Abstract
The contribution from a three-body force with an intermediate N ∗(1470) state has been calculated both in nuclear matter and a finite nucleus ( 16O). Since the N ∗ resonance has spin = isospin = 1 2 the lowest order three-body term yields a non-zero contribution. This point is different from the case of the three-body force with a Δ-isobar intermediate state, since the latter vanishes in the lowest order for nuclei with isospin = 0 due to isospin conservation. In order to take into account nucleon-nucleon (NN) correlations, we have employed an effective transition potential G ̃ between NN and NN ∗. The resulting contributions are 1.19 MeV/ A and 0.41 MeV/ A attraction for nuclear matter and 16O, respectively. The Pauli effect on the two-body potential has also been considered. It gives 0.29 MeV/ A and 0.11 MeV/ A repulsion for nuclear matter and 16O, respectively.
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