Abstract

This chapter discusses the important effects resulting from finite nuclear size. There are two distinct effects due to finite nuclear size: (1) static and (2) dynamic. The static effect relates to the modification of the electron wave functions, particularly close to the nucleus. The dynamic effect arises from the fact that the electron does actually penetrate the nucleus some of the time. The most comprehensive calculation of internal conversion coefficients (ICCs) includes nuclear size and screening effects. The static effect of nuclear size on the ICCs is taken into account in a very simple fashion, giving results in excellent agreement with other more sophisticated approaches. At present, there is a better understanding of the effects of screening on the ICCs at different transition energies.

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