Abstract
A Coulomb-excitation experiment to study electromagnetic properties of was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro. rays from excited states in were measured with the AGATA spectrometer. The magnitudes and relative signs of ten matrix elements coupling six low-lying states in , including the diagonal matrix elements of and states, were determined using the least-squares code gosia. The obtained set of reduced matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for and states, as well as triaxiality for states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in . The experimental results were compared with the state-of-the-art large-scale shell-model and beyond-mean-field calculations, which reproduce well the general picture of shape coexistence in .
5 More- Received 22 September 2017
DOI:https://doi.org/10.1103/PhysRevC.97.024326
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