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

We investigate ${K}^{+}$-nucleus elastic scattering at intermediate energies within a microscopic optical model approach using the current ${K}^{+}$-nucleon (KN) phase shifts from the Center for Nuclear Studies of the George Washington University as primary input. The KN phase shifts are used to generate Gel'fand-Levitan-Marchenko real and local inversion potentials. These potentials are supplemented with a short-range, complex separable term in such a way that the corresponding unitary and nonunitary $\mathit{KN S}$ matrices are exactly reproduced. These KN potentials allow us 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 $^{6}\mathrm{Li}$, $^{12}\mathrm{C}$, $^{28}\mathrm{Si}$, and $^{40}\mathrm{Ca}$ are studied at beam momenta in the range 400\char21{}1000 MeV/c, leading to a fair description of most differential and total cross section data. To complete the analysis of the full-folding model, three kinds of simpler $t\ensuremath{\rho}$ calculations are considered and the results are discussed.