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The effective neutron and proton root-meansquare radius of stable and unstable nuclei(~(12-15,17)B,~(12-20)C,~(14-21)N,~(16-24)O and ~(18-21,23-26)F) were deduced from the charge-changing cross section,σ_(cc),and the interaction cross sections,σ_I,by usin