N = 14 shell closure in 22O viewed through a neutron sensitive probe.
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.
Becheva
E
E
Institut de Physique Nucléaire, IN2P3-CNRS, 91406 Orsay, France.
Blumenfeld
Y
Y
Khan
E
E
Beaumel
D
D
Daugas
J M
JM
Delaunay
F
F
Demonchy
Ch-E
ChE
Drouart
A
A
Fallot
M
M
Gillibert
A
A
Giot
L
L
Grasso
M
M
Keeley
N
N
Kemper
K W
KW
Khoa
D T
DT
Lapoux
V
V
Lima
V
V
Musumarra
A
A
Nalpas
L
L
Pollacco
E C
EC
Roig
O
O
Roussel-Chomaz
P
P
Sauvestre
J E
JE
Scarpaci
J A
JA
Skaza
F
F
Than
H S
HS