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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. While the latter allow the pattern of excited states and rotational band structures to be mapped out, a detailed understanding of shape coexistence can only com","authors_text":"A. Blazhev, A. Ekstr\\\"om, A. N. Andreyev, A. N. Deacon, A. Petts, A. P. Robinson, B. Bruyneel, B. Hadinia, Ch. Fransen, D. DiJulio, D. G. Jenkins, D. M\\\"ucher, D. Voulot, F. Wenander, H. de Witte, H. Hess, J. Diriken, J. F. Smith, J. Konki, J. Pakarinen, J. Van de Walle, K. Geibel, K. Singh, K. Wimmer, K. Wrzosek-Lipska, L. P. Gaffney, M. Bender, M. Hass, M. Huyse, M. 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. 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