Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-12-19
Eur.Phys.J.ST150:31-34,2007
Physics
Nuclear Physics
Nuclear Theory
Talk given at RNB7 conference (Cortina d'Ampezzo, Italy, July 3-7, 2006); 4 pages, 4 figures, to appear in Eur. Phys. Journal
Scientific paper
10.1140/epjst/e2007-00258-8
DWBA analysis of the inelastic $^{30-40}$S$(p,p')$ and $^{18-22}$O$(p,p')$ scattering data measured in the inverse kinematics has been performed to determine the isoscalar ($\delta_0$) and isovector ($\delta_1$) deformation lengths of the 2$^+_1$ excitations in the Sulfur and Oxygen isotopes using a compact folding approach. A systematic $N$-dependence of $\delta_0$ and $\delta_1$ has been established which shows a link between $\delta_1$ and the neutron-shell closure. Strong isovector deformations were found in several cases, e.g., the 2$^+_1$ state in $^{20}$O where $\delta_1$ is nearly three times larger than $\delta_0$. These results confirm the relation $\delta_1>\delta_0$ 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 $^{22}$O+$p$ scattering data at 46.6 MeV/u measured recently at GANIL.
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