Isovector deformation and its link to the neutron shell closure
Institute for Nuclear Science & Technique, P.O. Box 5, VAEC, Hanoi, Vietnam
Corresponding author: email@example.com
Published online: 8 December 2007
DWBA analysis of the inelastic 30-40S(p,p') and 18-22O(p,p') scattering data measured in the inverse kinematics has been performed to determine the isoscalar (δ0) and isovector (δ1) deformation lengths of the 2+1 excitations in the Sulfur and Oxygen isotopes using a compact folding approach. A systematic N-dependence of δ0 and δ1 has been established which shows a link between δ1 and the neutron-shell closure. Strong isovector deformations were found in several cases, e.g., the 2+1 state in 20O where δ1 is nearly three times larger than δ0. These results confirm the relation δ1>δ0 anticipated from the core polarization by the valence neutrons in the open-shell (neutron rich) nuclei. The effect of neutron shell closure at N=14 or 16 has been discussed based on the folding model analysis of the inelastic 22O+p scattering data at 46.6 MeV/u measured recently at GANIL.
PACS: 25.40.Ep – – / 21.10.Re – – / 24.10.Eq – – / 24.10.Ht – –
© EDP Sciences, Springer-Verlag, 2007