MEASUREMENT OF INTERACTION CROSS-SECTIONS FOR NEUTRON-RICH Na ISOTOPES.

The interaction cross-sections (σ_I) of neutron-rich Na isotopes, ^23-35Na, on C target have been measured at 250A MeV using the RI beam factory (RIBF) at RIKEN. Mass dependence of σ_I for ^27-35Na suggests monotonic growth of the skin thickness. The root-mean-square nuclear matter radii (r̃_m) of ^23-35Na were deduced from observed σ_I via a Glauber-type calculation. These r̃_m are in a good agreement with the theoretical prediction by relativistic mean field model (RMF). r̃_m of ^33-35Na were determined for the first time. [ABSTRACT FROM AUTHOR]