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The interaction cross sections (₈) of ^ANa isotopes (A0ex{0ex}=0ex{0ex}20--23, 25--32) on a carbon target have been measured at 950AMeV. The effective root-mean-square matter radii of these isotopes were deduced from ₈ by a Glauber-type calculation. By combining the isotope-shift data with the present data the radii of neutrons have been compared with those of protons for the first time along a chain of stable and unstable isotopes. A monotonic increase in the neutron skin thickness has been observed as the neutron number increases in Na isotopes.
Suzuki et al. (Mon,) studied this question.