Does the 3Nforce have a hard core?

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Abstract
The meson-nucleon dynamics that generates the hard core of the RuhrPot two-nucleon interaction is shown to vanish in the irreducible 3N force. This result indicates a small 3N force dominated by conventional light meson-exchange dynamics and holds for an arbitrary meson-theoretic Lagrangian. The resulting RuhrPot 3N force is defined in the Appendix. A completely different result is expected when the Tamm-Dancoff–Bloch-Horowitz procedure is used to define the NN and 3N potentials. In that approach (e.g., full Bonn potential), both the NN and 3N potentials contain nonvanishing contributions from the coherent sum of meson-recoil dynamics and the possibility of a large hard core requiring explicit calculation cannot be ruled out. © 1996 The American Physical Society.
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