Khouaja, A., Villari, A. C. C., Benjelloun, M., Auger, G., Baiborodin, D., Catford, W., Chartier, M., Demonchy, C. E., Dlouhy, Z., Gillibert, A., Giot, L., Hirata, D., Lépine-Szily, A., Mittig, W., Orr, N., Penionzhkevich, Y., Pitae, S., Roussel-Chomaz, P., Saint-Laurent, M. G., and Savajols, H.
Energy integrated reaction cross-section measurements of around sixty neutron-rich nuclei covering the region of closed shells N = 20 and N = 28 were performed at intermediate energy (30-65 A . MeV) using direct method. In this experiment, silicon detectors were used as active targets. The reduced strong absorption radii, r02, for 19 new nuclei (27F, 27,30Ne, 33Na, 28, 34-35Mg, 36-38Al, 38-40Si, 41-42P, 42-44S and 45Cl) are deduced for the first time. An additional 60 radii, also measured in this experiment, are compared to results from literature. A new quadratic parametrization is proposed for the nuclear radius as a function of the isospin in the region of closed shells N = 8 and N = 28. According to this parametrization, the skin effect is well reproduced and anomalous behaviour on the radii are observed in 23N, 29Ne, 33Na, 35Mg, 44S, 45Cl and 45Ar nuclei. [ABSTRACT FROM AUTHOR]