Abstract : Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca42 were determined from E2 matrix elements measured in the first low-energy Coulomb excitation experiment performed with AGATA. The picture of two coexisting structures is well reproduced by new state-of-the-art large-scale shell model and beyond-mean-field calculations. Experimental evidence for superdeformation of the band built on 0+2 has been obtained and the role of triaxiality in the A∼40 mass region is discussed. Furthermore, the potential of Coulomb excitation as a tool to study superdeformation has been demonstrated for the first time.
K. Hadyńska-Klȩk, M. Zielińska, J. Chavas, L. Charles, P. Désesquelles, et al.. Superdeformed and Triaxial States in $^{42}$Ca. Physical Review Letters, American Physical Society, 2016, 117, pp.062501. ⟨10.1103/PhysRevLett.117.062501⟩. ⟨in2p3-01358320⟩
