Discovery of a new isomeric state in 68Ni: Evidence for a highly-deformed proton intruder state
Abstract
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.
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