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A simple superfluid model with an effective four body interaction of monopolepairing type is used to explain the staggering of the charge radii in theisotope chains. The contribution of deformation and of the particle numberprojection are analyzed for the Sn isotopes. Good results are obtained for thestaggering parameters and neutron pairing energies.Comment: RevTex, 19 pages and 4 postscript figures uuencoded and attached. To  appear in Phys. Rev.

Staggering of the nuclear charge radii in a superfluid model with good particle number