The interaction cross sections (σI) of ANa isotopes (A0ex0ex=0ex0ex20--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 σI 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.
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Suzuki et al. (1995) studied this question.
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