Abstract
The paper proposes that the isospin-independent part of the strong nuclear force is due to a two-component local potential: an attractive Lorentz-invariant scalar part and a repulsive four-vector part. Such a potential leads to energy dependence in the shape, volume integral, and rms radius of the real central optical potential of a nucleus. The volume integral diminishes linearly as 1/γ diminishes, γ being the Lorentz γ-factor of the incident nucleon; and the integral becomes repulsive above 200 MeV. The paper examines published results of empirical optical-model fits and shows that the trends in the data support the 1/γ dependence. An unorthodox fit by Elton at 180 MeV supports the model's apostrophe and predictions.
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