The calculation and derivation of microscopic optical potentials for calculating scattering observables for elastic scattering from spin-zero nuclei has a long tradition. So-called microscopic `full-folding' models based on a nuclear density matrix and a fully-off-shell two-nucleon t-matrix have been developed mainly for closed shell nuclei heavier than 16O. Constructing microscopic optical potential for the 6He isotope poses a twofold challenge: First, 6He is a loosely bound nucleus consisting of an alpha core and two valence neutrons. Second, 6He as well as 8He are not closed-shell nuclei.
To address the first challenge, an optical potential based on the Watson first-order multiple-scattering ansatz is extended to accommodate the internal dynamics of a cluster model for the 6He nucleus. Differential cross sections and analyzing powers are calculated and discussed for a set of energies, including 71 MeV/nucleon. In addressing the second challenge, the Watson optical potential has been extended to incorporate the open-shell structure of 6He and 8He. Both those effects on the differential cross section and the polarization are discussed.
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