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Scheck, M. Seidlitz, M. Zieli\\'nska, N. Bree, N. Kesteloot, N. Warr, O. Ivanov, P. A. Butler, P.-H. Heenen, P. Peura, P. Rahkila, P. Reiter, P. Van Duppen, R. Orlandi, R. Wadsworth, S. J. Freeman, S. Martin-Haugh, T. Davinson, T. E. Cocolios, T. Grahn, Th. Kr\\\"oll, U. Jakobsson, V. Kumar","submitted_at":"2015-03-11T09:49:41Z","abstract_excerpt":"Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around $Z=82$ and the neutron mid-shell at $N=104$.\n  Purpose: Evidence for shape coexistence has been inferred from $\\alpha$-decay measurements, laser spectroscopy and in-beam measurements. 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