Abstract
Changes in the nuclear density arising from shape fluctuations are calculated in the case of the closed-shell nucleus /sup 40/Ca. The main contributions come from self-energy processes which renormalize the single-particle potential. Those due to ground-state correlations are much smaller. Processes involving the coupling to isoscalar vibrations are the most important, the role of isovector modes being small. Changes in the radius and in the diffusivity, of the order of 5% and 20%, respectively, are found.
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