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Improved potential solutions are presented for the inverse scattering problem for d+ 4 He data. The input for the inversions includes both the data of recent phase shift analyses and phase shifts from RGM coupled-channel calculations based on the NN Minnesota force. The combined calculations 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 antisymmetrization and channel coupling to the deuteron breakup channels. A further comparison of the empirical potentials established here and the double folding potential derived from the M3Y effective NN force (with the appropriate normalisation factor) reveals strong similarities. This result supports the application of the double folding model, combined with a small Majorana component, to the description even of such a loosely bound projectile as the deuteron. In turn, support is given for the application of iterativeperturbative inversion in combination with the double folding model to study fine details of the nucleus-nucleus potential. A d-4 He tensor potential is also derived to reproduce correctly the negative 6 Li quadrupole moment and the D-state asymptotic constant. 25.45.De,24.10.-i,21.60.Gx,24.75.+i Typeset using REVT E X 1 Contents of the paper. 1. Introduction 2. The role of parity dependence in IP inversion 3. Stabilised inversion of the d-4 He empirical data for 0 < E d ≤15 MeV 4. Inversion of RGM S(l) with breakup channel contributions 5. Validity of double folding model for d-4 He interaction and similar systems. 6. Tensor d-4 He potential and the 6 Li-quadrupole moment. Conclusions I. INTRODUCTIONMany basic features of the interactions between light composite particle are now well established. In particular, a good description [1]-[6], of the interactions of light nuclei such as d + t, t+ 3 He, 4 He+ 4 He etc. is obtained from a deep attractive potential with Pauliforbidden states with the addition of parity dependence, Young scheme splitting and a spinorbit interaction. Importantly, this type of interaction is now justified from microscopic considerations, both in quasi-classic picture [4] and also in quantum mechanical shell-model framework [1,7]. These results lead to a general comprehensive understanding of the relations between various interaction models which appear, at a first glance, to contradict to each other.Nevertheless, a number of finer features of the interaction, notably the role of the dynamic polarisation of loosely bound projectiles such as d or 6,7 Li when combined with antisymmetrization effects, are not yet fully understood despite many previous efforts. The existing problems and contradictions are illustrated by the following example. On the one hand, it is well known (see e.g. [1], [8]- [13]) that antisymmetrization and coupled-channel effects in composite parti...

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By way of evaluating a new procedure for energy-dependent inversion we have compared the energy dependence of the local potential phase equivalent to the Perey-Buck non-local potential with the energy dependence of local potentials derived from RGM and phenomenology.