Reaction cross-sections and reduced strong absorption radii of nuclei in the vicinity of closed shells N=20 and N=28

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.; Lepine-Szily, A.; Mittig, W.; Orr, N.; Penionzhkevich, Y.; Pitae, S.; Roussel-Chomaz, P.; Saint-Laurent, M. G. and Savajols, H. (2005). Reaction cross-sections and reduced strong absorption radii of nuclei in the vicinity of closed shells N=20 and N=28. European Physical Journal A - Hadrons and Nuclei, 25(Suppl.1) pp. 223–226.

DOI: https://doi.org/10.1140/epjad/i2005-06-185-x

Abstract

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.

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