Microscopic analysis of K+-nucleus elastic scattering based on K+N phase shifts

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We investigate K⁺-nucleus elastic scattering at intermediate energies within a microscopic optical model approach. To this effect we use the current K⁺-nucleon (KN) phase shifts from the Center for Nuclear Studies of the George Washington University as primary input. First, the KN phase shifts are used to generate Gel'fand-Levitan-Marchenko real and local inversion potentials. Secondly, these potentials are supplemented with a short range complex separable term in such a way that the corresponding unitary and non-unitary KN S matrices are exactly reproduced. These KN potentials allow to calculate all needed on- and off-shell contributions of the t matrix,the driving effective interaction in the full-folding K⁺-nucleus optical model potentials reported here. Elastic scattering of positive kaons from ⁶Li, ¹²C, ²⁸Si and ⁴⁰Ca are studied at beam momenta in the range 400-1000 MeV/c, leading to a fair description of most differential and total cross section data. To complete the analysis the full-folding model, three kinds of simpler tρ calculations are considered and results discussed. We conclude that conventional medium effects, in conjunction with a proper representation of the basic KN interaction are essential for the description of K⁺-nucleus phenomena.