On the determination of nuclear parameters on the basis of the diffraction model

Experimental data on the elastic scattering of 156 MeV protons as well as 217 MeV He3, 104 MeV and 166 MeV α-particles by nuclei are analyzed by means of a five-parameter diffraction model. The average values obtained from such an analysis for the radii of strong absorption of different nuclei R are described with good accuracy by the expression R=r(Asub(1)sup(1/3)+Asub(2)sup(1/3)), where Asub(1) and Asub(2) are mass number of the target nucleus and the incident particle (for protons Asub(2)=0). Under these conditions the values found for the nuclear radii (except for light-weight nuclei) are within a narrow interval of 1.25<r0<1.33. The diffraction model also permits reliable values to be obtained for the widths of the nuclear surface diffusion. The advantages of the diffraction model are discussed and compared with the optical model