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Updated: Mar 16, 2026

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Superdeformed and Triaxial States in ^{42}Ca
K Hadyńska-Klȩk1,2,3, P J Napiorkowski1, M Zielińska1,4
1Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL 02-093 Warsaw, Poland.
Abstract:
Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in ^{42}Ca 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.
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