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

A. Dijon (GANIL); A. Gadea; A. Gottardo; A. Kusoglu; A. Poves; A. Vancraeyenest (IPNL); B. Jacquot (GANIL); C. Schmitt (GANIL); D. Lebhertz (GANIL); D.R. Napoli

arxiv: 1202.6154 · v1 · pith:OSLRQBHLnew · submitted 2012-02-28 · ⚛️ nucl-ex

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

A. Dijon (GANIL) , E. Cl\'ement (GANIL) , G. De France (GANIL) , G. de Angelis , G. Duch\^ene (IPHC) , J. Dudouet (GANIL) , S. Franchoo (IPNO) , A. Gadea

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A. Gottardo T. H\"uy\"uk B. Jacquot (GANIL) A. Kusoglu D. Lebhertz (GANIL) G. Lehaut (IPNL) M. Martini (CEA DIF) D.R. Napoli F. Nowacki (IPHC) S. P\'eru (CEA DIF) A. Poves F. Recchia N. Redon (IPNL) E. Sahin C. Schmitt (GANIL) M. Sferrazza K. Sieja (IPHC) O. Stezowski (IPNL) J.J. Valiente-Dobon A. Vancraeyenest (IPNL) Y. Zheng (GANIL)

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keywords stateintruderisomericprotonaboveacrosscalculationscoexistence

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

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