Abstract
The effects of using soft-core potentials in nuclear matter are investigated by the Moszkowski-Scott separation method using free-particle energies in intermediate states. Changes in the binding energy per particle are estimated relative to the Yale potential which has a binding energy of only 8 MeV/ A. In the 1S 0 state the binding energy increases by 0.6 to 0.9 MeV if the hard core is replaced by the soft core in such a way that the resulting potentials have essentially the same phase shifts, and by another 2 to 2.5 MeV if the potential is made to fit the Livermore phase shifts. An additional 1 MeV may appear because the soft-core potential needs a weaker quadratic spin-orbit term, at least in the singlet-even states. The situation in the other states is discussed briefly and problems connected with the fit to the 3S 1 phase shifts and the strength of the tensor force are pointed out.
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