N = 14 Shell Closure in O 22 Viewed through a Neutron Sensitive Probe
2006; American Physical Society; Volume: 96; Issue: 1 Linguagem: Inglês
10.1103/physrevlett.96.012501
ISSN1092-0145
AutoresE. Becheva, Y. Blumenfeld, E. Khan, D. Beaumel, J. M. Daugas, F. Delaunay, C. E. Demonchy, A. Drouart, M. Fallot, A. Gillibert, L. Giot, M. Grasso, N. Keeley, K. W. Kemper, Dao T. Khoa, V. Lapoux, V. Franco Lima, A. Musumarra, L. Nalpas, E. C. Pollacco, O. Roig, P. Roussel‐Chomaz, J. E. Sauvestre, J. A. Scarpaci, F. Skaza, Hoang Sy Than,
Tópico(s)Nuclear reactor physics and engineering
ResumoTo 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.
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