Effect of Hard Cores on the Binding Energies of H^3 and He^3, II

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Theoretically calculated binding energies of H^3 and He^3 were reported in our preceding paper, I, where two-body forces of exponential type with hard core cut-offs were assumed. In the present paper we show the results of similar calculations with two-body forces of the Yukawa type which are cut off by hard cores. Only central forces are used and the force parameters are determined from the two-nucleon data at low energies as was done in the preceding paper. This change in the radial form of the nuclear force does not alter the qualitative features of the effects of hard cores : i.e.1)Hard cores reduce the binding energies of H^3 and He^3. 2)Hard cores push out the wave functions of H^3 and He^3, so that the Coulomb energy of He^3, which is too large without the hard cores, is brought into agreement with the experimental value of the difference between the binding energies of H^3 and He^3.
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