Variational Monte Carlo calculations for the ground-and excited-state binding energies of s-shell hypernuclei using a new form of dispersive spin-dependent noncentral ⌳NN force have been made to study its effect on the overbinding problem of ⌳ 5 He and on the spin dependence of ⌳N force. A detailed analysis shows that the strength of the dispersive ⌳NN force can be adjusted to resolve the overbinding problem using two-body correlations alone. Consequently, the ambiguity in the strength of the dispersive ⌳NN force masks the effect of 2-exchange ⌳NN force and ⌳NN correlations on the data. The contribution of the dispersive force to the 0 ϩ -1 ϩ spin-flip splitting of Aϭ4 hypernuclei is not uniquely determined. Further B ⌳ data favor a small spin dependence of the ⌳N potential, a situation characteristically similar to other versions of dispersive ⌳NN potentials.
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