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Discovery of a new isomeric state in 68Ni: Evidence of a highly deformed proton intruder state

par Dijon, A;Clément, E.;de France, Gilles;De Angelis, G.;Duchêne, Gaspard;Dudouet, J;Franchoo, Serge;Gadea, A;Gottardo, A;Hüyük, T;Jacquot, B;Kusoglu, A;Lebhertz, D;Lehaut, G;Martini, M;Napoli, D R;Nowacki, F.;Péru, S.;Poves, A.;Recchia, F;Redon, N.;Sahin, E;Schmitt, Christian;Sferrazza, Michele ;Sieja, K;Stezowski, O;Valiente-Dobon, J.J.;Vancreayenest, A;Zheng, Yan
Référence Physical review. C, Nuclear physics, 85, page (031301)
Publication Publié, 2012

Article révisé par les pairs

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Résumé :

We report on the observation of a new isomeric state in 68Ni. We suggest that the newly observed state at 168(1) keV above the first 2 + state is a π(2p-2h) 0 + state across the major Z=28 shell gap. Comparison with theoretical calculations indicates a pure proton intruder configuration and the deduced low-lying structure of this key nucleus suggests a possible shape coexistence scenario involving a highly deformed state. © 2012 American Physical Society.