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

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

2012-02-28

arxiv.org/abs/1202.6154v1

Physical Review C 85 (2012) 031301

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures, accepted for publication in Physical Review C

Scientific paper

10.1103/PhysRevC.85.031301

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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