Optical Model in the Interior of the Nucleus

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Abstract
It is shown how phase relationships between partial waves in the optical model result in focusing effects which are largest for surface partial waves. In the case of very low incident energies where the wavelength of a partial wave is large compared to the nuclear surface thickness, it is shown how the phase relationships may enable surface- and volume-reaction mechanisms for a direct reaction to be distinguished by looking at gross features of the angular distribution. Thus, low-energy direct interactions may be used as a probe for the nuclear interior.