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Related Experiment Videos

(68)(28)Ni(40): Magicity versus superfluidity.

O Sorlin1, S Leenhardt, C Donzaud

  • 1Institut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, France.

Physical Review Letters
|February 28, 2002
PubMed
Summary

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This summary is machine-generated.

Researchers measured the B(E2) value for neutron-rich Nickel-68 using Coulomb excitation. The unexpectedly small value suggests proton core excitations and erosion of the N=40 subshell due to neutron scattering.

Area of Science:

  • Nuclear Physics
  • Atomic Physics
  • Quantum Mechanics

Background:

  • Neutron-rich nuclei near closed shells provide crucial insights into nuclear structure.
  • The N=40 subshell is known to be a region of rapid nuclear shape evolution.
  • Previous studies on Ni isotopes have indicated deviations from simple shell models.

Purpose of the Study:

  • To experimentally determine the reduced transition probability B(E2;0+ -> 2+) for neutron-rich Nickel-68.
  • To investigate the role of proton core excitations in the nuclear structure of Ni isotopes.
  • To explore the stability and evolution of the N=40 subshell.

Main Methods:

  • Production of neutron-rich Nickel-66 and Nickel-68 via heavy-ion fusion reactions using a 70Zn beam at GANIL.
  • Measurement of the B(E2) value through intermediate-energy Coulomb excitation using a 208Pb target.

Related Experiment Videos

  • Analysis of experimental data using large-scale shell model calculations.

    • Main Results:

    • The reduced transition probability B(E2;0+ -> 2+) for Nickel-68 was measured for the first time.
    • An unexpectedly small B(E2) value was observed for Nickel-68.
    • Shell model calculations highlighted the significance of proton core excitations in reproducing the observed B(E2) values.

    Conclusions:

    • The experimental results for Nickel-68 challenge simple shell closure predictions at N=40.
    • Proton core excitations play a crucial role in the nuclear structure of these neutron-rich Ni isotopes.
    • The findings suggest an erosion of the N=40 harmonic-oscillator subshell due to neutron-pair scattering, indicating a more complex nuclear landscape than previously assumed.