IMPROVED D-4 POTENTIALS BY INVERSION - THE TENSOR FORCE AND VALIDITY OF THE DOUBLE FOLDING MODEL(HE)

Improved potential solutions are presented for the inverse scattering problem for d+He-4 data. The input for the inversions includes both th e data of recent phase shift analyses and phase shifts from RGM couple d-channel calculations based on the NN Minnesota force. The combined c alculations provide a more reliable estimate of the odd-even splitting of the potentials than previously found, suggesting a rather moderate role for this splitting in deuteron-nucleus scattering generally. The approximate parity-independence of the deuteron optical potentials is shown to arise from the nontrivial interference between antisymmetriz ation and channel coupling to the deuteron breakup channels. A further comparison of the empirical potentials established here and the doubl e folding potential derived from the M3Y effective NN force (with the appropriate normalization factor) reveals strong similarities. This re sult supports the application of the double folding model, combined wi th a small Majorana component, to the description even of such a loose ly bound projectile as the deuteron. In turn, support is given for the application of iterative-perturbative inversion in combination with t he double folding model to study fine details of the nucleus-nucleus p otential. A d-He-4 tensor potential is also derived to reproduce corre ctly the negative Li-6 quadrupole moment and the D-state asymptotic co nstant. [S0556-2813(98)03905-3].