Abstract
It is well known that atomic nuclei show collective properties. One important aspect of collective motion is the concentration in energy of excitation strength. This is best illustrated by the nuclear photo effect [1] which has the following two main characteristics: i) the photoabsorption cross-section shows, all over the periodic table, a broad peak that takes a large part of the integrated photo cross-section; ii) the variation of the peak energy is a smooth function of the mass number A. Two main routes can be followed in order to describe such a behavior; 1) the more detailed, in which the strength function S(E) is calculated at all energies E, 2) a more global in which only some energy moments of the strength function S(E) are computed.
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