$_{28}^{68}$Ni$_{40}$: Magicity versus superfluidity

Abstract : The neutron-rich $^{66,68}$Ni have been produced at GANIL via interactions of a 65.9A MeV $^{70}$Zn beam with a $^{58}$Ni target. Their reduced transition probability $B(E2$;$0_1^+\rightarrow$2$^+$ has been measured for the first time by Coulomb excitation in a $^{208}$Pb target at intermediate energy. The $B(E2)$ value for $^{68}$Ni$_{40}$ is unexpectedly small. An analysis in terms of large scale shell model calculations stresses the importance of proton core excitations to reproduce the $B(E2)$ values and indicates the erosion of the $N$ = 40 harmonic-oscillator subshell by neutron-pair scattering.
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O. Sorlin, S. Leenhard, C. Donzaud, J. Duprat, F. Azaiez, et al.. $_{28}^{68}$Ni$_{40}$: Magicity versus superfluidity. Physical Review Letters, American Physical Society, 2002, 88, pp.092501-1-092501-5. ⟨10.1103/PhysRevLett.88.092501⟩. ⟨in2p3-00013604⟩

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