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Evolution of the N=50 gap from Z=30 to Z=38 and extrapolation towards 78Ni

M. -G. Porquet 1 O. Sorlin 2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : The evolution of the N=50 gap is analyzed as a function of the occupation of the proton f5/2 and p3/2 orbits. It is based on experimental atomic masses, using three different methods of one or two-neutron separation energies of ground or isomeric states. We show that the effect of correlations, which is maximized at Z=32 could be misleading with respect to the determination of the size of the shell gap, especially when using the method with two-neutron separation energies. From the methods that are the least perturbed by correlations, we estimate the N=50 spherical shell gap in 78Ni. Whether 78Ni would be a rigid spherical or deformed nucleus is discussed in comparison with other nuclei in which similar nucleon-nucleon forces are at play.
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Submitted on : Friday, January 6, 2012 - 8:35:20 AM
Last modification on : Wednesday, October 14, 2020 - 3:59:52 AM

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M. -G. Porquet, O. Sorlin. Evolution of the N=50 gap from Z=30 to Z=38 and extrapolation towards 78Ni. Physical Review C, American Physical Society, 2012, 85, pp.014307. ⟨10.1103/PhysRevC.85.014307⟩. ⟨in2p3-00657190⟩



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