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

Abstract

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 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 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 of the full-folding model, three kinds of simpler tρ calculations are considered and the results are discussed.