Abstract
The cross section for a quasi-elastic process is calculated from the expression of the elastic scattering amplitude obtained in diffraction theory. The radius of the nuclear interaction is assumed to depend linearly on the isospins of the interacting nuclei. The comparison between the predicted quasi-elastic angular distribution and the parent elastic distribution shows that the decay of the pattern of the latter is sharper than that of the former and that both patterns oscillate with the same period but in opposite phases. The angular distribution obtained in the quasi-elastic case is in satisfactory agreement with the experimental data. The effect of the presence of an open quasi-elastic channel on the elastic scattering cross section is investigated; it is found to be small especially in the forward scattering hemisphere.
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