Abstract
Differential cross sections for the elastic scattering of 9.65, 7.37 and 5.66 MeV/amu oxygen ions from a gaseous oxygen target have been measured over a range of laboratory angles from about 2° to 11°, with a relative precision of 4% and an estimated absolite precision (at 9.65 MeV/amu only) of 15%. Using a simple diffraction model and a nuclear radius of 1.34 A 1 3 fm = 3.37 fm , a good fit was obtained the maxima and minima of the angular distributions. In addition, this analysis gave qualitative agreement with the absolute magnitude of the measured cross section at 9.65 MeV/amu. Attempts to fit the data with a sharp cutoff model were not as succesful. By modifying this model with an imaginary nuclear phase shift to produce a diffuse cutoff, the agreement was somewhat improved. Linear and exponential shapes for the edge of the nuclear surface were equally satisfactory, and resulted in cutoff radius parameters which were larger than that obtained from the diffraction analysis and which increased with decreasing energy. The radial diffuseness parameters ΔR obtained from these calculations ranged from 0.51 fm at 9.65 MeV/amu to 0.23 fm at 5.66 MeV/amu, in reasonable agreement with those obtained from optical model calculations.
Published Version
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