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The N=14 shell closure in $^{22}$O viewed through a neutron sensitive probe

Abstract : To investigate the behavior of the N=14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2+1 inelastic scattering angular distributions for the neutron-rich nucleus 22O were measured with a secondary beam intensity of only 1200 particles per second using the MUST silicon strip detector array at the GANIL facility. A phenomenological analysis yields a deformation parameter bp;p' = 0.26 +- 0.04 for the 2+1 state, much lower than in 20O, showing a surprisingly weak neutron contribution to this state. A fully microscopic analysis was performed using optical potentials obtained from matter and transition densities generated by continuum Skyrme-HFB and QRPA calculations, respectively. When the present results and those from a 22O + 197Au scattering experiment are combined, the ratio of neutron to proton contributions to the 2+1 state is found close to the N/Z ratio, demonstrating a strong N=14 shell closure in the vicinity of the neutron drip-line.
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Contributor : Muriel Fallot <>
Submitted on : Monday, December 19, 2005 - 6:19:00 PM
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E. Becheva, Y. Blumenfeld, E. Khan, D. Beaumel, J.M. Daugas, et al.. The N=14 shell closure in $^{22}$O viewed through a neutron sensitive probe. Physical Review Letters, American Physical Society, 2006, 96, pp.012501. ⟨10.1103/PhysRevLett.96.012501⟩. ⟨in2p3-00025255⟩



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