N = 14 Shell Closure in O 22 Viewed through a Neutron Sensitive Probe

2006/01/04 by E. Becheva, Y. Blumenfeld, E. Khan +28 · 5 citations
Physics and Astronomy · Engineering · #Nuclear physics research studies #Nuclear Physics and Applications #Nuclear reactor physics and engineering

paper · doi:10.1103/physrevlett.96.012501

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 using the MUr à STrip detector array at the Grand Accélérateur National d'Ions Lourds facility. A deformation parameter beta(p,p') = 0.26 +/- 0.04 is obtained for the 2(1)+ state, much lower than in 20O, showing a weak neutron contribution to this state. A microscopic analysis was performed using matter and transition densities generated by continuum Skyrme-Hartree-Fock-Bogoliubov and quasiparticle random phase approximation calculations, respectively. 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.

Citations

• Evolution of Nuclear Shells due to the Tensor Force
• Magic Numbers in Exotic Nuclei and Spin-Isospin Properties of the NN Interaction

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