73 research outputs found

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

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    We investigate K+K^{+}-nucleus elastic scattering at intermediate energies within a microscopic optical model approach. To this effect we use the current K+K^{+}-nucleon {\it (KN)} phase shifts from the Center for Nuclear Studies of the George Washington University as primary input. First, the {\it 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 {\it KN} SS matrices are exactly reproduced. These {\it KN} potentials allow to calculate all needed on- and off-shell contributions of the tt matrix,the driving effective interaction in the full-folding K+K^{+}-nucleus optical model potentials reported here. Elastic scattering of positive kaons from 6^{6}Li, 12^{12}C, 28^{28}Si and 40^{40}Ca are studied at beam momenta in the range 400-1000 MeV/{cc}, 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 tρt\rho calculations are considered and results discussed. We conclude that conventional medium effects, in conjunction with a proper representation of the basic {\it KN} interaction are essential for the description of K+K^{+}-nucleus phenomena.Comment: 11 pages, 1 table, 12 figures, submitted to PR