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

Journal Article · Fri Jan 13 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.012501· OSTI ID:20775008

Becheva, E; Blumenfeld, Y; Khan, E; Beaumel, D; Delaunay, F; Fallot, M; Lima, V; Scarpaci, J A ^[1]; Daugas, J M; Roig, O; Sauvestre, J E ^[2]; Demonchy, Ch-E; Giot, L; Roussel-Chomaz, P ^[3]; Drouart, A; Gillibert, A; Keeley, N; Lapoux, V; Nalpas, L; Pollacco, E C ^[4]

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1. Institut de Physique Nucleaire, IN2P3-CNRS, 91406 Orsay (France)
2. DPTA/SPN-CEA Bruyeres, 91680 Bruyeres-le-Chatel Cedex 12 (France)
3. GANIL (CEA/DSM-CNRS/IN2P3), B.P. 5027, 14076 Caen Cedex (France)
4. SPhN, DAPNIA, CEA Saclay, 91191 Gif sur Yvette Cedex (France)

To investigate the behavior of the N=14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2{sub 1}{sup +} inelastic scattering angular distributions for the neutron-rich nucleus {sup 22}O were measured using the MUr a STrip detector array at the Grand Accelerateur National d'Ions Lourds facility. A deformation parameter {beta}{sub p,p{sup '}}=0.26{+-}0.04 is obtained for the 2{sub 1}{sup +} state, much lower than in {sup 20}O, 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{sub 1}{sup +} state is found close to the N/Z ratio, demonstrating a strong N=14 shell closure in the vicinity of the neutron drip line.

• OSTI ID: 20775008
• Journal Information: Physical Review Letters, Vol. 96, Issue 1; Other Information: DOI: 10.1103/PhysRevLett.96.012501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ELASTIC SCATTERING
HARTREE-FOCK METHOD
HARTREE-FOCK-BOGOLYUBOV THEORY
INELASTIC SCATTERING
NEUTRON-RICH ISOTOPES
NEUTRONS
NUCLEAR FORCES
OPTICAL MODELS
OXYGEN 20
OXYGEN 22
PROTON-NUCLEON INTERACTIONS
PROTONS
RANDOM PHASE APPROXIMATION
SHELL MODELS
SKYRME POTENTIAL