Abstract
Data on the isotope shift of the nuclear charge densities of the tin isotopes and of their mean square charge radii are considered from the viewpoint of the Hartree-Fock and Droplet Models. Attention is paid to the electromagnetic corrections of order 1/m2. Through a leptodermous analysis of charge and matter densities we find: (i) differences of m.s. charge radii are mainly sensitive to the external region, (ii) the electromagnetic corrections are important in that region, (iii) despite different leptodermous properties, forces Ska and GO-P lead to the same neutron skin thickness. The average rate of variation of the proton m.s. radius is interpreted as favouring either a low valueQ≈30 MeV for the droplet model asymmetry parameter, or a zero value for the saturation asymmetry parameterL.
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Three of the authors are grateful to NSERC for continuing research support under operating grant A-3198. We thank Dr. F. Buchinger for critical comments. One of us (DB), further acknowledges helpful discussions with Drs. Hasse and Ulm, and thanks Dr. Roeckl and Prof. Huber for their interest in this work.