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Elastic scattering observables (differential cross section and analyzingpower) are calculated for the reaction $^6$He(p,p)$^6$He at projectile energiesstarting at 71 MeV/nucleon. The optical potential needed to describe thereaction is based on a microscopic Watson first-order folding potential, whichexplicitly takes into account that the two neutrons outside the $^4$He-coreoccupy an open p-shell. The folding of the single-particle harmonic oscillatordensity matrix with the nucleon-nucleon t-matrix leads for this case to newterms not present in traditional folding optical potentials for closed shellnuclei. The effect of those new terms on the elastic scattering observables isinvestigated. Furthermore, the influence of an exponential tail of the p-shellwave functions on the scattering observables is studied, as well as thesensitivity of the observables to variations of matter and charge radius.Finally elastic scattering observables for the reaction $^8$He(p,p)$^8$He arepresented at selected projectile energies.

Open Shell Effects in a Microscopic Optical Potential for Elastic Scattering of $^{6(8)}$He