Abstract
The strength distributions of particle-hole isoscalar transitions with high multipolarities are considered in the framework of the independent particle model using the Woods-Saxon potential. It is shown that for the multipole operatorsjL(qr)YLM withL≫A1/3 andq≲pF the distributions are peaked at the relatively low energy for allL, and their widths decrease asL−1/2. In contrast to that, for the surface external fields (∂U/∂r)YLM the centroid excitation energy is proportional toL2 and the distribution widths increase asL4/3. The conclusion is drawn that the p-h excitations might be responsible for the structures in the excitation function observed in heavy ion collisions in the energy region up to ≈2eF.
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