73 research outputs found
Microscopic analysis of K^+-nucleus elastic scattering based on K^+N phase shifts
We investigate -nucleus elastic scattering at intermediate energies
within a microscopic optical model approach. To this effect we use the current
-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} matrices are exactly reproduced. These {\it KN}
potentials allow to calculate all needed on- and off-shell contributions of the
matrix,the driving effective interaction in the full-folding
-nucleus optical model potentials reported here. Elastic scattering of
positive kaons from Li, C, Si and Ca are studied at
beam momenta in the range 400-1000 MeV/{}, 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 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 -nucleus phenomena.Comment: 11 pages, 1 table, 12 figures, submitted to PR
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