Abstract
Local square-well and nonlocal separable potentials are used in the Dirac equation to show that the dominant relativistic effect in the deuteron matter radius r m comes from the coupling to the lower Dirac component in essentially the same way as the coupling to the D-state and higher-mass states in the Schrödinger equation. The resulting relativistic correction to r m turns out to be sensitive to dynamics. In the limit of weak binding, it gives a result in good agreement with the traditional kinematical approach for both local and nonlocal potentials.
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