R. Hoffman
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- B.P. Kay
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- K. Kolos
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- A. Korichi
- Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse CSNSM, CNRS/IN2P3 and Université Paris-Sud, F-91405 Orsay Campus, France
- T. Lauritsen
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- A.O. Macchiavelli
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- A. Richard
- Institute of Nuclear and Particle Physics, Department of Physics and Astronomy, Ohio University, Athens, OH 45701, USA
- D. Seweryniak
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- A. Wiens
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- DOI
- https://doi.org/10.1016/j.physletb.2016.01.036
- Journal volume & issue
-
Vol. 754,
no. C
pp. 254 – 259
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.
