title: Superdeformed and Triaxial States in ^{42}Ca.
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.
authors.affiliation: Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL 02-093 Warsaw, Poland.|Faculty of Physics, University of Warsaw, PL 00-681 Warsaw, Poland.|Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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authors.affiliation: Université de Strasbourg, IPHC/CNRS, UMR7178, 23 rue du Loess, F-67037 Strasbourg, France.|GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.|LPMS, Université Constantine 1, Route Ain-El bey, 25000 Constantine, Algeria.
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authors.affiliation: INFN Sezione di Padova, I-35131 Padova, Italy.|Dipartimento di Fisica e Astronomia dell'Università degli Studi di Padova, I-35131 Padova, Italy.
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authors.affiliation: Dipartimento di Fisica dell'Università degli Studi di Milano, I-20133 Milano, Italy.
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authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Kraków, Poland.
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authors.affiliation: Dipartimento di Fisica dell'Università degli Studi di Milano, I-20133 Milano, Italy.
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authors.affiliation: Institut de Physique Nucléaire d'Orsay, F-91400 Orsay, France.
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authors.affiliation: Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL 02-093 Warsaw, Poland.
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authors.affiliation: Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL 02-093 Warsaw, Poland.
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authors.affiliation: Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany.
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authors.affiliation: Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL 02-093 Warsaw, Poland.
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authors.affiliation: Institut de Physique Nucléaire d'Orsay, F-91400 Orsay, France.
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authors.affiliation: Universite Lyon 1, CNRS, IN2P3, IPN Lyon, F-69622 Villeurbanne, France.
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authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Kraków, Poland.
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authors.affiliation: INFN Sezione di Padova, I-35131 Padova, Italy.|Dipartimento di Fisica e Astronomia dell'Università degli Studi di Padova, I-35131 Padova, Italy.
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authors.affiliation: Dipartimento di Fisica dell'Università degli Studi di Milano, I-20133 Milano, Italy.|INFN Sezione di Milano, I-20133 Milano, Italy.
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authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Kraków, Poland.
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authors.affiliation: Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany.
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authors.affiliation: Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL 02-093 Warsaw, Poland.
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authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Kraków, Poland.
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