Elsevier

Nuclear Physics A

Volume 427, Issue 3, 15 October 1984, Pages 589-613
Nuclear Physics A

A global optical potential analysis of 16O + 28Si elastic scattering

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Abstract

The differential cross sections for 16O + 28Si elastic scattering at many energies between 18 and 35 MeV in the center of mass are described very well over the whole angular range up to 180° by two optical potentials. One describes the data at twelve energies between 18 and 29 MeV and another one at two energies, 31.6 and 34.8 MeV. The two potentials differ in parameter values, but in both cases the real part consists of a folded potential supplemented in the surface with a double-peaked and energy-independent attractive correction which is parametrized as the derivatives of two Woods-Saxon form factors. The imaginary potential is a sum of Woods-Saxon volume and surface terms, and its radius increases linearly with energy. The excitation function for elastic scattering at 180° is also reproduced well up to about 32 MeV. The S-matrix elements generated by these potentials do not show any resonance features. The qualitative features of the scattering are discussed, especially in terms of the decomposition of the scattering amplitude into inner-wave and barrier-wave components.

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      Several ad hoc models have been proposed to explain the experimental data, but no satisfactory microscopic models have been put forward yet. The most satisfactory explanation proposed so far is that of Kobos and Satchler [6] who attempted to fit only the elastic scattering data with a microscopic double-folding potential. However, these authors had to use some small additional ad hoc potentials, which create a deepening in the surface region of the potential, to obtain a good agreement with the experimental data.

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    Research sponsored in part by the Division of Nuclear Physics, US Department of Energy, under contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

    ∗∗

    On leave from Institute of Nuclear Physics, Cracow, Poland.

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