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

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, et al.. Discovery of a new isomeric state in $^{68}$Ni: Evidence for a highly-deformed proton intruder state.. Physical Review C, American Physical Society, 2012, 85, pp.031301. ⟨10.1103/PhysRevC.85.031301⟩. ⟨in2p3-00674624⟩

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