Discovery of a new isomeric state in $^{68}$Ni: Evidence for a highly-deformed proton intruder state

A. Dijon; E. Clément; G. De France; G. De Angelis; G. Duchêne; J. Dudouet; S. Franchoo; A. Gadea; A. Gottardo; T. Hüyük; B. Jacquot; A. Kusoglu; D. Lebhertz; G. Lehaut; M. Martini; D. R. Napoli; F. Nowacki; S. Péru; A. Poves; F. Recchia; N. Redon; E. Sahin; C. Schmitt; M. Sferrazza; K. Sieja; O. Stezowski; J. J. Valiente-Dobon; A. Vancraeyenest; Y. Zheng

doi:10.1103/physrevc.85.031301

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arXiv · 1202.6154

Discovery of a new isomeric state in $^{68}$Ni: Evidence for a highly-deformed proton intruder state

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Abstract

We report on the observation of a new isomeric state in $^{68}$Ni. We suggest that the newly observed state at 168(1) keV above the first 2$^+$ state is a $\pi(2p-2h)$ 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.

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A. Dijon, E. Clément, G. De France, G. De Angelis, G. Duchêne, J. Dudouet, S. Franchoo, A. Gadea, A. Gottardo, T. Hüyük, B. Jacquot, A. Kusoglu, D. Lebhertz, G. Lehaut, M. Martini, D. R. Napoli, F. Nowacki, S. Péru, A. Poves, F. Recchia, N. Redon, E. Sahin, C. Schmitt, M. Sferrazza, K. Sieja, O. Stezowski, J. J. Valiente-Dobon, A. Vancraeyenest, Y. Zheng. 2012-02-28. Discovery of a new isomeric state in $^{68}$Ni: Evidence for a highly-deformed proton intruder state. https://doi.org/10.1103/physrevc.85.031301

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